Re: [Emc-users] PCB circuit board drill file, useful format

[Nicklas Karlsson]

> Excellon drill files are a very old variant of RS-274D.  
> They use suppressed decimal points and suppressed trailing 
> decimals.  So, no way will LinuxCNC read them as is.  So, if 
> the format is 2.3, then an X coordinate of 1.2345 will be 
> X01234, and a coordinate of 1.2 will be X012.
> 
> But, it is simple to write a program that reparses this stuff.
> 
> Jon

Already found more than one program to reparse the Excellon drill files. For me 
it feels like a rather useful fileformat: a list drill sizes and a list of 
coordinates for each drill size. Parameters for drilling like feed rate and 
others are postponed to later stage.


Nicklas Karlsson

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Re: [Emc-users] PCB circuit board drill file

[Nicklas Karlsson]

> On 04/25/2016 11:56 AM, Nicklas Karlsson wrote:
> > I am looking at using linuxcnc to drill my circuit boards. There is a few 
> > commands in file, a tool table and coordinates. It is not possible run the 
> > file directly in linuxcnc. I think this kind of file could be of general 
> > use then a pattern of holes need to be drilled. Do anyone have any 
> > suggestions on how to attack it?

I could in sort of see g-code in the excellon drill files but linuxcnc where 
not able to read. I also assumed many used Excellon drill files before. It 
useful both for circuit boards and picking coordinates for heat sink.

> Although Excellon drill files are technically a dialect of 
> RS-274D (alias G-code) they are pretty far from modern 
> dialects.  I wrote a program to convert it to standard 
> G-code.  See :
> http://pico-systems.com/codes/cvtexc2.c
> and
> http://pico-systems.com/codes/cvtexcm.c
> 
> The first one assumes input AND output are in inch units, 
> the 2nd one takes mm in and converts to inches.
> 
> It has been a LONG time since I used these, so definitely 
> use at YOUR PERIL!
> 
> Probably the first program will work fine reading in mm and 
> outputting mm if you just adjust where the assumed decimal 
> point is.  The code should be pretty transparent if you know c.
> 
> Jon
> 
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Re: [Emc-users] PCB circuit board drill file

[Jon Elson]

On 04/25/2016 12:15 PM, andy pugh wrote:
> On 25 April 2016 at 17:56, Nicklas Karlsson
>  wrote:
>> Do anyone have any suggestions on how to attack it?
> An input filter than replaces Tn with
>
> M6 Tn
> G81 F50 R0.5 Z-3
>
> Then the X Y coordinate pairs will drill holes.
>
Excellon drill files are a very old variant of RS-274D.  
They use suppressed decimal points and suppressed trailing 
decimals.  So, no way will LinuxCNC read them as is.  So, if 
the format is 2.3, then an X coordinate of 1.2345 will be 
X01234, and a coordinate of 1.2 will be X012.

But, it is simple to write a program that reparses this stuff.

Jon

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Re: [Emc-users] PCB circuit board drill file

[Jon Elson]

On 04/25/2016 11:56 AM, Nicklas Karlsson wrote:
> I am looking at using linuxcnc to drill my circuit boards. There is a few 
> commands in file, a tool table and coordinates. It is not possible run the 
> file directly in linuxcnc. I think this kind of file could be of general use 
> then a pattern of holes need to be drilled. Do anyone have any suggestions on 
> how to attack it?
Although Excellon drill files are technically a dialect of 
RS-274D (alias G-code) they are pretty far from modern 
dialects.  I wrote a program to convert it to standard 
G-code.  See :
http://pico-systems.com/codes/cvtexc2.c
and
http://pico-systems.com/codes/cvtexcm.c

The first one assumes input AND output are in inch units, 
the 2nd one takes mm in and converts to inches.

It has been a LONG time since I used these, so definitely 
use at YOUR PERIL!

Probably the first program will work fine reading in mm and 
outputting mm if you just adjust where the assumed decimal 
point is.  The code should be pretty transparent if you know c.

Jon

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Re: [Emc-users] Lubrication

[Dave Cole]

On 4/25/2016 12:03 PM, andy pugh wrote:
> On 25 April 2016 at 16:34, Dave Cole  wrote:
>> Don't over look grease also. Pressurized oil is probably the best,
>> however a lot of machines simply have zerk fittings to grease slides.
> A lot of those "zerk" fittins are actually for oil.
>
> When buying a second-hand machine tool it is often necessary to
> dismantle it to clean the grease out of the oil nipples. (and hope
> that not too much damage has happened since it was done)
>
> http://www.lathespares.co.uk/oil-gun-myford-lathe-1


That's an interesting tool.I have a similar tool that is meant to be 
filled with oil or kerosene and you place it on the zerk fitting and you 
tap it with a hammer.  The force from the hammer
drives the oil into the zerk and blows out whatever is plugging it up.   
It works well and is good for old car and truck suspension fittings that 
have been clogged with rust and dirt.

Dave

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Re: [Emc-users] Metals question

[Gene Heskett]

On Monday 25 April 2016 15:34:05 andy pugh wrote:

> On 25 April 2016 at 18:48, Gene Heskett  wrote:
> > What sort of an encoder is hidden under it?
>
> That iteration was a slotted aluminium disc using reflective sensors.
> It was later replaced by a gear-driven conventional encoder inside the
> headstock casting.

I see.  I've been using home-made slotted disks, with slot type 
interrupters doing the heavy lifting on the A/B/X lines. 

Thanks Andy.

Cheers, Gene Heskett
-- 
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-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] JT for president

[John Thornton]

We still have one swamp left... it took man two ginormous tries to drain 
the swamps but one place could not be drained so it still has 
prehistoric fish swimming it it...

JT

On 4/25/2016 11:32 AM, Gene Heskett wrote:
> On Monday 25 April 2016 07:41:45 John Thornton wrote:
>
>> Actually that is Swamp East Missouri :)
>>
>> JT
>>
> Minor detail John, its only another thousand miles. :)
>
>> On 4/25/2016 4:16 AM, W. Martinjak wrote:
>>> The 7i90HD needs just 10 Days from the swamps in Michigan to the
>>> valleys in the Alps. Best service ever.
>>>
>>> Thanks JT!
>>>
>>> BR matsche
>> --
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>> free trial!
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>
> Cheers, Gene Heskett


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Re: [Emc-users] Metals question

[andy pugh]

On 25 April 2016 at 18:48, Gene Heskett  wrote:
> What sort of an encoder is hidden under it?

That iteration was a slotted aluminium disc using reflective sensors.
It was later replaced by a gear-driven conventional encoder inside the
headstock casting.

-- 
atp
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
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Re: [Emc-users] PCB circuit board drill file

[Bengt Sjölund]

If you have proper EXCELLON drillfile format cut and paste that code in 
left column, after that see to it that you have correct input parameters 
for the EXCELLON file and then GENERATE G-CODE.

There are NO C chars in the generated G-code

/Bengt

Den 2016-04-25 kl. 20:11, skrev Nicklas Karlsson:
> On Mon, 25 Apr 2016 19:58:47 +0200
> Bengt Sjölund  wrote:
>
>> http://eng-serve.com/cnc/excellon_gcode.html
> Tried it and linuxcnc make complain about the "C" character on the first T 
> line.
>
> I have been able to build my own CNC machine but this is the first time I use 
> g-code. I simply can't find what C character on the T line should do.
>
>
> Regards Nicklas Karlsson
>
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Re: [Emc-users] PCB circuit board drill file, got it

[Nicklas Karlsson]

Didn't read carefully enough, got it now.

On Mon, 25 Apr 2016 19:58:47 +0200
Bengt Sjölund  wrote:

> http://eng-serve.com/cnc/excellon_gcode.html
> 
> Den 2016-04-25 kl. 19:54, skrev Nicklas Karlsson:
> > I get problem with tool table setup. I have to comment out "INCH" and are 
> > not able to figure out the T commandd.
> >
> > M48
> > INCH
> > T73 C0.020
> > T72 C0.058
> > T71 C0.030
> > T70 C0.210
> > T69 C0.036
> > T68 C0.050
> > T67 C0.038
> > T66 C0.040
> > T65 C0.068
> >
> >
> >> On 25 April 2016 at 17:56, Nicklas Karlsson
> >>  wrote:
> >>> Do anyone have any suggestions on how to attack it?
> >> An input filter than replaces Tn with
> >>
> >> M6 Tn
> >> G81 F50 R0.5 Z-3
> >>
> >> Then the X Y coordinate pairs will drill holes.
> >>
> >> -- 
> >> atp
> >> "A motorcycle is a bicycle with a pandemonium attachment and is
> >> designed for the especial use of mechanical geniuses, daredevils and
> >> lunatics."
> >> — George Fitch, Atlanta Constitution Newspaper, 1916
> >>
> >> --
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> >> your business applications. It resolves application problems quickly and
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> >
> 
> 
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Re: [Emc-users] PCB circuit board drill file

[Nicklas Karlsson]

On Mon, 25 Apr 2016 19:58:47 +0200
Bengt Sjölund  wrote:

> http://eng-serve.com/cnc/excellon_gcode.html

Tried it and linuxcnc make complain about the "C" character on the first T line.

I have been able to build my own CNC machine but this is the first time I use 
g-code. I simply can't find what C character on the T line should do.


Regards Nicklas Karlsson

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Re: [Emc-users] PCB circuit board drill file

[Bengt Sjölund]

http://eng-serve.com/cnc/excellon_gcode.html

Den 2016-04-25 kl. 19:54, skrev Nicklas Karlsson:
> I get problem with tool table setup. I have to comment out "INCH" and are not 
> able to figure out the T commandd.
>
> M48
> INCH
> T73 C0.020
> T72 C0.058
> T71 C0.030
> T70 C0.210
> T69 C0.036
> T68 C0.050
> T67 C0.038
> T66 C0.040
> T65 C0.068
>
>
>> On 25 April 2016 at 17:56, Nicklas Karlsson
>>  wrote:
>>> Do anyone have any suggestions on how to attack it?
>> An input filter than replaces Tn with
>>
>> M6 Tn
>> G81 F50 R0.5 Z-3
>>
>> Then the X Y coordinate pairs will drill holes.
>>
>> -- 
>> atp
>> "A motorcycle is a bicycle with a pandemonium attachment and is
>> designed for the especial use of mechanical geniuses, daredevils and
>> lunatics."
>> — George Fitch, Atlanta Constitution Newspaper, 1916
>>
>> --
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>> of
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>


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Re: [Emc-users] PCB circuit board drill file

[Nicklas Karlsson]

I get problem with tool table setup. I have to comment out "INCH" and are not 
able to figure out the T commandd.

M48
INCH
T73 C0.020
T72 C0.058
T71 C0.030
T70 C0.210
T69 C0.036
T68 C0.050
T67 C0.038
T66 C0.040
T65 C0.068


> On 25 April 2016 at 17:56, Nicklas Karlsson
>  wrote:
> > Do anyone have any suggestions on how to attack it?
> 
> An input filter than replaces Tn with
> 
> M6 Tn
> G81 F50 R0.5 Z-3
> 
> Then the X Y coordinate pairs will drill holes.
> 
> -- 
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
> 
> --
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-- 
Nicklas Karlsson 

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Re: [Emc-users] PCB circuit board drill file

[Gene Heskett]

On Monday 25 April 2016 13:32:27 Nicklas Karlsson wrote:

> I could issue this G81 commands once and not for each coordinate?
>
Yes, see page 238 in the docs pdf where canned cycles are described.
>
> On Mon, 25 Apr 2016 18:15:24 +0100
>
> andy pugh  wrote:
> > On 25 April 2016 at 17:56, Nicklas Karlsson
> >
> >  wrote:
> > > Do anyone have any suggestions on how to attack it?
> >
> > An input filter than replaces Tn with
> >
> > M6 Tn
> > G81 F50 R0.5 Z-3
> >
> > Then the X Y coordinate pairs will drill holes.
> >
> > --
> > atp
> > "A motorcycle is a bicycle with a pandemonium attachment and is
> > designed for the especial use of mechanical geniuses, daredevils and
> > lunatics."
> > — George Fitch, Atlanta Constitution Newspaper, 1916
> >
> > 
> >-- Find and fix application performance issues faster with
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> > insights into multiple tiers of your business applications. It
> > resolves application problems quickly and reduces your MTTR. Get
> > your free trial!
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Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Metals question

[Gene Heskett]

On Monday 25 April 2016 13:19:13 andy pugh wrote:

> On 25 April 2016 at 18:03, Gene Heskett  wrote:
> > But at that diameter,
> > best done on the mill as the drive parts at that diameter would be
> > falling out in pieces as the 1 HP motor breaks them. BTDT, way too
> > many times already.
>
> My version of a drive system on my 9x lathe has been bullet-proof so
> far. I do sometimes miss having a back-gear option, though.
>
> Not a great photo, but I basically just put a big V-belt pulley on the
> spindle and let the VFD do the rest.
> https://picasaweb.google.com/108164504656404380542/CNCUnsorted#5437112
>986322828066

I have considered something along those lines but the treadmill motors 
pulley is part of the cooling fan/flywheel using a j size polygroove 
belt 5 ribs wide and I have been unable to locate, or make a big enough 
matching pulley to do that as I've been unable to find/buy a tool holder 
with the correct geometry to hold one of the very long v-chips in a 
position to carve it. All centered, side of tool holder is in the way 
when cutting the left most groove.

What sort of an encoder is hidden under it?

The treadmill motors can pull stumps without using any of Alfred N's 
Finest, so low speed grunt is generally not a problem, particularly 
since the jackshafts polygroove pulley is already a 3x speed stepdown.

But I think it would solve all my broken drive parts problems in one 
swell foop at the expense of losing the backgearing.  Its a bit puny 
anyway even with steel gears in it now-a-days.  One of the tool tipped 
over and locked the spindle in 5 degrees from 500 rpms incidents bent a 
backshaft.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] PCB circuit board drill file

[Nicklas Karlsson]

I could issue this G81 commands once and not for each coordinate?



On Mon, 25 Apr 2016 18:15:24 +0100
andy pugh  wrote:

> On 25 April 2016 at 17:56, Nicklas Karlsson
>  wrote:
> > Do anyone have any suggestions on how to attack it?
> 
> An input filter than replaces Tn with
> 
> M6 Tn
> G81 F50 R0.5 Z-3
> 
> Then the X Y coordinate pairs will drill holes.
> 
> -- 
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
> 
> --
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Re: [Emc-users] _camon.ngc

[Gene Heskett]

On Monday 25 April 2016 13:12:10 andy pugh wrote:

> On 25 April 2016 at 17:53, Gene Heskett  wrote:
> > Whats this Andy? Here, M4 is reverse spindle and I've not a clue
> > what the P5 means in this context.
> >
> >> M4 P5
>
> Sorry, was meant to be G5 so you had time to see the effect.

I think you meant G4 P5.  But I don't want it to return to the original 
co-ords at all on this button click, thats a separate button entirely.  
In fact the original co-ords are adjusted by whatever jogging you might 
do from the commanded offsets.

Thanks Andy,

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Metals question

[andy pugh]

On 25 April 2016 at 18:03, Gene Heskett  wrote:
> But at that diameter,
> best done on the mill as the drive parts at that diameter would be
> falling out in pieces as the 1 HP motor breaks them. BTDT, way too many
> times already.

My version of a drive system on my 9x lathe has been bullet-proof so
far. I do sometimes miss having a back-gear option, though.

Not a great photo, but I basically just put a big V-belt pulley on the
spindle and let the VFD do the rest.
https://picasaweb.google.com/108164504656404380542/CNCUnsorted#5437112986322828066

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] PCB circuit board drill file

[andy pugh]

On 25 April 2016 at 17:56, Nicklas Karlsson
 wrote:
> Do anyone have any suggestions on how to attack it?

An input filter than replaces Tn with

M6 Tn
G81 F50 R0.5 Z-3

Then the X Y coordinate pairs will drill holes.

-- 
atp
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
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Re: [Emc-users] _camon.ngc

[andy pugh]

On 25 April 2016 at 17:53, Gene Heskett  wrote:

> Whats this Andy? Here, M4 is reverse spindle and I've not a clue what the
> P5 means in this context.
>> M4 P5

Sorry, was meant to be G5 so you had time to see the effect.


-- 
atp
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] _camon.ngc

[andy pugh]

On 25 April 2016 at 18:12, andy pugh  wrote:

> Sorry, was meant to be G5 so you had time to see the effect.

G4, even.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] Metals question

[Gene Heskett]

On Monday 25 April 2016 12:33:11 andy pugh wrote:

> On 25 April 2016 at 17:22, Gene Heskett  wrote:
> >> On the Holbrook Minor I made a special casting:
> >> https://picasaweb.google.com/108164504656404380542/Holbrook#6237477
> >>947 128358578
> >
> > There, you did the opposite offset to what I have in mind, but again
> > the carriage has a wide enough footprint.
>
> It also has a solid tapered Gib.
> And the whole casting rotates on the original compound slide track, so
> I can put the offset to the other side if that turns out to be a
> better idea.
> (The offset is also to enable me to machine the biggest work that will
> swing, as there is not _quite_ enough travel on the axis with a
> ball-nut replacing the original bronze nut)

There is that as I too have an out limit about 20mm inward from the OEM 
lash up.  Moving the tool holder to the right and 1/2" outward would 
both be desireable moves.  Might need to use the old setup long enough 
to put a taper for chuck jaw clearance though. :)  But at that diameter, 
best done on the mill as the drive parts at that diameter would be 
falling out in pieces as the 1 HP motor breaks them. BTDT, way too many 
times already.

Thanks Andy.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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[Emc-users] PCB circuit board drill file

[Nicklas Karlsson]

I am looking at using linuxcnc to drill my circuit boards. There is a few 
commands in file, a tool table and coordinates. It is not possible run the file 
directly in linuxcnc. I think this kind of file could be of general use then a 
pattern of holes need to be drilled. Do anyone have any suggestions on how to 
attack it?

Tool table:
  M48
  INCH
  T73 ...
  T73 ...
  T73 ...
  ...

Coordinates for each tool:
  %
  T73
  X..Y..
  X..Y..
  X..Y..
  ...
  T71
  X..Y..
  X..Y..
  X..Y..
  ...


Regards Nicklas Karlsson

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Re: [Emc-users] _camon.ngc

[Gene Heskett]

On Monday 25 April 2016 12:17:09 andy pugh wrote:

> On 25 April 2016 at 17:05, Gene Heskett  wrote:
> > So I'm still missing something in my understanding. Why does the
> > machine immediately revert to where it started from?
>
> Do one, or the other, but not both...
>
> G43 H99 will apply the T99 offset, but not move the axis.
>
> So:
> (save the current position)
> #1 = #<_x>
> #2 = #<_y>
> G43 H99
> G0 X#1 Y#2
>
Whats this Andy? Here, M4 is reverse spindle and I've not a clue what the 
P5 means in this context.
> M4 P5
>
> (move back)

This should be a separate button click that runs this as _camoff.ngc?
> G43
> G0 X#2 Y#2

And make the above into 2 files as we want the moves to hold while we 
fine tune the position by jogging to record it?

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Learning LinuxCNC Installation Video

[Chris Albertson]

About audio recording.  As you've figured out audio quality is more
important than video quality.  Viewers will put up with some noise in
the video but  any audio defect really stand out.  The way to do this
is

1) Get a decent external, separate audio recording device.  The
cheapest is the "Zoom H1" recorder.   These actually have decent
built-in microphones but you might want a better model, see below.

2) If recording live sound, at the same time you take the video also
use the camcorder's built-in mic.  This camera audio is used ONLY to
sync the external audio. (It beats trying to use a clap board)

3) try NOT to record live sound.  Record a voice over AFTER you edit
the video.  The voice over cane be done using several "takes" and the
best of it splice together.  No one will see your mistakes.  Start
with your face on-camera to introduce the subject that cut to the
subject and do the voice later so most of your speaking is off camera.

4) I like to apply some EQ and quite a lot of compression to the voice
over track.  Makes you sound like a professional announcer who has
good control over his voice level.  You can use software EQ and
compression.  (real hardware is just to expensive and over kill)

5) place the microphone as close as you can.  For recording voice
overs in post production I use a dynamic microphone about 8 inches in
front of my mouth and a POP FILTER.  It's a simple/cheap screen that
keeps plosive air bursts off the microphone.   I like the Rode N1a for
this but a cheap Chinese mic like that s good now days   For on-camera
recording get a Lavalier microphone.and clip it to your shirt.   No
need to spend a lot of money.  Used AKG brand microphones are
available on eBay.   If shopping don't go to consumer electronics
store.  They sell expensive low quality.  Go to a place that sells to
musicians (Guitar Center or Sam Ash or Sweetwater)  Look for good used
stuff

6) pretty much the way to tell a decent mic from low-end mic is by
looking at the end of the cable.  Any quality microphone will have an
XLR connector.  They is a balanced differential signal

7) the lowest cost Zoom H1 recorder does not have XLR inputs, you have
to move up a little to get that.  But you need it or you will be
dealing with 60Hz hum

8) buy a pair of Sony MDR7506 headphones.  These are the industry
standard for monitoring field recordings.  If the sound seems OK with
these, its good.

9) If you need to get audio into your computer  you need an audio
interface.  of course you can use the Zoom recorder then simply move
the memory card to transfer the sound but if you want to record
directly to the computer you need an interface that (a) accepts XLR
connectors (b) provide "phantom power and (c) does not make much self
noise (hiss)  One good one is the Focusrite 2i2.  Another is Presonus
Audiobox.

OK if you want to go low budget. Just get the entry level "Zoom" and
always keep it as close as possible, just off frame if yu are speaking
on camera and 12" in front of your face if doing voice over in post
production. and do as much of the voice recording after you cut the
video as you can.  Next step up is the lavaliere mic and XLR based
recorder then add a studio condenser mic.   Some times you can hide an
H1 on the set (behind a coffee cup?) to get it even closer

That on-camera mic is for a sync track only, you can trash it later.
on the camera is always the WORST location for a microphone because it
is as far away as possible.

Next is to find a place where you can record that has decent
acoustics.  The no-cost solution might be a walk-in closet in an
upstairs bedroom.  Those studio mics pick up not only your voice but
your voice after it bounces off the walls.   That is one reason you
place it so close (maybe 8" in front of you)   With a dynamic stage
microphone you see the performers always holding it 1 to 3 inches
away, they want their voice to be much louder then all the noise going
on around them.  But a studio mic can be farther back (6 to 12 ")
because studios are quiet places.

As for buying stuff.  Make a plan for an upgrade path so you don't
replace stuff three times.You will find that with videos, the
video camera is the least important and lowest cost item.  It is
LIGHTS and SOUND that is that hard and expensive part.

Next you need software to put it all together.

On Mon, Apr 25, 2016 at 6:14 AM, Jim Craig  wrote:
> All,
>
> I have posted a new video showing the installation process. This video
> goes over downloading the ISO, Making the bootable flash drive, and
> installing the software.
>
> The video is located here: https://www.youtube.com/watch?v=NavAW5-Xx-Y
>
> I know the audio is less than perfect. I am working on a new audio
> recording setup to improve the quality of the recording.
>
> Part of this video was recorded using Simple Screen Recorder. While the
> picture recording worked fine there was some strange audio artifacts in
> the recording. I think I am 

Re: [Emc-users] Metals question

[andy pugh]

On 25 April 2016 at 17:22, Gene Heskett  wrote:
>
>> On the Holbrook Minor I made a special casting:
>> https://picasaweb.google.com/108164504656404380542/Holbrook#6237477947
>>128358578
>
> There, you did the opposite offset to what I have in mind, but again the
> carriage has a wide enough footprint.

It also has a solid tapered Gib.
And the whole casting rotates on the original compound slide track, so
I can put the offset to the other side if that turns out to be a
better idea.
(The offset is also to enable me to machine the biggest work that will
swing, as there is not _quite_ enough travel on the axis with a
ball-nut replacing the original bronze nut)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] JT for president

[Gene Heskett]

On Monday 25 April 2016 07:41:45 John Thornton wrote:

> Actually that is Swamp East Missouri :)
>
> JT
>
Minor detail John, its only another thousand miles. :)

> On 4/25/2016 4:16 AM, W. Martinjak wrote:
> > The 7i90HD needs just 10 Days from the swamps in Michigan to the
> > valleys in the Alps. Best service ever.
> >
> > Thanks JT!
> >
> > BR matsche
>
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Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Metals question

[Gene Heskett]

On Monday 25 April 2016 06:47:57 Sarah Armstrong wrote:

> Cast Iron is the better Gene ,
> the larger in Dia you can manage the better , it helps spread the load
> over the whol carrage rather than just the area of the toolpost
> i have a similar block on mine which is only an 1 3/8 high x 3 , i
> should have made it at least another inch or two in dia
>
> the only fixing is the through bolt from the carrage , which i made as
> close a sliding fit as possible.
>
This one is mounted to another disk with a rim trapping it in the 
crossfeed, by way of 2 6mm bolts which draw that piece upward, clamping 
the compound, and loosening them will allow me to turn the added piece 
just as if it was the compound, offsetting the QC's holdown bolt hole, 
something I need badly if you been following this sow's ear saga.

Thanks Sarah.

> On 25 April 2016 at 11:29, Gene Heskett  wrote:
> > Greetings all;
> >
> > I may have found the source of some of my tool destroying chatter.
> >
> > I pulled the compound off this POS last night, and discovered that
> > it was not sitting solidly, flat cast iron to flat cast iron at the
> > mating faces, but was rocking on the corners of that screwed onto
> > one bolt-on on the left face that has the angle markings on it.
> >
> > Its attached with flathead screws, and its either take it off, or
> > lap it off.  I did the latter on a sheet of 600 wet-r-dry swimming
> > in cutting oil on my granite flat.
> >
> > For me, since its function can be done by LCNC, it is nothing but a
> > spacer 1.6" tall to hold the QC post. So I have considered replacing
> > it with a round block of metal nominally 3" in diameter so it would
> > sit solidly on the cross slider, be 1.6" thick so it would hold the
> > QC post at a usable height.
> >
> > Having a massive weight there would make sense to me, so while I
> > have a big block of aluminum, I haven't done it out of that as steel
> > or cast iron would add mass which "should" reduce the chatter, plus
> > alu will scratch and dent much easier from toolpost movements its
> > not supposed to do but does. I also noted that the toolposts thru
> > bolt, a 10mm stud, does not screw into the top of the compound
> > slider more than about 3 turns because its not tapped deep enough,
> > and having stripped that thread in one slider already from trying to
> > tighten the tool post to keep it from turning when I am deepening a
> > center drilled starter hole with a drill bit, not in a chuck in the
> > tailstock, but in chuck screwed onto round rod in a boring bar tool
> > carrier which can easily beat the socks off using the poorly aligned
> > tailstocks limited barrel travel for that.
> >
> > As there is surplus stud above the nut, that will get extended about
> > 3 turns of the tap, giving some much needed additional thread
> > engagement so I can put a little more muscle on the wrench without
> > stripping out the threads in the compound.
> >
> > But I want this compound gone as it limits the toolpost placement
> > such that the tool tip is often beyond the puny footprint of the
> > main carriage where cutting forces can and have on hundreds of
> > occasions been more that sufficient to lift the right edge of the
> > carriage off the bed by whatever clearance the gibs might allow,
> > which tips the tool into the workpiece enough that the tool digs in
> > and locks the spindle dead from several hundred revs in just 2 to 5
> > degrees of rotation. As you can imagine thats also broken drive
> > parts up to and including a bent gear shaft in the backgear. 
> > Because of this, I intend to bore the bolt hole for the toolpost
> > about 3/4" off-center so that I can displace the toolpost to the
> > right, pulling the tool tip back into a position where it has
> > carriage enough under it to prevent this tipping even if the gib
> > might allow a couple thou's motion.
> >
> > But I want a plain metal block, and will goto the re-cyclers place
> > today looking for a starter piece to make this from.
> >
> > If one of you had a choice of a block of cast iron this 3" diameter,
> > 1.6" thick piece could be carved out of, or a piece of bar steel of
> > unk additives but likely 1065, both in the iron pile, which would
> > you use?
> >
> > Cheers, Gene Heskett
> > --
> > "There are four boxes to be used in defense of liberty:
> >  soap, ballot, jury, and ammo. Please use in that order."
> > -Ed Howdershelt (Author)
> > Genes Web page 
> >
> >
> > 
> >-- Find and fix application performance issues faster with
> > Applications Manager
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> > your business applications. It resolves application problems quickly
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Re: [Emc-users] Metals question

[Gene Heskett]

On Monday 25 April 2016 06:46:36 andy pugh wrote:

> On 25 April 2016 at 11:29, Gene Heskett  wrote:
> > For me, since its function can be done by LCNC, it is nothing but a
> > spacer 1.6" tall to hold the QC post. So I have considered replacing
> > it with a round block of metal nominally 3" in diameter so it would
> > sit solidly on the cross slider, be 1.6" thick so it would hold the
> > QC post at a usable height.
>
> On the Cheap Chinese Lathe I used a random block of cast iron that my
> dad had lying around (I think it was actually originally a compound
> slide slider).
> https://picasaweb.google.com/108164504656404380542/CNCUnsorted#5858692
>186241200882

That is about the idea, but that lathe has a big enough footprint on the 
carriage to work well with the centered toolpost.

> On the Holbrook Minor I made a special casting:
> https://picasaweb.google.com/108164504656404380542/Holbrook#6237477947
>128358578

There, you did the opposite offset to what I have in mind, but again the 
carriage has a wide enough footprint.  Since most QC holders will put 
the tool tip someplace off the left front corner when using either face 
for the toolholder, I need to move the QC's anchoring bolt to the right 
and possibly in or out.  The mount to the carriage is such that I can 
drill & tap that 10mm hole off-center of the carriage, and pull the tool 
tip back (or fwd as the situation requires) and to the right far enough 
to put the cutting forces inside the carriages footprint on the bed.

That "having it made" gives me an idea, we have a local foundry, making 
huge truck tire wheel inner hubs with the spokes. I might be able to 
scrounge a piece of scrap from them.  First stop of the day in fact.

Thanks Andy.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] _camon.ngc

[andy pugh]

On 25 April 2016 at 17:05, Gene Heskett  wrote:
> So I'm still missing something in my understanding. Why does the machine
> immediately revert to where it started from?

Do one, or the other, but not both...

G43 H99 will apply the T99 offset, but not move the axis.

So:
(save the current position)
#1 = #<_x>
#2 = #<_y>
G43 H99
G0 X#1 Y#2

M4 P5

(move back)

G43
G0 X#2 Y#2

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] _camon.ngc

[Gene Heskett]

On Monday 25 April 2016 06:41:58 andy pugh wrote:

> On 25 April 2016 at 03:38, Gene Heskett  wrote:
> > it appears that the cameras offsets from the camera
> > view to the spindles centerpoint are to be contained in the #5211(X)
> > and #5212(Y) variables,
>
> Those are actually the G92 offsets:
> http://linuxcnc.org/docs/2.7/html/gcode/overview.html#gcode:parameters
>
> If I was configuring such a system I think I would make the camera
> T999 and put the offsets in the tool table.

Is our tool table that big now, or is that just an arbitrary, unlikely to 
be otherwise hit, number?

I already have a T99 entry in the middle of the list:
T99 P99 X-1.2645 Y-0.0485 Z1.1 D0.0001 ;test of camview-emc, added 
20131128

that was imported from the toy mill that I had a camera on until an 
errant jig bolt wiped it off the side of the head where it had it 
mounted.  Then at about lcnc-2.5 (IIRC), the whole camview thing quit 
working due to a newly missing library.  So until now, I've been w/o a 
camera.

_camon.ngc: (With comments not in the file)
==
o<_camon> sub

(save current coordinate)
g92 x0 y0 z0
g92.2
#<_CamOfsX> = #5211
#<_CamOfsY> = #5212
( clear any offsets including above vars )
g92.1

(introduce CAM offset from tool table data)
g43 h99 

(calculate offset as don't know how to read it directly)
( clear any offsets, but vars not saved until lcnc exit)
g92 x0 y0 z0
( clear any offsets in effect w/o clearing the #5211 +8 section)
g92.2
#<_CamOfsX> = [#<_CamOfsX> - #5211]
#<_CamOfsY> = [#<_CamOfsY> - #5212]
g92.1

(PRINT, CAMoffset is X=#<_CamOfsX>, Y=#<_CamOfsY>) 

(move cam for offset)
g91 g0 x#<_CamOfsX> y #<_CamOfsY>
g90

(move for CAM offset - old way with fixed offset)
(g43 h99 g91 g0 x 1.75 y 63.531)
(g90)
o<_camon> endsub
M2


The machine moves, but immediately reverts back to where it was when it 
gets to the T99 offsets. The machine is faster than the camera, so I 
never see it stop at the above locations on screen. I also think those 
locations would be wrong as this camera is mounted on the bottom of my 
spindle locks mount ring, whereas it was mounted on the right side of 
the toys mills head. Both T99 entries would have a quite small y offset, 
but the sign and value for x would change a bit. I could get in the 
ballpark just by changing the x sign in the T99 entry.

So I'm still missing something in my understanding. Why does the machine 
immediately revert to where it started from?

Thanks Andy.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Lubrication

[andy pugh]

On 25 April 2016 at 16:34, Dave Cole  wrote:
> Don't over look grease also. Pressurized oil is probably the best,
> however a lot of machines simply have zerk fittings to grease slides.

A lot of those "zerk" fittins are actually for oil.

When buying a second-hand machine tool it is often necessary to
dismantle it to clean the grease out of the oil nipples. (and hope
that not too much damage has happened since it was done)

http://www.lathespares.co.uk/oil-gun-myford-lathe-1

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Re: [Emc-users] Servo as Steppers by LinuxCnc

[Nicklas Karlsson]

On Mon, 25 Apr 2016 15:52:57 +0300
pyrros...@metrotech-hellas.gr wrote:

> i can send you the whole hal code if you want. I dont know if it is  
> correct to send it here as an attachment or somewhere else (for the  
> rules of emc-users list).
> There are 2 boards. Each  board controls up 3 servo motors. But each  
> board has just one pin for steps and one pin for direction. So with  
> one bitslider and one mux the hal code chooses for which motor is the  
> dir and steps each time. The choice is done with a specific row of hex  
> numbers.

A mux for the step must be a problem then controlling synchronized motion. How 
do you plan to keep several several servo motors running smoothly at once?

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Re: [Emc-users] Lubrication

[Dave Caroline]

I should have mentioned the beam axle was installed in 1849, not sure
if the bearing bronzes have ever been replaced on the beam axle. In my
time (about 15 years) I have only machined one half bearing on a pump
rod that had dirt blocking the oilway, we cleaned the journal surface
with wet and dry about 800 grit and reassembled, no problem since.

it is the regular oiling and keeping dirt out that keeps old stuff running.

http://www.middleton-leawood.org.uk/leawood/photos.html

Dave Caroline

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Re: [Emc-users] Lubrication

[Dave Cole]

 >>Only 30 tons...
Geez, only 30 tons.Hardly worth mentioning.  ;-)

Dave

On 4/25/2016 10:54 AM, Dave Caroline wrote:
> We have the similar sort of problem with the axles on a beam engine,
> they are plain bronze and only rock with 30 tons of rocking weight. we
> actually use a steam cylinder oil for our bearings. It is a type of
> oil like the slideway oil that really sticks to the surface and takes
> little movement to lift the two surfaces apart on a film of lubricant.
>
> Dave Caroline
>
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Re: [Emc-users] Lubrication

[Dave Cole]

Don't over look grease also. Pressurized oil is probably the best, 
however a lot of machines simply have zerk fittings to grease slides.
I think a lot of that depends on the speed that the bearing operates at.

Dave

On 4/25/2016 11:26 AM, Nicklas Karlsson wrote:
> Sounds reasonable. Slideway wear I would consider a major problem for a 
> machine. Smaller parts however could be changed.
>
> On Mon, 25 Apr 2016 10:59:00 -0400
> Bruce Layne  wrote:
>
>> I waited a little while to see if any experts provided a definitive
>> reference.  This list amazes me at times with the cumulative knowledge,
>> and I'm still hoping something is posted that is concise and
>> informative.  I know that Misumi provides good technical info for their
>> products and I seem to recall them discussing the maintenance and
>> lubrication of linear motion systems.  Found it!
>>
>> http://blog.misumiusa.com/ball-screw-lubrication-tips-application-grease-vs-oil
>>
>> My simplistic approach:
>>
>> 1) If the manufacturer of the machine or the linear motion components
>> recommends a specific lubricant, that's what I use.  Even the expensive
>> grease is cheap considering that a little goes a long way and replacing
>> motion control components is very expensive and time consuming.
>>
>> 2) Each machine has its own grease gun, etc., stored at the machine.  I
>> consider this part of the machine.  I don't want to wonder what grease
>> each machine needs, and I don't want to go looking for the right
>> grease.  If it's right there, I'll do the proper maintenance.
>>
>> 3) Barring a manufacturer's lubricant specification, I choose a good
>> synthetic grease.  It's usually a Mobil product.  I prefer greases that
>> are reddish or cream colored, rather than black or dark brown greases.
>> I want to see a thin film of grease, but when I wipe off the old grease
>> I don't want to see black gunk on the light blue lint free shop towel.
>> If I see black, I assume it's some grimy contaminate.
>>
>> There is a very cursory introduction to grease on McMaster-Carr's site.
>>
>> http://www.mcmaster.com/#standard-grease/=124w94o
>>
>> Click the About Grease link.
>>
>> Grease is basically oil and a thickening agent.  I select a synthetic
>> oil base because it doesn't form gummy or varnish residues as readily as
>> petroleum based oils.  Similarly, I look for a thickening agent that
>> doesn't readily oxidize to form thick gummy residues.  The thickener
>> oxidation resistance is one of the columns on the McMaster-Carr About
>> Grease information page.
>>
>> I would prefer a thicker grease because the thinner greases will often
>> separate in the grease gun and leak oil all over the place and make a
>> mess, but I don't let that determine my choice of NLGI ratings.
>> Instead, I choose the thickness based on the application and
>> temperature, and I keep the grease gun (usually the small 3 ounce size)
>> in a heavy duty plastic zip top bag.
>>
>> Probably more important than the grease in my opinion is the lubrication
>> schedule and overall cleanliness.  I'm a bit of a stickler about this.
>> Cover the motion control components if they're exposed to contaminates,
>> but don't cover them and forget about them.  Precision motion control
>> components require maintenance.  I prefer to wipe the old grease off
>> linear rods or linear rail at the end of the day.  Wipe away from the
>> bearings using a clean lint free shop towel.  Inspect the wipers for
>> damage and replace if needed. Use a grease gun to inject new grease into
>> the bearings to push out the old grease.  Run G code that moves the
>> machine to the limits to distribute new grease to the linear rods or
>> rails.  It's a good idea to run this program at the start of the next
>> day to exercise the machine before the start of the next day's machining.
>>
>> Finally, when we build machines, we have the opportunity to improve the
>> motion control longevity by keeping these parts clean, and this concept
>> applies even on the simplest machine.  I'm currently wrapping up a 24" X
>> 24" CNC router build, to be used almost exclusively to cut plastic
>> sheets.  The Y axis linear rods are exposed on the side.  Rather than a
>> simple spoil board on top, I'm using a 1/2" thick ABS plastic top plate
>> that overhangs the sides as much as possible to protect the linear rails
>> from swarf dropping onto them.  The top plate has side shields that
>> extend upward to almost completely eliminate swarf dropping onto the Y
>> axis linear rods.  An air blow off will constantly push the chips toward
>> the back as they're produced.  The top plate extends far enough to the
>> rear to protect the Y axis stepper motor and the Y axis ball screw. The
>> top plate has a vertical back wall to stop the chips from falling off
>> the back of the machine.  The chips pile up on the shelf behind the
>> active machining area, where they can be easily vacuumed away.  Even
>> though the Y axis 

Re: [Emc-users] Lubrication, (Slideway wear)

[Bengt Sjölund]

  Do you happen to know how if wear are a common problem for slideways and 
proper lubrication is important to avoid wear?


oil should be oozing out from slideways, if not old oil can be clogged 
in the oil lines.

Cheers
Bengt

Den 2016-04-25 kl. 17:14, skrev Nicklas Karlsson:
> On Mon, 25 Apr 2016 15:43:16 +0100
> andy pugh  wrote:
>
>> On 25 April 2016 at 15:37, Nicklas Karlsson
>>  wrote:
>>> Yes these kind of bearing or whatever it is called used to move spindle or 
>>> table in CNC machines. High friction I will discover although then high 
>>> wear is discovered it is a little bit late.
>> For that application you want "slideway lubricant"
>> http://www.alexoil.co.uk/industrial-gear-and-slideway-lubricants_c80.aspx
>> for example
> Yes then I know the name it become easier. Do you happen to know how if wear 
> are a common problem for slideways and proper lubrication is important to 
> avoid wear?
>
> I have table top engraver with nipples and real machine with some kind of 
> centralized system. It is good to know what happen is lubrication is not good 
> enough. Increased friction will increase current in servo motors so if this 
> is common a meter for used current in servo motors would be good. I however 
> increased wear is a problem lubrication must be checked manually at regular 
> intervals.
>
>
> Nicklas Karlsson
>
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Re: [Emc-users] Lubrication

[Nicklas Karlsson]

Sounds reasonable. Slideway wear I would consider a major problem for a 
machine. Smaller parts however could be changed.

On Mon, 25 Apr 2016 10:59:00 -0400
Bruce Layne  wrote:

> I waited a little while to see if any experts provided a definitive 
> reference.  This list amazes me at times with the cumulative knowledge, 
> and I'm still hoping something is posted that is concise and 
> informative.  I know that Misumi provides good technical info for their 
> products and I seem to recall them discussing the maintenance and 
> lubrication of linear motion systems.  Found it!
> 
> http://blog.misumiusa.com/ball-screw-lubrication-tips-application-grease-vs-oil
> 
> My simplistic approach:
> 
> 1) If the manufacturer of the machine or the linear motion components 
> recommends a specific lubricant, that's what I use.  Even the expensive 
> grease is cheap considering that a little goes a long way and replacing 
> motion control components is very expensive and time consuming.
> 
> 2) Each machine has its own grease gun, etc., stored at the machine.  I 
> consider this part of the machine.  I don't want to wonder what grease 
> each machine needs, and I don't want to go looking for the right 
> grease.  If it's right there, I'll do the proper maintenance.
> 
> 3) Barring a manufacturer's lubricant specification, I choose a good 
> synthetic grease.  It's usually a Mobil product.  I prefer greases that 
> are reddish or cream colored, rather than black or dark brown greases.  
> I want to see a thin film of grease, but when I wipe off the old grease 
> I don't want to see black gunk on the light blue lint free shop towel.  
> If I see black, I assume it's some grimy contaminate.
> 
> There is a very cursory introduction to grease on McMaster-Carr's site.
> 
> http://www.mcmaster.com/#standard-grease/=124w94o
> 
> Click the About Grease link.
> 
> Grease is basically oil and a thickening agent.  I select a synthetic 
> oil base because it doesn't form gummy or varnish residues as readily as 
> petroleum based oils.  Similarly, I look for a thickening agent that 
> doesn't readily oxidize to form thick gummy residues.  The thickener 
> oxidation resistance is one of the columns on the McMaster-Carr About 
> Grease information page.
> 
> I would prefer a thicker grease because the thinner greases will often 
> separate in the grease gun and leak oil all over the place and make a 
> mess, but I don't let that determine my choice of NLGI ratings.  
> Instead, I choose the thickness based on the application and 
> temperature, and I keep the grease gun (usually the small 3 ounce size) 
> in a heavy duty plastic zip top bag.
> 
> Probably more important than the grease in my opinion is the lubrication 
> schedule and overall cleanliness.  I'm a bit of a stickler about this.  
> Cover the motion control components if they're exposed to contaminates, 
> but don't cover them and forget about them.  Precision motion control 
> components require maintenance.  I prefer to wipe the old grease off 
> linear rods or linear rail at the end of the day.  Wipe away from the 
> bearings using a clean lint free shop towel.  Inspect the wipers for 
> damage and replace if needed. Use a grease gun to inject new grease into 
> the bearings to push out the old grease.  Run G code that moves the 
> machine to the limits to distribute new grease to the linear rods or 
> rails.  It's a good idea to run this program at the start of the next 
> day to exercise the machine before the start of the next day's machining.
> 
> Finally, when we build machines, we have the opportunity to improve the 
> motion control longevity by keeping these parts clean, and this concept 
> applies even on the simplest machine.  I'm currently wrapping up a 24" X 
> 24" CNC router build, to be used almost exclusively to cut plastic 
> sheets.  The Y axis linear rods are exposed on the side.  Rather than a 
> simple spoil board on top, I'm using a 1/2" thick ABS plastic top plate 
> that overhangs the sides as much as possible to protect the linear rails 
> from swarf dropping onto them.  The top plate has side shields that 
> extend upward to almost completely eliminate swarf dropping onto the Y 
> axis linear rods.  An air blow off will constantly push the chips toward 
> the back as they're produced.  The top plate extends far enough to the 
> rear to protect the Y axis stepper motor and the Y axis ball screw. The 
> top plate has a vertical back wall to stop the chips from falling off 
> the back of the machine.  The chips pile up on the shelf behind the 
> active machining area, where they can be easily vacuumed away.  Even 
> though the Y axis linear rods are well protected from chips and debris, 
> they are easy to access for quick daily maintenance.
> 
> 
> 
> On 4/25/2016 9:17 AM, Nicklas Karlsson wrote:
> > Do anyone have experience on lubrication of slide bearings, ball bearings 
> > and such things?
> 
> 
> 
> 

Re: [Emc-users] Lubrication, (Slideway wear)

[Nicklas Karlsson]

On Mon, 25 Apr 2016 15:43:16 +0100
andy pugh  wrote:

> On 25 April 2016 at 15:37, Nicklas Karlsson
>  wrote:
> >
> > Yes these kind of bearing or whatever it is called used to move spindle or 
> > table in CNC machines. High friction I will discover although then high 
> > wear is discovered it is a little bit late.
> 
> For that application you want "slideway lubricant"
> http://www.alexoil.co.uk/industrial-gear-and-slideway-lubricants_c80.aspx
> for example

Yes then I know the name it become easier. Do you happen to know how if wear 
are a common problem for slideways and proper lubrication is important to avoid 
wear?

I have table top engraver with nipples and real machine with some kind of 
centralized system. It is good to know what happen is lubrication is not good 
enough. Increased friction will increase current in servo motors so if this is 
common a meter for used current in servo motors would be good. I however 
increased wear is a problem lubrication must be checked manually at regular 
intervals.


Nicklas Karlsson

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Re: [Emc-users] Lubrication

[Bruce Layne]

I waited a little while to see if any experts provided a definitive 
reference.  This list amazes me at times with the cumulative knowledge, 
and I'm still hoping something is posted that is concise and 
informative.  I know that Misumi provides good technical info for their 
products and I seem to recall them discussing the maintenance and 
lubrication of linear motion systems.  Found it!

http://blog.misumiusa.com/ball-screw-lubrication-tips-application-grease-vs-oil

My simplistic approach:

1) If the manufacturer of the machine or the linear motion components 
recommends a specific lubricant, that's what I use.  Even the expensive 
grease is cheap considering that a little goes a long way and replacing 
motion control components is very expensive and time consuming.

2) Each machine has its own grease gun, etc., stored at the machine.  I 
consider this part of the machine.  I don't want to wonder what grease 
each machine needs, and I don't want to go looking for the right 
grease.  If it's right there, I'll do the proper maintenance.

3) Barring a manufacturer's lubricant specification, I choose a good 
synthetic grease.  It's usually a Mobil product.  I prefer greases that 
are reddish or cream colored, rather than black or dark brown greases.  
I want to see a thin film of grease, but when I wipe off the old grease 
I don't want to see black gunk on the light blue lint free shop towel.  
If I see black, I assume it's some grimy contaminate.

There is a very cursory introduction to grease on McMaster-Carr's site.

http://www.mcmaster.com/#standard-grease/=124w94o

Click the About Grease link.

Grease is basically oil and a thickening agent.  I select a synthetic 
oil base because it doesn't form gummy or varnish residues as readily as 
petroleum based oils.  Similarly, I look for a thickening agent that 
doesn't readily oxidize to form thick gummy residues.  The thickener 
oxidation resistance is one of the columns on the McMaster-Carr About 
Grease information page.

I would prefer a thicker grease because the thinner greases will often 
separate in the grease gun and leak oil all over the place and make a 
mess, but I don't let that determine my choice of NLGI ratings.  
Instead, I choose the thickness based on the application and 
temperature, and I keep the grease gun (usually the small 3 ounce size) 
in a heavy duty plastic zip top bag.

Probably more important than the grease in my opinion is the lubrication 
schedule and overall cleanliness.  I'm a bit of a stickler about this.  
Cover the motion control components if they're exposed to contaminates, 
but don't cover them and forget about them.  Precision motion control 
components require maintenance.  I prefer to wipe the old grease off 
linear rods or linear rail at the end of the day.  Wipe away from the 
bearings using a clean lint free shop towel.  Inspect the wipers for 
damage and replace if needed. Use a grease gun to inject new grease into 
the bearings to push out the old grease.  Run G code that moves the 
machine to the limits to distribute new grease to the linear rods or 
rails.  It's a good idea to run this program at the start of the next 
day to exercise the machine before the start of the next day's machining.

Finally, when we build machines, we have the opportunity to improve the 
motion control longevity by keeping these parts clean, and this concept 
applies even on the simplest machine.  I'm currently wrapping up a 24" X 
24" CNC router build, to be used almost exclusively to cut plastic 
sheets.  The Y axis linear rods are exposed on the side.  Rather than a 
simple spoil board on top, I'm using a 1/2" thick ABS plastic top plate 
that overhangs the sides as much as possible to protect the linear rails 
from swarf dropping onto them.  The top plate has side shields that 
extend upward to almost completely eliminate swarf dropping onto the Y 
axis linear rods.  An air blow off will constantly push the chips toward 
the back as they're produced.  The top plate extends far enough to the 
rear to protect the Y axis stepper motor and the Y axis ball screw. The 
top plate has a vertical back wall to stop the chips from falling off 
the back of the machine.  The chips pile up on the shelf behind the 
active machining area, where they can be easily vacuumed away.  Even 
though the Y axis linear rods are well protected from chips and debris, 
they are easy to access for quick daily maintenance.



On 4/25/2016 9:17 AM, Nicklas Karlsson wrote:
> Do anyone have experience on lubrication of slide bearings, ball bearings and 
> such things?



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Re: [Emc-users] Lubrication

[Dave Caroline]

We have the similar sort of problem with the axles on a beam engine,
they are plain bronze and only rock with 30 tons of rocking weight. we
actually use a steam cylinder oil for our bearings. It is a type of
oil like the slideway oil that really sticks to the surface and takes
little movement to lift the two surfaces apart on a film of lubricant.

Dave Caroline

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Re: [Emc-users] Lubrication

[andy pugh]

On 25 April 2016 at 15:37, Nicklas Karlsson
 wrote:
>
> Yes these kind of bearing or whatever it is called used to move spindle or 
> table in CNC machines. High friction I will discover although then high wear 
> is discovered it is a little bit late.

For that application you want "slideway lubricant"
http://www.alexoil.co.uk/industrial-gear-and-slideway-lubricants_c80.aspx
for example

-- 
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
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Re: [Emc-users] Lubrication

[Nicklas Karlsson]

> On 4/25/2016 9:17 AM, Nicklas Karlsson wrote:
> > Do anyone have experience on lubrication of slide bearings, ball bearings 
> > and such things?
> 
> My guess is that everyone on this list has some experience with that..   
> Can you narrow the subject a bit?
> 
> Dave

Yes these kind of bearing or whatever it is called used to move spindle or 
table in CNC machines. High friction I will discover although then high wear is 
discovered it is a little bit late.

I expect these flat iron surfaces will be very expensive to regrind and want to 
avoid it.


Regards Nicklas Karlsson

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Re: [Emc-users] Lubrication

[Dale Ertley]

Hello
The actual service life of wind turbine gearboxes is often well below the 
desired 20 years. One of the prevalent failure modes in gearbox bearing 
raceways is white structure flaking (WSF) by the formation of butterflies and 
white etching cracks with associated microstructural change called white 
etching areas.
Dale 

On Monday, April 25, 2016 9:59 AM, Dave Cole  
wrote:
 

 On 4/25/2016 9:17 AM, Nicklas Karlsson wrote:
> Do anyone have experience on lubrication of slide bearings, ball bearings and 
> such things?

My guess is that everyone on this list has some experience with that..  
Can you narrow the subject a bit?

Dave

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Re: [Emc-users] Lubrication

[Leonardo Marsaglia]

2016-04-25 11:10 GMT-03:00 Leonardo Marsaglia :

>
> The oil is dripped directly on the bearings but it's an open circuit,
> nothing complicated. The oil returns to the pump via a 5/16 cooper tube. I
> really don't know wich kind of pump this is, but I suspect it has an
> eccentric with a diaphragm.
>

Sorry, the return is a bigger hose. The 5/16 cooper tube is the output of
the pump


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Re: [Emc-users] Lubrication

[andy pugh]

On 25 April 2016 at 14:17, Nicklas Karlsson
 wrote:
> Do anyone have experience on lubrication of slide bearings, ball bearings and 
> such things?

You could contact https://www.linkedin.com/in/gareth-fish-b841961b

-- 
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lunatics."
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Re: [Emc-users] Lubrication

[Leonardo Marsaglia]

Here we've got an old Italian lathe that is dedicated to gundrilling and
for the spindle bearings (wich are two roller radial bearings and a thrust
roller bearing), it has a simple oil pump driven by the same spindle motor,
so it turns whenever the spindle turns.

The oil is dripped directly on the bearings but it's an open circuit,
nothing complicated. The oil returns to the pump via a 5/16 cooper tube. I
really don't know wich kind of pump this is, but I suspect it has an
eccentric with a diaphragm.



2016-04-25 10:54 GMT-03:00 Dave Cole :

> On 4/25/2016 9:17 AM, Nicklas Karlsson wrote:
> > Do anyone have experience on lubrication of slide bearings, ball
> bearings and such things?
>
> My guess is that everyone on this list has some experience with that..
> Can you narrow the subject a bit?
>
> Dave
>
>
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[Emc-users] Lubrication

[Roland Jollivet]

I just so happened to spend the whole weekend reading about bearings and
lubrication. Here are some articles with discussion on lubrication.
I don't know if the links will work for you. They might get chopped up. I
can send the titles for you to google if this does not work.

Regards
Roland



https://www.google.com/url?sa=t=j==s=web=1=rja=8=0ahUKEwioh6mf-anMAhVqBcAKHWYHDOUQFggcMAA=http%3A%2F%2Fwww.timken.com%2Fen-us%2Fproducts%2Fdocuments%2Fsuper-precision-bearings-for-machine-tool-applications-catalog.pdf=AFQjCNEWfzDl0SJ_gjGXZnU1JonJTI5hOg=1NDtUcyWv806PamMc-bsTA=bv.119745492,d.ZGg

https://www.google.com/url?sa=t=j==s=web=1=rja=8=0ahUKEwj3ssrI-anMAhXhDMAKHSnACYsQFggeMAA=http%3A%2F%2Fwww.klueber.com%2FecomaXL%2Ffiles%2FSpecial_lubricants_for_rolling_bearings_selection.pdf=AFQjCNFVU-svayhdPnMjNRHUGNRHKCDURg=xK5GRjCgUchD5C9QL5tZAA=bv.119745492,d.ZGg

https://www.google.com/url?sa=t=j==s=web=1=rja=8=0ahUKEwj0tPXi-anMAhVoKcAKHRHnC3sQFggeMAA=http%3A%2F%2Fwww.gmn.de%2Fupload%2F99_Downloads%2F10_Ball_Bearings%2FPDFs%2FFettverteilungslauf_e.pdf=AFQjCNEFe8Z5EczB0Kb1y3YsmEq7euttfA=fviPK4OVb-pEvWbV46jWYA=bv.119745492,d.ZGg

https://www.google.com/url?sa=t=j==s=web=1=rja=8=0ahUKEwjO1YH2-anMAhUMD8AKHRQ1DZYQFggcMAA=http%3A%2F%2Fwww.klueber.com%2FecomaXL%2Fget_blob.php%3Fname%3D5_Klueber_tips_rolling_bearings_run-in_procedure_en.pdf=AFQjCNFhtHCLarQP2i97axSPrRWCG9bkDw=dhWBBc6lOKkcxld8lL5dtQ=bv.119745492,d.ZGg

https://www.google.com/url?sa=t=j==s=web=1=rja=8=0ahUKEwjY8I2O-qnMAhWkKcAKHejoCYUQFggeMAA=http%3A%2F%2Fwww.astbearings.com%2Fassets%2Ffiles%2FBearing-Lubrication-Technical-Information-Sheet_ENB-04-0555.pdf=AFQjCNEY1iyDEO8qK9UdNvUtHl0QCIT7_w=Zot11Fr1RpyFnoNxbDp9WA=bv.119745492,d.ZGg

https://www.google.com/url?sa=t=j==s=web=1=rja=8=0ahUKEwixzKm1-qnMAhXmCcAKHQdCDNsQFggcMAA=http%3A%2F%2Fwww.nskamericas.com%2Fcps%2Frde%2Fdtr%2Fna_es%2Fna_literature_bearing%2FTechnical_Report_NSK_CAT_E728g.pdf=AFQjCNGnNOO0u17Z5yfwwt8DoZc1vW9IyA=WWKu56roz6tc3zyDRMc_Qg=bv.119745492,d.ZGg

https://www.google.com/url?sa=t=j==s=web=1=rja=8=0ahUKEwi0tNfL-qnMAhVoLsAKHZOEDG0QFggcMAA=http%3A%2F%2Fwww.skf.com%2Fbinary%2F138-121486%2FSKF-rolling-bearings-catalogue.pdf=AFQjCNEsffpdglEnZBEv9UTO9_ty6vCi9g=JaSJZ4HCzYJw9eIdSVhvAA=bv.119745492,d.ZGg



On 25 April 2016 at 15:50, Nicklas Karlsson 
wrote:

> > And a reading list if you have a good local library
> > http://www.collection.archivist.info/searchv13.php?searchstr=621.822
> >
> > Dave Caroline
>
> I read the list and it seems nobody cared about lubrication for like more
> than sixty years. It is on the limit the last person who wrote a book about
> lubrication is dead.
>
>
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Re: [Emc-users] Lubrication

[Dave Cole]

On 4/25/2016 9:17 AM, Nicklas Karlsson wrote:
> Do anyone have experience on lubrication of slide bearings, ball bearings and 
> such things?

My guess is that everyone on this list has some experience with that..   
Can you narrow the subject a bit?

Dave

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Re: [Emc-users] Lubrication

[Nicklas Karlsson]

> And a reading list if you have a good local library
> http://www.collection.archivist.info/searchv13.php?searchstr=621.822
> 
> Dave Caroline

I read the list and it seems nobody cared about lubrication for like more than 
sixty years. It is on the limit the last person who wrote a book about 
lubrication is dead.

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Re: [Emc-users] Servo as Steppers by LinuxCnc

[pyrros . ts]

i can send you the whole hal code if you want. I dont know if it is  
correct to send it here as an attachment or somewhere else (for the  
rules of emc-users list).
There are 2 boards. Each  board controls up 3 servo motors. But each  
board has just one pin for steps and one pin for direction. So with  
one bitslider and one mux the hal code chooses for which motor is the  
dir and steps each time. The choice is done with a specific row of hex  
numbers.


Quoting andy pugh :

> On 25 April 2016 at 10:53,  
> t.
>> It has servo motors but they work through linuxcnc as stepper motors.
>> I send steps and direction in the board of mitsubishi for motors.
>
>> When i use servo as steppers how could i choose the step time,step
>> space,direction hold and setup
>
> Those will be specified in the Mitsubishi drive manual.
>
>> There is a trick with hal by using a bitslice.
> Can you give more detail about this?
> If you are passing step signals through bitslice then I can imagine it
> might upset the step timing.
>
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
>
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Re: [Emc-users] Lubrication

[Dave Caroline]

And a reading list if you have a good local library
http://www.collection.archivist.info/searchv13.php?searchstr=621.822

Dave Caroline

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Re: [Emc-users] Lubrication

[Dave Caroline]

This is a deep subject named tribology. some lubricant makers also
provide recommendations.
see refs at bottom
https://en.wikipedia.org/wiki/Tribology

Dave Caroline

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[Emc-users] Lubrication

[Nicklas Karlsson]

Do anyone have experience on lubrication of slide bearings, ball bearings and 
such things?

Experience of bad lubrication with destroyed bearings is of particular 
interest. References to documentation is also good and in particular scientific 
articles.


Regards Nicklas Karlsson

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[Emc-users] Learning LinuxCNC Installation Video

[Jim Craig]

All,

I have posted a new video showing the installation process. This video 
goes over downloading the ISO, Making the bootable flash drive, and 
installing the software.

The video is located here: https://www.youtube.com/watch?v=NavAW5-Xx-Y

I know the audio is less than perfect. I am working on a new audio 
recording setup to improve the quality of the recording.

Part of this video was recorded using Simple Screen Recorder. While the 
picture recording worked fine there was some strange audio artifacts in 
the recording. I think I am going to record the audio stream completely 
separate from the video as I have no way to put an external mic on my 
current camcorder.

I have a USB studio condenser mic but I don't think it will record well 
into a linux pc from what I have read. I am contemplating capturing the 
audio into my winders machine.

Let me know what suggestions you have about the audio.

Thanks,

Jim
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Re: [Emc-users] Servo as Steppers by LinuxCnc

[andy pugh]

On 25 April 2016 at 13:52,   wrote:

> There are 2 boards. Each  board controls up 3 servo motors. But each board
> has just one pin for steps and one pin for direction. So with one bitslider
> and one mux the hal code chooses for which motor is the dir and steps each
> time.

I could imagine that going wrong if both motors need a pulse on the
same base-thread cycle.

I think that you might actually need a custom HAL component to manage
your muxed stepgens.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] Servo as Steppers by LinuxCnc

[Nicklas Karlsson]

> I have a robot RM501 of Mitsubishi to program it with linux cnc.
> There is already connection with linuxcnc but when i send G code  
> commands it doesnt go exactly where i want.

You could not expect dynamic response to be infinitely fast then of course 
there may be noise on the signal.


Nicklas Karlsson

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Re: [Emc-users] JT for president

[W. Martinjak]

On 2016-04-25 13:41, John Thornton wrote:
> Actually that is Swamp East Missouri :)

Ooops!
This happens when fingers try to think ;)

Sorry!


-- 
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nur ihre Gegner sterben nach und nach"

Max Planck


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Re: [Emc-users] JT for president

[Mark]

There ya have it.  No swamps or trout in Michigan.  

Mark

On 04/25/2016 07:41 AM, John Thornton wrote:
> Actually that is Swamp East Missouri :)
>
> JT
>
> On 4/25/2016 4:16 AM, W. Martinjak wrote:
>> The 7i90HD needs just 10 Days from the swamps in Michigan to the valleys in 
>> the Alps.
>> Best service ever.
>>
>> Thanks JT!
>>
>> BR matsche


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Re: [Emc-users] JT for president

[sam sokolik]

damn auto-correct!  ;)

sam

On 4/25/2016 6:41 AM, John Thornton wrote:
> Actually that is Swamp East Missouri :)
>
> JT
>
> On 4/25/2016 4:16 AM, W. Martinjak wrote:
>> The 7i90HD needs just 10 Days from the swamps in Michigan to the valleys in 
>> the Alps.
>> Best service ever.
>>
>> Thanks JT!
>>
>> BR matsche
>>
>
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Re: [Emc-users] JT for president

[Mark]

On 04/25/2016 05:16 AM, W. Martinjak wrote:
> The 7i90HD needs just 10 Days from the swamps in Michigan to the valleys in 
> the Alps.
> Best service ever.
>
> Thanks JT!
>
> BR matsche
>

Swamps? There's no swamps.  There's no trout in Michigan either. ;-)

Mark
Grayling, MI

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[Emc-users] lathe project for sale

[Anders Wallin]

Hi all,
I have a lathe project for sale (due to lack of time...). Images here:
https://www.dropbox.com/sh/d5gl0ga35zljsdb/AAD_9FseS-Zx1VLwIkrjuub6a?dl=0
Located in Helsinki Finland. Northern Europe would be preferred especially
for heavy items.

In particular for someone building a linuxcnc-based lathe controller this
includes a kit of parts that could be suitable:
- mesa card with ribbon-cables and breakout-boards
- pico systems brushless servo drives + 48VDC powersupplies
- keling NEMA23 servos with encoders
- 1.7 kW brushless spindle servo with brake, resolver, encoder (heavy!)
- Bonmet servo drive for spindle servo (230VAC 1-phase input)
- two jogwheels

I want to get rid of this so make me your best offer for everything and
we'll make a deal!
follow-ups directly to me or to the linuxcnc forum (see recent post under
"User exchange")

thanks,
Anders
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Re: [Emc-users] JT for president

[John Thornton]

Actually that is Swamp East Missouri :)

JT

On 4/25/2016 4:16 AM, W. Martinjak wrote:
> The 7i90HD needs just 10 Days from the swamps in Michigan to the valleys in 
> the Alps.
> Best service ever.
>
> Thanks JT!
>
> BR matsche
>


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Re: [Emc-users] Servo as Steppers by LinuxCnc

[andy pugh]

On 25 April 2016 at 10:53,  
t.
> It has servo motors but they work through linuxcnc as stepper motors.
> I send steps and direction in the board of mitsubishi for motors.

> When i use servo as steppers how could i choose the step time,step
> space,direction hold and setup

Those will be specified in the Mitsubishi drive manual.

> There is a trick with hal by using a bitslice.
Can you give more detail about this?
If you are passing step signals through bitslice then I can imagine it
might upset the step timing.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] Metals question

[Sarah Armstrong]

Cast Iron is the better Gene ,
the larger in Dia you can manage the better , it helps spread the load over
the whol carrage rather than just the area of the toolpost
i have a similar block on mine which is only an 1 3/8 high x 3 , i should
have made it at least another inch or two in dia

the only fixing is the through bolt from the carrage , which i made as
close a sliding fit as possible.



On 25 April 2016 at 11:29, Gene Heskett  wrote:

> Greetings all;
>
> I may have found the source of some of my tool destroying chatter.
>
> I pulled the compound off this POS last night, and discovered that it was
> not sitting solidly, flat cast iron to flat cast iron at the mating
> faces, but was rocking on the corners of that screwed onto one bolt-on
> on the left face that has the angle markings on it.
>
> Its attached with flathead screws, and its either take it off, or lap it
> off.  I did the latter on a sheet of 600 wet-r-dry swimming in cutting
> oil on my granite flat.
>
> For me, since its function can be done by LCNC, it is nothing but a
> spacer 1.6" tall to hold the QC post. So I have considered replacing it
> with a round block of metal nominally 3" in diameter so it would sit
> solidly on the cross slider, be 1.6" thick so it would hold the QC post
> at a usable height.
>
> Having a massive weight there would make sense to me, so while I have a
> big block of aluminum, I haven't done it out of that as steel or cast
> iron would add mass which "should" reduce the chatter, plus alu will
> scratch and dent much easier from toolpost movements its not supposed to
> do but does. I also noted that the toolposts thru bolt, a 10mm stud,
> does not screw into the top of the compound slider more than about 3
> turns because its not tapped deep enough, and having stripped that
> thread in one slider already from trying to tighten the tool post to
> keep it from turning when I am deepening a center drilled starter hole
> with a drill bit, not in a chuck in the tailstock, but in chuck screwed
> onto round rod in a boring bar tool carrier which can easily beat the
> socks off using the poorly aligned tailstocks limited barrel travel for
> that.
>
> As there is surplus stud above the nut, that will get extended about 3
> turns of the tap, giving some much needed additional thread engagement
> so I can put a little more muscle on the wrench without stripping out
> the threads in the compound.
>
> But I want this compound gone as it limits the toolpost placement such
> that the tool tip is often beyond the puny footprint of the main
> carriage where cutting forces can and have on hundreds of occasions been
> more that sufficient to lift the right edge of the carriage off the bed
> by whatever clearance the gibs might allow, which tips the tool into the
> workpiece enough that the tool digs in and locks the spindle dead from
> several hundred revs in just 2 to 5 degrees of rotation. As you can
> imagine thats also broken drive parts up to and including a bent gear
> shaft in the backgear.  Because of this, I intend to bore the bolt hole
> for the toolpost about 3/4" off-center so that I can displace the
> toolpost to the right, pulling the tool tip back into a position where
> it has carriage enough under it to prevent this tipping even if the gib
> might allow a couple thou's motion.
>
> But I want a plain metal block, and will goto the re-cyclers place today
> looking for a starter piece to make this from.
>
> If one of you had a choice of a block of cast iron this 3" diameter, 1.6"
> thick piece could be carved out of, or a piece of bar steel of unk
> additives but likely 1065, both in the iron pile, which would you use?
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page 
>
>
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> Manager
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>



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Re: [Emc-users] Metals question

[andy pugh]

On 25 April 2016 at 11:29, Gene Heskett  wrote:
>
> For me, since its function can be done by LCNC, it is nothing but a
> spacer 1.6" tall to hold the QC post. So I have considered replacing it
> with a round block of metal nominally 3" in diameter so it would sit
> solidly on the cross slider, be 1.6" thick so it would hold the QC post
> at a usable height.

On the Cheap Chinese Lathe I used a random block of cast iron that my
dad had lying around (I think it was actually originally a compound
slide slider).
https://picasaweb.google.com/108164504656404380542/CNCUnsorted#5858692186241200882

On the Holbrook Minor I made a special casting:
https://picasaweb.google.com/108164504656404380542/Holbrook#6237477947128358578

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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Re: [Emc-users] _camon.ngc

[andy pugh]

On 25 April 2016 at 03:38, Gene Heskett  wrote:
> it appears that the cameras offsets from the camera
> view to the spindles centerpoint are to be contained in the #5211(X) and
> #5212(Y) variables,

Those are actually the G92 offsets:
http://linuxcnc.org/docs/2.7/html/gcode/overview.html#gcode:parameters

If I was configuring such a system I think I would make the camera
T999 and put the offsets in the tool table.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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[Emc-users] Servo as Steppers by LinuxCnc

[pyrros . ts]

I have a robot RM501 of Mitsubishi to program it with linux cnc.
There is already connection with linuxcnc but when i send G code  
commands it doesnt go exactly where i want.
It has servo motors but they work through linuxcnc as stepper motors.  
I send steps and direction in the board of mitsubishi for motors.  
There is a trick with hal by using a bitslice.
When i use servo as steppers how could i choose the step time,step  
space,direction hold and setup in order to see if i have stalls.
I mention that the robot does correct the homing.

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[Emc-users] Metals question

[Gene Heskett]

Greetings all;

I may have found the source of some of my tool destroying chatter.

I pulled the compound off this POS last night, and discovered that it was 
not sitting solidly, flat cast iron to flat cast iron at the mating 
faces, but was rocking on the corners of that screwed onto one bolt-on 
on the left face that has the angle markings on it.

Its attached with flathead screws, and its either take it off, or lap it 
off.  I did the latter on a sheet of 600 wet-r-dry swimming in cutting 
oil on my granite flat.

For me, since its function can be done by LCNC, it is nothing but a 
spacer 1.6" tall to hold the QC post. So I have considered replacing it 
with a round block of metal nominally 3" in diameter so it would sit 
solidly on the cross slider, be 1.6" thick so it would hold the QC post 
at a usable height.

Having a massive weight there would make sense to me, so while I have a 
big block of aluminum, I haven't done it out of that as steel or cast 
iron would add mass which "should" reduce the chatter, plus alu will 
scratch and dent much easier from toolpost movements its not supposed to 
do but does. I also noted that the toolposts thru bolt, a 10mm stud, 
does not screw into the top of the compound slider more than about 3 
turns because its not tapped deep enough, and having stripped that 
thread in one slider already from trying to tighten the tool post to 
keep it from turning when I am deepening a center drilled starter hole 
with a drill bit, not in a chuck in the tailstock, but in chuck screwed 
onto round rod in a boring bar tool carrier which can easily beat the 
socks off using the poorly aligned tailstocks limited barrel travel for 
that.

As there is surplus stud above the nut, that will get extended about 3 
turns of the tap, giving some much needed additional thread engagement 
so I can put a little more muscle on the wrench without stripping out 
the threads in the compound.

But I want this compound gone as it limits the toolpost placement such 
that the tool tip is often beyond the puny footprint of the main 
carriage where cutting forces can and have on hundreds of occasions been 
more that sufficient to lift the right edge of the carriage off the bed 
by whatever clearance the gibs might allow, which tips the tool into the 
workpiece enough that the tool digs in and locks the spindle dead from 
several hundred revs in just 2 to 5 degrees of rotation. As you can 
imagine thats also broken drive parts up to and including a bent gear 
shaft in the backgear.  Because of this, I intend to bore the bolt hole 
for the toolpost about 3/4" off-center so that I can displace the 
toolpost to the right, pulling the tool tip back into a position where 
it has carriage enough under it to prevent this tipping even if the gib 
might allow a couple thou's motion.

But I want a plain metal block, and will goto the re-cyclers place today 
looking for a starter piece to make this from.

If one of you had a choice of a block of cast iron this 3" diameter, 1.6" 
thick piece could be carved out of, or a piece of bar steel of unk 
additives but likely 1065, both in the iron pile, which would you use? 

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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[Emc-users] JT for president

[W. Martinjak]

The 7i90HD needs just 10 Days from the swamps in Michigan to the valleys in the 
Alps.
Best service ever.

Thanks JT!

BR matsche

-- 
"In der Wissenschaft siegt nie eine neue Theorie,
nur ihre Gegner sterben nach und nach"

Max Planck


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