Re: [Emc-users] Cutting tool fingernail style need

[Marcus Bowman]

On 20 Feb 2016, at 02:31, Gene Heskett wrote:

> Greetings all;
> 
> I am not haveing any luck finding one smaller than 3/8 radius, and I need 
> one that cuts with a 1/8" radius.
> 
> Any body know of a place I might be able to source one that small?
> 
Not sure where might be close to you, but I have one which I got at a local 
wood turners' store. It is a 1/8inch gouge tool, but I made it into something 
more like a fingernail tool by grinding. I just copied the shape of one of my 
larger fingernail gouges. With a tool that small in section, it needs support 
close to the cutting edge, because I find mine prone to chatter unless the rest 
is set close in. I would be inclined to fix it in a 5/8inch sleeve machined 
with a tapered nose.

I can also highly recommend the Drozda Finial Gouge, which takes things a stage 
further. Cuts beautifully when used by hand. You can buy one here:
http://www.cindydrozda.com/html/Tool_Info.html

but I bought the DVD which shows you how to make one (too far away for the 
expensive carriage on the tool to make sense). There is a youTube video around 
which shows much the same thing, I think. There used to be a clip on the Drozda 
site, as I recall.

Marcus


> A fingernail bit is not quite a beading bit as the ends of the cutters 
> are at a 90 degree angle to each other, 45 degrees off axis for both 
> upper and lower "wings".  I need to roundover the ends of these trim 
> pieces, but do it in 3d by tipping the vise 45 degrees so the meeting 
> line of two curves is horizontal and I can then cut a curve of the same 
> radius as if a 1/8" roundover was used.  But since its two curves 
> meeting, and LCNC can't cut a 3d curve, I don't see another way to do it 
> without the fingernail style tool.
> 
> Thanks everybody.
> 
> 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] Cutting tool fingernail style need

[Gene Heskett]

Greetings all;

I am not haveing any luck finding one smaller than 3/8 radius, and I need 
one that cuts with a 1/8" radius.

Any body know of a place I might be able to source one that small?

A fingernail bit is not quite a beading bit as the ends of the cutters 
are at a 90 degree angle to each other, 45 degrees off axis for both 
upper and lower "wings".  I need to roundover the ends of these trim 
pieces, but do it in 3d by tipping the vise 45 degrees so the meeting 
line of two curves is horizontal and I can then cut a curve of the same 
radius as if a 1/8" roundover was used.  But since its two curves 
meeting, and LCNC can't cut a 3d curve, I don't see another way to do it 
without the fingernail style tool.

Thanks everybody.

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] Pyngcgui questions

[tom-emc]

> On Feb 19, 2016, at 1:11 PM, Dewey Garrett  wrote:
> 
>> ...
>> Is there a way to make them appear as vertical list?
> no

Thanks Dewey.  I found the .py file and modified the “make_entryfields" 
function to set the number of rows equal to the number of parameters.  That way 
there is one row per parameter and they all fall down a single column.   A 
hack, but it works.  

Also, why couldn’t the subroutine parameters area be set to a 
gtk.ScrolledWindow rather than a gtk.Frame so as to at least allow one to 
scroll if the parameters go off the screen?

-Tom


See “My Edit:” below -

   def make_entryfields(self,nparms):
   self.no _of_entries = nparms
   # make VBoxes as required to accomodate entries
   # destroy them when starting over -- this occurs
   # when a OnePg is reused for a different subfile
   try:
   type(self.columnbox) # test for existence
   # destroy prior VBoxes packed in self.boxofcolumns
   for c in self.boxofcolumns.children():
self.boxofcolumns.remove(c)
c.destroy()
del(c)
   except AttributeError:
   # first-time: create initial VBox for entries
   self.columnbox = gtk.VBox(homogeneous=0,spacing=2)

   self.boxofcolumns.pack_start(self.columnbox)

   # try to use minimum height if less than 3 columns
   if nparms > 20:
# My Edit:
   rowmax = nparms
   #rowmax = 10
   else:
# My Edit:
   rowmax = nparms
   #rowmax  = int(nparms/2 + 0.5)

   self.pentries = {}
   row  = 0
   idx  = 1 # 1-based to agree with parm no.s
   for i in range(0,nparms):
   if row >= rowmax:
   row = 0
   # make a new VBox for next column of entries
   self.columnbox = gtk.VBox(homogeneous=0,spacing=2)
   self.boxofcolumns.pack_start(self.columnbox)
   self.pentries[idx] = OneParmEntry('','','')
   self.columnbox.pack_start(self.pentries[idx].box
,expand=0,fill=0,padding=0)
   row += 1
   idx += 1
   self.boxofcolumns.show_all()
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Re: [Emc-users] Linear / glass Scales

[Jon Elson]

On 02/19/2016 10:54 AM, Ralph Stirling wrote:
> I'm very intrigued by these Inductosyns.  I assume
> the several hundred mA drive is an AC waveform.
> What frequency is used?
In general, whatever you want, but for the AD2S1200 chip I 
use in my converter board, it is 10KHz,
sine wave.
>Obviously an amplifier is
> needed for the drive side.  Do you also need an amp
> on the sense side?
For a transformer-type resolver, they generally have ratios 
between 1:2 and 2:1, so a little range of excitation levels 
gets you the required output.  Inductosyns have such low 
turns coupling (the sense windings only cover a small 
fraction of the spar's winding) plus a big air gap, that the 
sensed signals are really weak.  So, you have to add an 
amplifier to the sense side.
>These appear to be two-phase
> (quadrature).  Aren't resolvers generally three-phase?
>
No, resolvers are unrolled control transformers, and are 
2-phase (sine and cosine).
Selsyns are 3-phase.

Jon


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Re: [Emc-users] Pyngcgui questions

[Dewey Garrett]

> I was wishing there was a python version and google told me it was
> already there!  

pyngcgui is mentioned in the documentation, for example:
http://linuxcnc.org/docs/2.7/html/gui/ngcgui.html#_standalone_pyngcgui

> When I run it standalone and click "Finalize" nothing appears
> in Axis.  What is missing?

$ pyngcgui --help

For standalone usage with the axis gui try:
$ pyngcgui --sendtoaxis

> ...
> Is there a way to make them appear as vertical list?
no

Notes:
1. If using a rip build, you must source the rip-environment script when
   starting linuxcnc _and_ in the terminal used to start a related, stand-alone
   application like pyngcgui.

2. The --height option mentioned with --help was removed but the --help
   message needs to be updated to remove the mention (will amend soon).
-- 
Dewey Garrett


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[Emc-users] Pyngcgui questions

[tom-emc]

I just discovered Pyngcgui.  I’ve been using standalone ngcgui for a while.  
Little nits about it’s UI have always driven me crazy.  Mostly that if my 
cursor drifts out of the tiny box when entering values it loses focus.  I was 
wishing there was a python version and google told me it was already there!  
Yay.

When I run it standalone and click “Finalize" nothing appears in Axis.  What is 
missing?

When I run it in a tab in Axis, iit does post results in Axis,but I can’t see 
all the parameters I need to enter because I have limited screen real estate 
(mostly width) and Axis and my Glade side panel truncate the Pyngcgui window a 
bit.   It would be nice if the parameters for a each subroutine could be made a 
vertical list rather than vertical AND horizontal as they are now.  I tried 
editing the .ui file in glade-gtk2 but I don’t see the actual parameters or 
entry boxes for them, just a place holder for the subroutine parameters.  Is 
there a way to make them appear as vertical list?

-Tom


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Re: [Emc-users] Linear / glass Scales

[Ralph Stirling]

I'm very intrigued by these Inductosyns.  I assume
the several hundred mA drive is an AC waveform.
What frequency is used?  Obviously an amplifier is
needed for the drive side.  Do you also need an amp
on the sense side?  These appear to be two-phase
(quadrature).  Aren't resolvers generally three-phase?

-- Ralph


From: Jon Elson [el...@pico-systems.com]
Sent: Thursday, February 18, 2016 6:23 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Linear / glass Scales

On 02/18/2016 01:23 PM, Nicklas Karlsson wrote:
> Do you know accuracy of the linear resolvers?
>
> I guess it would be possible to position an ordinary disc read head quite 
> accurate. Either one for DVD/CD or magnetic. How many bits are stored per 
> turn?
>
>
>
GE pin scales are fairly low resolution, they work by
varying reluctance of a stack of gauge pins passing between
excitation and pickup coils.  But, you might still get
~33,000 counts/inch, I think.

Inductosyns are pretty simple in concept, a plate with two
sections of serpentine PCB tracks, with them set up with a
90 degree shift between the two.  And, a spar with a
continuous serpentine running the whole length.  Then, you
have to drive several hundred mA through the spar.  With a
bit of an amplifier, you could get this to work with my
(Pico Systems) resolver converter board.  If the serpentine
repeated every .1", then you'd get 40960 counts/inch.
But, that might be too fine a pattern, requiring the two PC
boards to be awfully close.

Jon

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Re: [Emc-users] Mesa 5i25 firmware - is there a mistake?

[Viesturs Lācis]

2016-02-19 0:13 GMT+02:00 Peter C. Wallace :
>
> I dont think there are any common 5 axis pinouts that match parallel port
> breakouts, but if you are not aiming at a parallel port compatible pinout, you
> might be able to use a 7I76 pinout. It has 5 stepgens and if the other options
> (like sserial and encoder) are explicitedly disabled in the config line, all
> the free pins shoud be usable for GPIO
>

I _think_ that I have to stick with parallel port compatible pinout -
that breakout board has optoisolators, so pins 1-9, 14,16, 17 can be
used as outputs only, 10-13, 15 as inputs only. The machine is about
80 km from me and I do not have spare 5i25 to check, which pins are
used for stepgen signals. I would gladly keep that breakout board just
for sake of protecting 5i25 board...
Is there any chance to convince you for a quick hack to adjust that
g540 firmware to include also dir pin? It does not matter, on which
particular parport pin it would go, I will rewire accordingly.

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