Re: [Emc-users] Plasma

[Viesturs Lācis]

2012/6/28 Yishin Li :
> Then we realized that we need an isolated
> pulse/encoder interface for such machine.

Thanks! Could You, please, explain a little more, what does it exactly do?

> Nice machine! Just, I heard significant motor noise from the video. Is it
> driven by open-loop stepper motors?

Yes, those are open-loop stepper motors. I _think_ that it even has
software step generation, but I am not sure.

-- 
Viesturs

If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] Total OT: spam from my domain

[Dave]

On 6/25/2012 2:27 AM, Viesturs Lācis wrote:
> Hello, folks!
>
> First of all, I apologize for the total non-LinuxCNC topic.
> This is the only place I know, where some people might have related
> experience...
>
> I have my own domain and I have my mailboxes with my domain in Google Apps.
> Today in spam folder I see "mail delivery failure", "undelivered mail
> returned" messages from different places. I can see in the text of the
> message the original sender, which has my domain after @ symbol (and
> different names before it, like Deanne021 or Victor812 etc).
> I am administrator of my Google Apps account and I myself have created
> only one user and only one mailbox - I just checked it in Google Apps
> administration page.
> I have set that I receive all the messages with my domain after @
> symbol, regardless of what word is before that.
>
> Does this mean that I have been hacked?
> Or can anyone simply fake the original sender entry and there is
> nothing I can do?
>
> Thanks!
>
>


I have a couple of domains and they are on a server that sits on a DSL 
line. I use a dynamic DNS setup to direct traffic to the server.
I use it as a low volume web server and for email collection.
The DSL connection does not allow mail to be sent from a SMTP server 
sitting on their DSL lines. I tried to circumvent their filters but they 
really have it locked down.
Still, I get stuff in my inbox - perhaps 20 messages per week saying 
that the messages that I sent were returned. This has been going on for 
years.
I send mail out on a secured SMTP server that is remote.
I still get hackers into that server trying to set it up so they can 
send messages, but it simply is not possible.
Some of these hackers have way too much time on their hands!
 From what I see I would not be surprised if 90% of the email traffic on 
the web these days is spam.

Dave

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Re: [Emc-users] How to test original Bridgeport Series I CNC Mill

[Jon Elson]

Igor Chudov wrote:
> Secondly, is my recollection correct that EMC2 is easily capable of running
> such a machine?
>
> Would one need to replace stepper drives or can they be used with, say, Jon
> Elson's system?
>   
The motors are a bit klunky, but serviceable.  Typically, they are 11 A 
motors,
though.  The stock Bridgeport drives are GHASTLY, and you would be doing
everybody a favor by trashing them.  They are full-step drives with no 
current
control.  They use a magnetic amplifier to switch between idle current and
running current.  Many people have had fairly good luck with Gecko stepper
drives, or there are apparently Leadshine (China) drives that can give
rated current and handle higher voltage.

If you try to use the stock drives, you need to provide 4 signals per 
axis, although
they are complementary pairs, so inverters can turn the wave drive into the
4 signals.  Then, you need to provide the High-low current selection to 
the transistor
for the mag amp based on whether the motor is below creeping speed or moving
rapidly.

Jon

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Re: [Emc-users] Status of Ubuntu 12.04 port?

[Sebastian Kuzminsky]

On 06/27/2012 07:03 PM, Igor Chudov wrote:
> Sorry if this question was asked. No hurry on my part, I do not like 12.04
> that much, 10.04 was perfect for me. But I am wondering if EMC2 will be
> ported to Ubuntu 12.04?

LinuxCNC currently runs on Ubuntu 12.04 in Simulation mode only.  Debs 
in the usual places.

LinuxCNC realtime requires RTAI, and it has not been ported to Linux 3.2 
(the Ubuntu 12.04 kernel), so LinuxCNC realtime can't run on "normal" 
Ubuntu 12.04.

It is possible to run Ubuntu 12.04 with the RTAI kernel from 10.04 
(Linux 2.6.32), and in that case you can compile LinuxCNC from source 
and run it.  You get the 12.04 userspace on the 10.04 kernel, so no new 
hardware support, just new userspace tools.

http://permalink.gmane.org/gmane.linux.distributions.emc.user/34836

-- 
Sebastian Kuzminsky


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Re: [Emc-users] Status of Linux-emc and 3d printing?

[Jon Elson]

> On Wednesday 27 June 2012 14:04:15 John Stewart did opine:
>
>   
>> Hi all;
>>
>> Noted lots of interest in 3D printing, and have saved the emails.
>>
>> 
Michael Joyce just completed a kickstarter project for a 3D
printer, he got $510,000 in one month.  He now has to deliver
about 180 systems.  This is the b9creator project.
A lot of discussion of this type machine has been going on on
the Yahoo group :
diy_3d_printing_and_fabricat...@yahoogroups.com

The basic idea is a vat of photosensitive resin and a build
platform that raises above the vat.  A DLP-type computer
projector shines through the bottom of the vat to expose a
layer at a time, which is made planar by the vat bottom.
A guy in Spain is providing relatively inexpensive resins.
Software has been modified from the standard reprap software
preview mode.  The last problems that Michael solved was
preventing the model from sticking to the vat bottom (a clear
silicone similar to RTV was used) and preventing a suction
cup effect (his scheme is to have a plateau of the silicone
for the build area and slide the model sideways to a lower
area of the floor to prevent suction.)

The advantage of this machine is it exposes an entire
layer in parallel, and has about an 8-10 second cycle time,
regardless of layer complexity.  Pixels of 50 - 100 um
are typical, and layer thicknesses of 20 - 50 um are
what they are using, I think.

Pretty much all the details have been hashed out on that
group.

Jon

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Re: [Emc-users] How to test original Bridgeport Series I CNC Mill

[Matthew Herd]

Igor,

I have a Boss 5 still running the original control.  Assuming you're feeding it 
3 phase power, you press the E-stop override button (like you've done) and the 
light should go out.  Then make sure that you're in "setup" mode on the rotary 
switch at the top right of the panel.  Then you should be able to jog the axes. 
 I have the manuals, but only in paper format.  I'm happy to answer any 
questions you might have.  Obviously, it's unlikely that more than one axis has 
a blown transistor, so if at least one of them doesn't run, then there may be 
something else wrong.

It's also worth mentioning that if you're using a rotary phase converter, it's 
important that the generated phase not feed the stepper power supply.  The 
generated voltage is too high, overloading the stepper drive and blowing 
transistors.  I believe it's connected to L1 & L2 but you'll have to confirm.  
When I first installed the machine, I went through 2 or 3 transistors before 
figuring this out.

With respect to conversions, I understand that a breakout board can be used to 
adapt the machine to EMC2, but can't say what additional hardware might be 
required.  Someone else will have to speak to that.

I don't have three phase power, so I'm doing the total retrofit (excepting 
steppers), with Gecko 203V's, Antek 70VDC power supply & 240 to 120V stepdown 
transformer, a VFD, and a Pico Systems USC board.  I plan to control the 
original air motor for the varispeed drive, wire up the original lube pump, and 
the coolant/spray mister relay with EMC.  I have yet to begin the conversion, 
so I'm not sure what challenges I will encounter.

Matt
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Re: [Emc-users] Status of Linux-emc and 3d printing?

[Stephen Dubovsky]

Some of us already HAVE machines w/ high speed travels;)  Hossmachine
claims his X3 sized mill does 300ipm (and others videos report similar) =
127mm/s.
http://www.youtube.com/watch?v=3639EIzUc6w

What are the acceleration rates on the dedicated machines?  That might be
more of a factor w/ the back and forth fill that the slicers appear to
generate.  The dedicated machines will prob have the advantage there.

SMD

On Wed, Jun 27, 2012 at 8:34 PM, Ed Nisley  wrote:

> On Wed, 2012-06-27 at 12:17 -0400, John Stewart wrote:
> > as I have a perfectly good CNC mill sitting around…
>
> The fundamental problem with a RepStrap made from a typical milling
> machine is speed: my rather customized Thing-O-Matic prints reasonably
> well at 30 mm/s and makes rapid motions at 250 mm/s.
>
> That's about 70 in/min printing and 600 in/min moving, which seems
> rather peppy for most affordable milling machines.
>
> At those speeds, an "interesting" object requires upwards of a half hour
> to print, with the largest one taking (IIRC) four hours.
>
> Tuned Ultimakers seem to have the fastest printing these days, somewhere
> upwards of 150 mm/s; call it 350 in/min.
>
> You can scale the total time pretty much linearly by the printing speed,
> because that's what it spends most of its time doing. My Sherline,
> admittedly a slug, tops out at 24 in/min = 10 mm/s, so larger objects
> would require a bit over three consecutive shifts.
>
> That's why you need a purpose-built 3D printer...
>
> --
> Ed
> http://softsolder.com
>
>
>
>
>
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[Emc-users] Status of Ubuntu 12.04 port?

[Igor Chudov]

Sorry if this question was asked. No hurry on my part, I do not like 12.04
that much, 10.04 was perfect for me. But I am wondering if EMC2 will be
ported to Ubuntu 12.04?
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Re: [Emc-users] Status of Linux-emc and 3d printing?

[Ed Nisley]

On Wed, 2012-06-27 at 12:17 -0400, John Stewart wrote:
> as I have a perfectly good CNC mill sitting around…

The fundamental problem with a RepStrap made from a typical milling
machine is speed: my rather customized Thing-O-Matic prints reasonably
well at 30 mm/s and makes rapid motions at 250 mm/s.

That's about 70 in/min printing and 600 in/min moving, which seems
rather peppy for most affordable milling machines.

At those speeds, an "interesting" object requires upwards of a half hour
to print, with the largest one taking (IIRC) four hours.

Tuned Ultimakers seem to have the fastest printing these days, somewhere
upwards of 150 mm/s; call it 350 in/min.

You can scale the total time pretty much linearly by the printing speed,
because that's what it spends most of its time doing. My Sherline,
admittedly a slug, tops out at 24 in/min = 10 mm/s, so larger objects
would require a bit over three consecutive shifts.

That's why you need a purpose-built 3D printer...

-- 
Ed
http://softsolder.com




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Re: [Emc-users] XY Scanner Galvos

[Ralph Stirling]

I just came across this post while looking for something
completely different.  Looks like a nice galvo setup
driven by LinuxCNC.

http://www.cnczone.com/forums/general_electronics_discussion/150487-as5311_encoder_2_%B5_very.html#post1087824

-- Ralph

From: Jeshua Lacock [jes...@3dtopo.com]
Sent: Tuesday, June 26, 2012 9:42 PM
To: Enhanced Machine Controller (EMC)
Subject: [Emc-users] XY Scanner Galvos

Greetings,

Has anyone used servo motors with mirrors as scanner galvos using LinuxCNC to 
drive them? Or possibly a polygonal mirror with an encoder?

If not, can it be done? Seems like with the kinematics it should be possible.

I imagine for high resolution over a relatively large area (at least 1m square) 
the servo would have to be geared down quite a bit - maybe around 100:1.

Any insight into this topic would be greatly appreciated!


Thanks,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated

Phone: 208.462.4171


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Re: [Emc-users] Plasma

[Yishin Li]

On Thu, Jun 28, 2012 at 12:18 AM, Viesturs Lācis
wrote:

>
>  1) use shielded cables for encoders AND for motor power; shield is
> grounded only on one end of cable, most probably the drive end;
>

We use Mitsubishi J2S servo drivers for plasma machines. Its encoder cable
is shielded, while its power cable is not. We had EMI issues with servo
drivers at beginning. Then we realized that we need an isolated
pulse/encoder interface for such machine. So, we developed one, and it
solves the EMI issue.


> 2) connect the machine frame and all the moving constructions and
> everything possible to earth grounding;
> 3) route plasma cable separately from motor/encoder/signal/whatever
> cables wherever possible;
>

Those are correct wiring strategies for signal integrity.


> And last one - I would like to share a video of Anthony's 5 axis
> plasma cutting machine. I think that he has built very nice machine
> and I find his design of the rotary head to be very interesting (well,
> take a look at other of his videos for some closeups).
>
> The video shows the taper control module in action, running a
> testcode, consisting of 2 arcs.
> http://www.youtube.com/watch?v=myNtcNJBcTA


Nice machine! Just, I heard significant motor noise from the video. Is it
driven by open-loop stepper motors?

Yishin
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[Emc-users] How to test original Bridgeport Series I CNC Mill

[Igor Chudov]

I finally brought a Series I CNC  Bridgeport to my warehouse.

It does power up.

http://igor.chudov.com/tmp/Bridgeport-Series-1/

It does not complain of anything, however, I was pressing various
buttons and I could not get it to do anything, such as move in X, Y,
and Z.

I did take it out of E-Stop.

I am wondering if anyone has a manual for it, or a simple instruction
like "press this and then press that button" to just get it to move
and move the spindle.

Secondly, is my recollection correct that EMC2 is easily capable of running
such a machine?

Would one need to replace stepper drives or can they be used with, say, Jon
Elson's system?

I would love it if someone said "I used boards A,B,C and it was easy". Kind
of like for my own Series II Interact 2, I used Jon's controller board and
AMC servo drives and it was "easy". (BG)

i
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Re: [Emc-users] Status of Linux-emc and 3d printing?

[Alex Hunt]

There is a page buried in their wiki: http://reprap.org/wiki/EMCRepRap
The 'EMC' and 'EMC2' are dead ends.

I don't think it has been updated much lately.  I have been very guilty of
not adding my knowledge to that page, but I know I won't be getting around
to it for weeks.

Alex


On Wed, Jun 27, 2012 at 12:37 PM, Ralph Stirling <
ralph.stirl...@wallawalla.edu> wrote:

> I think the point is that there should be a wiki page started
> to collect all the info needed to easily bolt a plastic extruder
> to a 3-axis CNC machine do 3d printing.  I've played with this
> a bit a few months ago, and hope to get back to it this summer.
> I'd be happy to contribute content to the wiki page once I have
> something going.  At least collecting links to the several
> documented builds using linuxcnc would be helpful.
>
> -- Ralph
> 
> From: doug metzler [doug.metz...@gmail.com]
> Sent: Wednesday, June 27, 2012 9:55 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Status of Linux-emc and 3d printing?
>
> Why would anyone who owns a mill buy a reprap kit?  With your
> knowledge of linear motion you could build a far superior machine in
> an afternoon :-)
>
> DougM
>
>
> On Wed, Jun 27, 2012 at 9:17 AM, John Stewart  wrote:
> > Hi all;
> >
> > Noted lots of interest in 3D printing, and have saved the emails.
> >
> > I do find it a bit confusing, (RAMPS, Mendel, other new words) and am
> wondering if anyone is working on a web page to provide a "put an extruder
> in the spindle, and 3D print" web page for Linux-EMC?
> >
> > I keep thinking about pushing the "buy" button for a RepRap kit of
> parts, but as I have a perfectly good CNC mill sitting around…
> >
> >
> > ---
> > John A. Stewart
> > alex.stew...@crc.ca
> >
> >
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Re: [Emc-users] Status of Linux-emc and 3d printing?

[Gene Heskett]

On Wednesday 27 June 2012 14:04:15 John Stewart did opine:

> Hi all;
> 
> Noted lots of interest in 3D printing, and have saved the emails.
> 
> I do find it a bit confusing, (RAMPS, Mendel, other new words) and am
> wondering if anyone is working on a web page to provide a "put an
> extruder in the spindle, and 3D print" web page for Linux-EMC?
> 
> I keep thinking about pushing the "buy" button for a RepRap kit of
> parts, but as I have a perfectly good CNC mill sitting around…
> 
> 
> ---
> John A. Stewart
> alex.stew...@crc.ca
> 
I think I want to add an "..." to that myself.  Somewhat more complex than 
EDM which I have done, but ...


Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: 
Today is the tomorrow you worried about yesterday.

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Re: [Emc-users] Status of Linux-emc and 3d printing?

[Ralph Stirling]

I think the point is that there should be a wiki page started
to collect all the info needed to easily bolt a plastic extruder
to a 3-axis CNC machine do 3d printing.  I've played with this
a bit a few months ago, and hope to get back to it this summer.
I'd be happy to contribute content to the wiki page once I have
something going.  At least collecting links to the several
documented builds using linuxcnc would be helpful.

-- Ralph

From: doug metzler [doug.metz...@gmail.com]
Sent: Wednesday, June 27, 2012 9:55 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Status of Linux-emc and 3d printing?

Why would anyone who owns a mill buy a reprap kit?  With your
knowledge of linear motion you could build a far superior machine in
an afternoon :-)

DougM


On Wed, Jun 27, 2012 at 9:17 AM, John Stewart  wrote:
> Hi all;
>
> Noted lots of interest in 3D printing, and have saved the emails.
>
> I do find it a bit confusing, (RAMPS, Mendel, other new words) and am 
> wondering if anyone is working on a web page to provide a "put an extruder in 
> the spindle, and 3D print" web page for Linux-EMC?
>
> I keep thinking about pushing the "buy" button for a RepRap kit of parts, but 
> as I have a perfectly good CNC mill sitting around…
>
>
> ---
> John A. Stewart
> alex.stew...@crc.ca
>
> --
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Re: [Emc-users] AMC Sinusoidal Drive

[Jon Elson]

Todd Zuercher wrote:
> Has anyone here used some of these brushless sine drives (like an AMC
> SX25A20) that take two analog sine waves from the control (the 3rd is
> calculated from the other two)?  
>
>   
I got a couple of the equivalent Copley drive for a future retrofit.  
Note these are
torque-mode only drives, where the analog command input determines winding
current on two terminals.  (Of course, the 3rd terminal needs to equal 
the sum of
the other two.) 
>  
>
> What hardware did you use?   It seems like most hardware is aimed
> towards a single signal per drive.  I will need to use 4 drives and
> there for need 8 analog signals, 4 differential encoders, 4 halls (also
> differential like the encoders), 
>   
I believe a couple people have gotten this working with Mesa hardware 
and the
BLDC component.  I plan on using my own PPMC hardware, but the analog 
outputs
are not anything special, it is the HAL connections that determine what 
they do.

Jon

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Re: [Emc-users] Status of Linux-emc and 3d printing?

[doug metzler]

Why would anyone who owns a mill buy a reprap kit?  With your
knowledge of linear motion you could build a far superior machine in
an afternoon :-)

DougM


On Wed, Jun 27, 2012 at 9:17 AM, John Stewart  wrote:
> Hi all;
>
> Noted lots of interest in 3D printing, and have saved the emails.
>
> I do find it a bit confusing, (RAMPS, Mendel, other new words) and am 
> wondering if anyone is working on a web page to provide a "put an extruder in 
> the spindle, and 3D print" web page for Linux-EMC?
>
> I keep thinking about pushing the "buy" button for a RepRap kit of parts, but 
> as I have a perfectly good CNC mill sitting around…
>
>
> ---
> John A. Stewart
> alex.stew...@crc.ca
>
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Re: [Emc-users] Requesting suggestion about viability of a project

[Eugenio Yime Rodriguez]

2012/6/27 andy pugh 

> On 27 June 2012 13:41, Eugenio Yime Rodriguez 
> wrote:
>
> > * Is possible to use LinuxCNC with QNX ?.
>
> Anything is possible, but some things are more work than is worthwhile.
> What is the reason not to use the existing, supported  platform and CPU?
>
>
I just was looking for a small computer, and I found i.mx53 Quick Start
Board, very small with touchscreen. It runs linux and QNX, but there is no
ARM support in RTAI.


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> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
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Re: [Emc-users] Status of Linux-emc and 3d printing?

[Sebastian Kuzminsky]

On Jun 27, 2012, at 10:17 , John Stewart wrote:

> Hi all;
> 
> Noted lots of interest in 3D printing, and have saved the emails.
> 
> I do find it a bit confusing, (RAMPS, Mendel, other new words) and am 
> wondering if anyone is working on a web page to provide a "put an extruder in 
> the spindle, and 3D print" web page for Linux-EMC?
> 
> I keep thinking about pushing the "buy" button for a RepRap kit of parts, but 
> as I have a perfectly good CNC mill sitting around…

Anders Wallin did some experiments like that in 2010: 

http://www.anderswallin.net/2010/12/3d-printer-first-test/
http://www.anderswallin.net/2010/12/3d-printer-day-2/

I'm not sure what's happened since then...


-- 
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[Emc-users] Plasma

[Viesturs Lācis]

Hello, folks!

I have 3 small things.
First one is a question for any useful plasma-specific tips, when
designing plasma cutting machine. I just got a contract for building
one and I would appreciate a chance to learn from other people's
mistakes rather than my own.
Following things are on my to-do list:
1) use shielded cables for encoders AND for motor power; shield is
grounded only on one end of cable, most probably the drive end;
2) connect the machine frame and all the moving constructions and
everything possible to earth grounding;
3) route plasma cable separately from motor/encoder/signal/whatever
cables wherever possible;

I would appreciate, if plasma machine owners could share their
experience and some problem areas they have encountered, when
designing their machines.

Second question - I would appreciate some advices for good and
efficient downdraft table design. I have one brochure, where one
concept is shown, but, guess what, it is not very detailed. So maybe
there is some webpage with useful information on this matter.

And last one - I would like to share a video of Anthony's 5 axis
plasma cutting machine. I think that he has built very nice machine
and I find his design of the rotary head to be very interesting (well,
take a look at other of his videos for some closeups). Actually it
showed me a solution to the problem I encountered, when designed the
head for the waterjet.
I helped him out with 2 kinematics modules:
With the first module the machine can take the angle of torch tilt,
given in the g-code as A word, and keep the direction of the tilt
perpendicular to the XY movement. I do not know about plasmas, but for
waterjet this concept handles the kinematics for taper compensation.
The second is "usual" 5 axis module, which compensates for torch
length offset along x, y and z as the torch is rotated by rotary
joints.
Both kinematics modules will also adjust torch height along central
line of the torch instead of just moving along Z, which is crucial for
5 axis cutting.

The video shows the taper control module in action, running a
testcode, consisting of 2 arcs.
http://www.youtube.com/watch?v=myNtcNJBcTA

-- 
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http://www.ifixit.com/Manifesto

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[Emc-users] Status of Linux-emc and 3d printing?

[John Stewart]

Hi all;

Noted lots of interest in 3D printing, and have saved the emails.

I do find it a bit confusing, (RAMPS, Mendel, other new words) and am wondering 
if anyone is working on a web page to provide a "put an extruder in the 
spindle, and 3D print" web page for Linux-EMC?

I keep thinking about pushing the "buy" button for a RepRap kit of parts, but 
as I have a perfectly good CNC mill sitting around…


---
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alex.stew...@crc.ca

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[Emc-users] AMC Sinusoidal Drive

[Todd Zuercher]

Has anyone here used some of these brushless sine drives (like an AMC
SX25A20) that take two analog sine waves from the control (the 3rd is
calculated from the other two)?  

 

What hardware did you use?   It seems like most hardware is aimed
towards a single signal per drive.  I will need to use 4 drives and
there for need 8 analog signals, 4 differential encoders, 4 halls (also
differential like the encoders), 

 

Any one see a problem with using a Mesa 5i25 with 2 7i77s?  How hard
would this be to get working?

 

Todd Zuercher

P. Graham Dunn Inc.  

630 Henry Street 

Dalton, Ohio 44618

Phone:  (330)828-2105ext. 2031

 



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Re: [Emc-users] Requesting suggestion about viability of a project

[andy pugh]

On 27 June 2012 13:41, Eugenio Yime Rodriguez  wrote:

> * Is possible to use LinuxCNC with QNX ?.

Anything is possible, but some things are more work than is worthwhile.
What is the reason not to use the existing, supported  platform and CPU?

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[Emc-users] Requesting suggestion about viability of a project

[Eugenio Yime Rodriguez]

Hi everybody,

I would like to start a project with some of my students.

My thoughts is to use i.mx53 QSP with EMC2, but still there is no support
or RTAI for ARM, so I was thinking in QNX., so my question is:

* Is possible to use LinuxCNC with QNX ?.

Hardware and software:

- A i.mx53 Quick Start Board

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=IMX53QSB

- QNX OS and BSP

http://community.qnx.com/sf/wiki/do/viewPage/projects.bsp/wiki/FreescaleImx53Qst

Thanks in advance,



Eugenio

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