Re: [Emc-users] off topic free mechanical movement software simulation

[Alex Hunt]

Linden,

Onshape (a web-based CAD tool) will let you link struts together and
simulate movement.  It's not able to script movement yet, but pushing
struts around with the mouse will reveal your rough estimate of work
envelope faster than a physical model.  It's also pretty easy to learn -
they have a lot of video tutorials for impatient amateurs like me.

Alex


On Sat, Oct 24, 2015 at 8:58 AM, N. Christopher Perry 
wrote:

> Linden,
>
> I'd probably start with Matlab or the open source version, Octave,  to
> work out the kinematics.  These numerical packages have some pretty
> powerful plotting and visualization tools that can be driven by numerical
> functions of your choosing.
>
> Once you work out the basic geometry l'd move to Solid works, FreeCAD or
> Solvespace to work out the component geometry.
>
> N. Christopher Perry
>
> > On Oct 24, 2015, at 9:19 AM, linden  wrote:
> >
> > Hi All
> > I have been playing with the idea of building a hexapod or
> > Stuart platform mill with linuxcnc for the control system.
> > What I need help with at this stage is the design of the joints and
> > length of the struts. I have a few designs in my head and sketched out
> > on paper and am looking to see if any one knows of a program i could use
> > to test various geometries before I started cutting metal and building
> > 100 small test models. This way at least I could get a rough estimate of
> > the expected work envelope and length of various components to do
> > further computer testing and modelling before committing to metal.
> > I have played a little in with blender but this is such a big
> > program with a steep learning curve geared more to animation. It has to
> > look right not be true in a mechanical sense. Any hints or suggestions
> > will be greatly appreciated.
> >
> > Thanks,
> >
> > linden
> >
> >
> >
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>
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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 alex.stew...@crc.ca 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…
 
 
  ---
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  alex.stew...@crc.ca
 
 
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Re: [Emc-users] OT: and Soapbox: 3D Printer Mods?

[Alex Hunt]

On Tue, Jun 5, 2012 at 2:08 AM, Joachim Franek joachim.fra...@pibf.dewrote:

   I am not sure how the slicing software handles the extruder stepper
 motor, but I would guess it is with G Code.
 http://www.reprap.org/wiki/EmcRepStrap
 My suggestion: we change the postprocessor of the slicing software to fit
 lcnc gcode requirements.


Both popular slicing programs (skeinforge and slic3r) treat the extruder as
an axis called 'E'.  This conflicts with LinuxCNC, but is easy to fix.
Each program has an option to rename the axis before the file is output.

In other words, I just have the extruder set up as the 'A' axis.  The
slicing software produces G-code with coordinated moves.  Aside from
calibrating the A axis to move 1mm of filament for 1degree of axis
movement, I've never had to bother with it.

Alex
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Re: [Emc-users] OT: 3D Printer Mods?

[Alex Hunt]

Hi Roland,

To the average machinist - ok, ALL machinists, the parts produced by
homebuilt FDM machines look awful.  There is visible banding along the
Z-axis, variations in the amount of plastic extruded, occasional slumping
at overhangs, and places where support material had to be snapped off.  If
you want to produce 'perfect' parts, the technology is not there yet.  (but
'junk' depends on your requirements for the parts, budget, and time
pressures)

That being said, FDM machines have several advantages that your milling
machine can't do.  The RepRap machines routinely produce hollow or
partially filled parts.  Some of them can print in multiple materials
(hard/rubbery, different colors, water soluble support material).  Most of
them (not mine) are portable.  They have very low material waste (I don't
have to vaccum up a big pile of chips when done).  They allow fixtureless,
one shot printing - no repositioning the workpiece and touching off.  In
general, they have a low machine cost (homebuilt).  They can produce nested
or high complexity parts using only three axis.  I can be printing while my
children are sleeping in the next room.

The bottom line?  If you already have access to high-end milling machines
and you are uninterested in the underlying technology, forget it.  You will
be disappointed with the results.  If you want a low cost entry point to
complex plastic shapes and quality is a secondary issue, give it a try -
but keep an open mind.

For me personally, I see an opportunity to contribute to an emerging
field.  I think it's worthwhile for that reason.

Alex
On May 30, 2012 2:52 AM, Roland Jollivet roland.jolli...@gmail.com
wrote:

 Hi Alex

 Do you mind saying what you are printing, and if you feel the printing is a
 worthwhile exercise? I've been looking at different printers for months,
 but they only seem to be able to produce junk. Cnc'ing it out of a block of
 plastic looks far more effective.

 Regards
 Roland


 On 29 May 2012 18:22, Alex Hunt al...@ieee.org wrote:

  Hi Jeshua,
 
  I mounted a Wade type extruder to my gantry router and have been 3D
  printing with LinuxCNC for about 6 months now.  The extruder thermal
  control is managed by RepRap firmware on an Arduino.  I have to manually
  set the temperature of the extruder before printing, but it works.  I
 have
  a Mesa 5i20 card for control with 2M542 motor drivers, but the extruder
  driver is a simple single chip stepper driver.
 
  My intent was to close the thermal loop with a thermocouple to PWM
 circuit,
  but I'm not there yet.  Sending serial port commands from LinuxCNC would
  automate my current setup better, so please let me know if you make any
  progress on that.
 
  When you get your hardware ready to go, I might be able to help you
 smooth
  over some of the speed-bumps getting started.
 
  Regards,
  Alex Hunt
 
  On Tue, May 29, 2012 at 12:00 AM, Jeshua Lacock jes...@3dtopo.com
 wrote:
 
  
   Greetings all,
  
   I have been dreaming of making a removable plastic extruder nozzle for
 my
   machine. It would turn it into a *huge* 3D printer.
  
   So I read this page with great interest:
  
   http://www.thingiverse.com/thing:5233
  
   Is it possible to make those changes to LinuxCNC? In other words, can
   LinuxCNC currently command a serial port using those additional M
 words?
  
   If not, I would be willing to write some code and commit it. Some
 advice
   to help me get started would be extremely helpful as I have never
 looked
  at
   the branch.
  
  
   Thanks,
  
   Jeshua Lacock
   Founder/Engineer
   3DTOPO Incorporated
   http://3DTOPO.com
   Phone: 208.462.4171
  
  
  
  
 
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Re: [Emc-users] 3D Printer Mods?

[Alex Hunt]

Hi Jeshua,

I mounted a Wade type extruder to my gantry router and have been 3D
printing with LinuxCNC for about 6 months now.  The extruder thermal
control is managed by RepRap firmware on an Arduino.  I have to manually
set the temperature of the extruder before printing, but it works.  I have
a Mesa 5i20 card for control with 2M542 motor drivers, but the extruder
driver is a simple single chip stepper driver.

My intent was to close the thermal loop with a thermocouple to PWM circuit,
but I'm not there yet.  Sending serial port commands from LinuxCNC would
automate my current setup better, so please let me know if you make any
progress on that.

When you get your hardware ready to go, I might be able to help you smooth
over some of the speed-bumps getting started.

Regards,
Alex Hunt

On Tue, May 29, 2012 at 12:00 AM, Jeshua Lacock jes...@3dtopo.com wrote:


 Greetings all,

 I have been dreaming of making a removable plastic extruder nozzle for my
 machine. It would turn it into a *huge* 3D printer.

 So I read this page with great interest:

 http://www.thingiverse.com/thing:5233

 Is it possible to make those changes to LinuxCNC? In other words, can
 LinuxCNC currently command a serial port using those additional M words?

 If not, I would be willing to write some code and commit it. Some advice
 to help me get started would be extremely helpful as I have never looked at
 the branch.


 Thanks,

 Jeshua Lacock
 Founder/Engineer
 3DTOPO Incorporated
 http://3DTOPO.com
 Phone: 208.462.4171



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Re: [Emc-users] 3D Printer Mods?

[Alex Hunt]

I am using a Duemilanove board.  The typical RepRap thermistor circuit and
a HEXFET for the heater coil is on a prototyping shield.  The firmware is
called teacup.

I got frustrated trying to get the serial port to work following the links
on that webpage, so I decided to go down the PWM route.

Alex
On May 29, 2012 11:36 AM, Joachim Franek joachim.fra...@pibf.de wrote:


 Joachim

 On Tuesday 29 May 2012 18:22:00 Alex Hunt wrote:
  I mounted a Wade type extruder to my gantry router and have been 3D
  printing with LinuxCNC for about 6 months now.  The extruder thermal
  control is managed by RepRap firmware on an Arduino.

 Which type of Arduino hardware do you use?

 see also:
 http://reprap.org/wiki/EMCRepRap

 Joachim




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Re: [Emc-users] Problem with RTAI on Ubuntu 8.04 HH and new EMC2 2.2.7

[Alex Hunt]

Roberto,

I have experienced this same issue with 8.04 installed from the live CD -
but it is occurring on EMC 2.2.6.  I haven't allowed the upgrade to 2.2.7 to
occur, but I did install all the critical  other apps.

I have found a work around - load EMC2 again!  I only get the rtai_hal.ko
file exists error the first time I try to run EMC after a reboot.  If I shut
it down and start it again, it loads.

Here are the error messages I see after a reboot:
http://pastebin.com/m12dbb0b6
Here is the dmesg list after a reboot:  http://pastebin.com/m23c28ffb
Here is the dmesg list after I load EMC, let it fail, close and re-open:
http://pastebin.com/m71e7e99b
(I'm still working on the unexpected real time delay on task 1)

I hope that is helpful.  I didn't report it before because I am very new to
EMC and I thought I was doing something wrong.

Oh, another random bit of information - this error also happens if I try to
load emc-trunk using run-in-place.

Alex


On Fri, Nov 14, 2008 at 9:58 AM, Eric H. Johnson [EMAIL PROTECTED]wrote:

 Roberto,

 I suspect what is happening is that the real time kernel is not the default
 kernel and the errors you are seeing are a consequence of not having a real
 time kernel loaded. You can select the kernel on boot, on some systems you
 may need to hit escape while grub is loading in order to select the kernel.
 The real time kernels will have 'rtai' in the name.

 To permanently change the default kernel, edit the file
 /boot/grub/menu.lst.

 I don't know why this has changed for HH, as far as what becomes the
 default
 kernel, but this question will continue to get asked until that is changed.

 Regards,
 Eric

 I have installed on my PC the Ubuntu 8.04 HH with EMC2 from the live cd
 from
 linuxcnc.org.
 After, i have updated my system to EMC 2.2.7 with the ubuntu update
 manager,
 so I have updated
 EMC2 and other 227 files (from critical update and other applications...).

 Now when I try to load EMC2 with sim configuration (but it happens with any
 configuration), the rtai doesn't be loaded with the following error:

 insmod: error inserting
 '/usr/realtime-2.6.24-16-rtai/modules/rtai_hal.ko' -1 File exists
 4891

 PID TTYSTAT TIME   COMMAND
 Stopping realtime threads
 Unloading hal components
 ERROR: Module rtai_math does not exists in /proc/modules
 ERROR: Module rtai_sched does not exists in /proc/modules
 ERROR: Module rtai_hal is in use by rtai_lxrt

 I don't know how it's possible, i have tryied to reboot the pc but
 nothing...
 I think that other applications use this rtai_lxrt but who is this???


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