I am in the process of rebuilding a 1994 ULS 25PS laser cutter (24"x18" bed). The original power supply is dead and is integrated into the stepper motor driver board. Switcher IC is long obsolete and though about just wiring in external supplies. But even if i got that going and there was no other collateral damage to the other boards I still have drivers, processors, and software from 1994...
So instead decided to just scrap all the current electronics and update to EMC (well linuxCNC is what you guys call it now
. Been watching this thread for a while but only hit and miss. So just trying to get caught up on the state of things.
What I need is:
- 4 axis (looks like it supports 4)
Z (going with a TB6600 4.5A driver)
2x [email protected]
Y,R (going with a pair of TB6560 3A drivers)
2.5V$0.6A X (again going with the TB6560 3A driver just because i can get them for cheaper than the pololu and has a MUCH easier heat sink mounting system. Also tossing the idea of adding a extruder head at some point so it can do double duty which would require a larger stepper motor as well.)
- 4 home switches (looks like it supports 4)
- spindle on/off for the laser (more on this later)
and that is about it. From the looks of things PICnc should have me covered other than some safety stuff (water, air, lids, etc can wire in series with the enable output and feed a status bit back via other GPIO) and laser power setting (Plan to control via I2C directly from the Pi. This is changed once per setup and does not need to even be in the Gcode)
Can anyone think of anything I am missing that would cause PICnc not to be a good fit for this project. More or less a normal 3 or 4 axis machine with the exception of Raster engraving. For my raster engraving planning on trying to use Graster (http://wiki.linuxcnc.org/cgi-bin/wiki.p ... th_A_Laser
) Sounds like it will work with just what I have above but have not dug into all the details yet. (need to get this thing moving first.)
So anyone see any glaring issues at this point?
If not where is the best place to get the PICnc firmware and LinuxCNC files? Does anyone have a install guide for dummies for the LinuxCNC software? (on the PIC end I use a lot of the 8 and 16 bit parts at work so quite familiar with programming them with the pickit 3)
My plan is to build a small custom breakout board that takes 24V in from my main power supply and generates the 5V (3.3V?) to run the PICnc and Pi. It will also support the signal conditioning to the laser supply and interlocks.