Machine: LaserSaur with a bastardized grbl shield on an Arduino Uno.
Board: Cohesion3D LaserBoard (what I’m trying to install)
Firmware: Probably smoothie as I don’t need raster much.
Problem/ Question: Just working through what I have now, in terms of wiring, and trying to correlate all that with the LaserBoard hookup. Much of this is just a sanity check before I dig in.
The LaserSaur has GeckoDrive G203V external drivers. Unlike the suggested external drivers, these don’t have differential signal pairs. Just Disable, Step, and Direction.
Looking at Laserboard pinout or simplified schematic it seems that the + pins of those differential pairs are just steady 5V anyways. So, to confirm, I can just not use those wires with my external drivers, correct?
The G203V has a
disable pin vs
enable on the external drives sold on the C3D store. According to the G203V docs, 5V on the
disable pin will disable the steppers. I could not find specific docs on the C3D external driver but on others I’ve found it looks like they are disabled when that pin is low, not high like what I have Assuming I am correct, is there a way to flip that logic in Smoothie so that my external drivers work as is?
Sadly I’m not seeing any config option in the smoothieware config options docs.
LaserBoard Connecting External Steppers says to set the microsteps to 1/16 microstepping. Is there a specific reason for this other than that’s what the default smoothie config is setup to use? The G203V is locked at a weird 1/10 microstepping (2000 steps/rev) and cannot be changed.
Mechanically I have 5mm pitch belts with 12 tooth pulleys. So, given the 2000 steps/rev, I should be able to set
beta_steps_per_mm to 33.3333 in the smoothie config. But just wanted to confirm there wasn’t a reason for the given 1/16 microstepping.
Granted, this is assuming I can somehow make the G203V drivers work and am stuck with 2000 steps/rev.
My machine has a DY13 laser power supply and has both active high and active low control. Pretty sure I only need hook up Laser Ground and Laser Fire, but can you confirm that Laser Fire is active high?
You’ve got CAD models for the previous controller boards but I could not find any for the LaserBoard. Any place I can find that? I need to fabricate a new mount for this controller.
Worst case, I’ll just get close with calipers, but always nice to have a full model or dimensional drawing
Thanks! That’s it really. Everything else looks straight forward.