Need help with laser driver and TTL signal

[BRobbins]

Thanks for the fast reply.That pretty much reflects how I have mine hooked up. I've sorted everything out except for when I issue an S command there is a momentary pause that leaves a dot on my engraved lines. I've turned off spindle delays, turned of backlash compensation, turned up acceleration to ridiculouslyhigh levels and can't seen to get rid of this little pause. I am using the spindle speed/PWM to vary th laser power which works fine except for the pause. If you have any idea whats cauing this youd be saving me much banging of my head against the wall.

Can you post a small section of code?

[biqut2]

Here is the beginning of one test program:

G90
G0 X0 Y0
M3 S0
F1000
G91
S0
G0 X0 Y0.333 S0
G1 X.333 Y-.333 S20
S0
G0 X0.333 Y0 S0
G1 X-.667 Y.667 S20
S0
G0 X0 Y0.333 S0
G1 X.333 Y-.333 S20
X.667 Y-.667 S21
S0
G0 X0.333 Y0 S0
G1 X-.667 Y.667 S22
X-.667 Y.667 S21
S0
G0 X0 Y0.333 S0
G1 X.667 Y-.667 S21
X1 Y-1 S22
S0


Here is another that I tried:

G01X0Y0
S0
M3
F1500
S15 G2 R5 X10
G2 R5 X0
S0
M5
M30

The first one is code generated from a laser engraving program, the second was just written by hand to burn a circle. The first one just burns the crap out of everything because of the pauses, the second one burns dot where the circle ends.

[BRobbins]

Code should work. Sorry I can’t think of anything else now. I have a friend with a similar system and he too is running into some timing issues, a little different from you but still annoying . At some point we may try to put a scope on the signals to see if we can detect a delay, but for now, I too am stumped.

[biqut2]

Code should work. Sorry I can’t think of anything else now. I have a friend with a similar system and he too is running into some timing issues, a little different from you but still annoying . At some point we may try to put a scope on the signals to see if we can detect a delay, but for now, I too am stumped.

Ah well, thank you very much for taking a look.

[biqut2]

If anyone else stumbles upon this thread like I did looking for answers I've found a solution. It's late and I'll try to post the code and details tomorrow. Still working on processing raster images through mach3 though. That's going to take a little postprocessor magic.

[torkcm]

If anyone else stumbles upon this thread like I did looking for answers I've found a solution. It's late and I'll try to post the code and details tomorrow. Still working on processing raster images through mach3 though. That's going to take a little postprocessor magic.

I am in the process of setting up a similar laser with mach3 and a G540 controller, what was the solution? I know this is a few years back but hoping to find out what was the issue.