Hi, I'm having some issues with non repeatability. I shall explain:

X0 (Ref 0 in the software)
X15 (In inches)
X0

Cutter head moves 15" to the right, stops and returns to zero, but it doesn't. It says 0 in the software but the cutter head stops short by about 0.25". Similar situation with the Y and Z axis.

Hema 23 motors, standard driver boards, Mach 3 software (obviously), timing belt for X/Y axis, lead screw for Z axis.

So what am I doing wrong?

Sounds like you could be loosing steps because your max. Velocity / Acceleration is set too high.

Add the line;

G01 F30

to the start of your Gcode. Does this resolve the issue ?

Tweakie.

Thanks, I'll give it a try and let you know.

Love your profile pic.

You may need to calibrate your motors to get the proper settings

Tweakie is right adding a feed line should help isolate were the problem is

Hi everyone

I have solved the issue: I had the step pulse far too short (I used the default of 3) and the number of steps per inch way too high, this must have resulted in lost pulses. Changing these settings, along with changing the feed rate and acceleration has resulted in repeatable results and a much smoother operation.

Thanks for your suggestions, no doubt I'll be asking more questions in the future.

Cheers and a happy new year to you all

Peter