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General Mach Discussion / GoTo Zero not working
« on: April 14, 2018, 05:35:03 AM »
Hi All.
My new machine is up and running, but there's a few niggles :-(
When I hit GOTO ZERO in Mach3 the steppers on X and Y scream and although there's some movement, the spindle does not move to the correct position.
Z-axis behaves correctly.
Motor tuning (as per manufacturer) as follows:
Steps per: 320
Velocity: 4000
Accel: 300
Step Pulse: 0
Dir Pulse: 0
If I jog the X/Y axis using computer arrow keys, the unit moves smoothly and without problems at 4000mm per minute.
When I use "Ref All Home" function, it also moves smoothly and without problems.
When I change the Velocity down to 1000 things get "slightly" better.
The unit does move back to zero position, but it does it in a pulsing movement in stead of a smooth movement.
But this does not really solve the problem, as everything is very slow like this.
With some experimenting I found some other interesting behaviour as well:
When I execute this command
Same problem: screaming steppers, pulsing movement.
But if I execute this:
the machine works perfectly fine (smooth movement). I dont understand why turning the spindle on makes the G0 command work differently.
I'm new to Mach3 and GCode, so I have no idea if this is normal behaviour, the CNC machine or Mach3 being the problem.
Any insights will be greatly appreciated.
My new machine is up and running, but there's a few niggles :-(
When I hit GOTO ZERO in Mach3 the steppers on X and Y scream and although there's some movement, the spindle does not move to the correct position.
Z-axis behaves correctly.
Motor tuning (as per manufacturer) as follows:
Steps per: 320
Velocity: 4000
Accel: 300
Step Pulse: 0
Dir Pulse: 0
If I jog the X/Y axis using computer arrow keys, the unit moves smoothly and without problems at 4000mm per minute.
When I use "Ref All Home" function, it also moves smoothly and without problems.
When I change the Velocity down to 1000 things get "slightly" better.
The unit does move back to zero position, but it does it in a pulsing movement in stead of a smooth movement.
But this does not really solve the problem, as everything is very slow like this.
With some experimenting I found some other interesting behaviour as well:
When I execute this command
Code: [Select]
G0 X0 Y0Same problem: screaming steppers, pulsing movement.
But if I execute this:
Code: [Select]
M03 S15000
G0 X0 Y0the machine works perfectly fine (smooth movement). I dont understand why turning the spindle on makes the G0 command work differently.
I'm new to Mach3 and GCode, so I have no idea if this is normal behaviour, the CNC machine or Mach3 being the problem.
Any insights will be greatly appreciated.
