2691
General Mach Discussion / Re: Machine not always following Mach3
« on: November 27, 2016, 02:25:45 AM »
I don't have enough to go on so it is just guesses...
Guess 1.
Problems like this can result from Gcode files which do not fully meet the Mach3 criteria with respect to Modal commands.
Mach initially starts and runs just fine but when it shuts down it saves the current state of the Modal commands ready for the next run. If these commands are not re-set correctly at the start of the Gcode file then problems can arise. Check you Gcode file to ensure G90 / G91 (for example) commands are properly specified.
Guess 2.
One or more of your axes are stalling and loosing position. Check (in Motor Tuning) that your Velocity settings are no higher than 70% of the stall speed and that your Acceleration figure is 10% of the Velocity figure.
Tweakie.
Guess 1.
Problems like this can result from Gcode files which do not fully meet the Mach3 criteria with respect to Modal commands.
Mach initially starts and runs just fine but when it shuts down it saves the current state of the Modal commands ready for the next run. If these commands are not re-set correctly at the start of the Gcode file then problems can arise. Check you Gcode file to ensure G90 / G91 (for example) commands are properly specified.
Guess 2.
One or more of your axes are stalling and loosing position. Check (in Motor Tuning) that your Velocity settings are no higher than 70% of the stall speed and that your Acceleration figure is 10% of the Velocity figure.
Tweakie.