Guest
Show Posts
1
General Mach Discussion / Steppers and mach out of sync
« on: March 05, 2011, 05:28:33 AM »
Hey,
I have just built my own CNC mill from scratch. but i have found a problem that i cant seem to solve.
to cut a long story short my x axis which is directly driven by a leadscrew will not consistently match up with the DRO readings in mach 3.
for a start, my motors are running at 200 steps/rev, driving a 1.5mm leadscrew, controller is set to 1/8 microstep. which works out to be 1066.6 steps per mm. but moving the axis 100mm on mach 3 will only physically move the gantry about 80mm. i have played around and found a number that will move it almost exactly 100mm (some fine tuning needed) but when i went back to it the next day to fine tune it, the steps per mm were still the same as what i had programmed it to the day before but it was moving 20mm more!
i cant think of any other way to describe this problem but ill answer any questions u have for more information.
please help. its getting very frustrating! lol
I have just built my own CNC mill from scratch. but i have found a problem that i cant seem to solve.
to cut a long story short my x axis which is directly driven by a leadscrew will not consistently match up with the DRO readings in mach 3.
for a start, my motors are running at 200 steps/rev, driving a 1.5mm leadscrew, controller is set to 1/8 microstep. which works out to be 1066.6 steps per mm. but moving the axis 100mm on mach 3 will only physically move the gantry about 80mm. i have played around and found a number that will move it almost exactly 100mm (some fine tuning needed) but when i went back to it the next day to fine tune it, the steps per mm were still the same as what i had programmed it to the day before but it was moving 20mm more!
i cant think of any other way to describe this problem but ill answer any questions u have for more information.
please help. its getting very frustrating! lol