The cut is always out between .2 and .4 mm undersize
The steps have been set, there is no steps being dropped and no noticeable backlash, and the z axis is rock solid.
I set the steps with a 900mm rule, and checked the settings by moving the x axis about 10 times while holding it back with all my strength. still spot on.
I have checked the 6mm bit and I use aspire for the code.
I have made 25mm, 50mm and 100mm square pockets, 25mm 50mm 75mm slots, they are all out 0.2 to 0.4mm
I have tried Mach3 and Uccnc, both the same.
UC300-lpt5 motion controller and HG08 Breakout card
Stepper motors are direct drive, onto 2005 ballscrews (2 on x axis linked not slave), with dial gauges at the x and y homes (just to check)
I have even tried cutting slots, like for a guitar fret board
35.64 equated to 35.98
33.64 equated to 33.86
31.75 equated to 32.00
not much cop for guitar fretboards
I have looked at other threads and site but no real fixes
Any Ideas?