Hi All,
I have built a custom CNC router.
In external features (e.g. bosses) I manage to hit tolerances of +/- 0.05mm
In internal features (e.g. holes / pockets) I get a poor tolerance of negative ~0.2mm (they always come out smaller than designed).
Anyone has any suggestions about why that might be?
Some details of the machine:
- Aluminium extrusion frame built
- Ball screws + Linear rails (cheap aliexpress stuff)
- 2.2kW spindle
- Closed loop NEMA 24 steppers
- GRBL controller + UGS + CAM in Fusion 360
- Tested material: Delrin
- Cutter: 6mm single flute