Another project using our MPCNC. Not quite as successful.
Attempting to carve a small scale replica of the face from an Egyptian coffin (https://skfb.ly/ICXY) in cheap pine. Used a 3.7 mm ball nose end mill, 1 mm DOC, 15mm/sec feed rate and 20% step over for roughing passes.
Things were going very well as can be seen in photo. About 60% into the roughing, the MPCNC plunged into the material about 8mm as can be seen in the lower left. Guess I’m going to have to take apart the Z assembly and take off the backlash nut as recommended in other posts 🙁