Homemade desktop CNC - cutting 0.8mm mild steel out the question?

[Robin Hewitt]

a degree of deburring will be in order... that last bit where the part is fully cut out from the material - it's tin helmet time.

Is the part particularly small? No possibility of running a couple of bolts through it?

If I had to guess I'd say the last .2mm of your tool is now exceedingly blunt and flex in the system is giving you a stop-go cut as it builds up a cutting pressure.

If you haven't got/can't use a bigger cutter I'd suggest, wind the speed down to about 1500rpm, the feed down to 60 mm/min or less, cut clearance on your sacrificial plate so can cut in one pass to a cut depth that uses the middle of the flutes and invest in a bottle of Rocol RTD liquid (apply generously) :naughty: