/diy/ - Do It Yourself

>>1581436
until this post i had no idea those thingies existed so take this with a grain of salt the size of a baseball, but single form threading looks to be about the worst possible setup for chattering.
spread some filings out on the part and tune the spindle speed up and down during the cut until you find a null spot in the resonance. on a large plate or a hollow casting that might be a different speed for every hole!