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flatheadmurre · 11-07-2019, 08:48 AM

The problem isn´t that the bit can´t cut through the hard material.
It´s that the load on the lathe is different when the bit hit´s a hardspot it moves away under the increased load.
Even a $250 CBN insert at high speed does this...then it depends on how bad your hardpots are...
Same goes for grinding if you just go hard at it and don´t let it spark out at the end...

11-07-2019, 08:48 AM	#7
flatheadmurre Senior Member Join Date: Apr 2015 Location: Sweden Posts: 3,045	Re: Clutch chatter.... The problem isn´t that the bit can´t cut through the hard material. It´s that the load on the lathe is different when the bit hit´s a hardspot it moves away under the increased load. Even a $250 CBN insert at high speed does this...then it depends on how bad your hardpots are... Same goes for grinding if you just go hard at it and don´t let it spark out at the end...