Richard.
Member
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- 18,347
- Location
- Cambridgeshire
How much of it have you got sticking out of the chuck unsupported? Drill a centre into the exposed face and run your tail stock up its backside to see if that helps. On mine it will not turn nicely at all if I have any more than 3" of bar that diameter unsupported from the chuck. Obviously other things can contribute to a finish like that.
Tool condition, tool centre, feed speed over rpm, material hardness as mentioned above.
Tool condition, tool centre, feed speed over rpm, material hardness as mentioned above.