How far to be off tool centre before a turned finish becomes poor?

[blowlampParticipant @blowlamp]

[mark costello 1Participant @markcostello1]

Across the pond some of us use pallet strapping as shims, some is .020, some is .023, and the biggest is .030.

[Anonymous]

Not only might the tool deflect slightly downwards the work may try and climb over the tool. There seems to be some aversion to setting the tool slightly too high. Depending upon the offset and work diameter it may not matter in the slightest. If a tool is set 10 thou too high and the work is 1" diameter then the tool will be 0.0001" closer than if it was set dead on height. I can't see a tenth of thou having any affect at all on the cutting process.

I suspect that finish problems are mostly caused by the material, cheap tooling or incorrect grinding, and wrong speeds and feeds. Tool height is probably some way down the list.

Andrew

[Philip PowellParticipant @philippowell34749]

Posted by mark costello 1 on 15/12/2018 14:49:56:

Across the pond some of us use pallet strapping as shims, some is .020, some is .023, and the biggest is .030.

Useful stuff that pallet strapping it's made from some kind of springy steel. I use slightly bent as a parallel retainer on the mill.

Phil.

[Author]

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