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Finding tool centre height on a lathe

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bogstandard:
Nick,

I have absolutely no idea. I suppose these replaceable tip people came up with an idea that works, and that is how it is. A few normal turning tools are like that as well. Maybe one of the tip experts can let us in on the secret.

All my boring bars with changeable tips are like that. Luckily, 90% of my tipped tooling use the same cheap tip, so I don't argue, it does the job just fine when set to centre height, so I use them.

John

Stilldrillin:
The negative raked tips have a chipbreaker groove around them.

The chipbreaker`s cutting edge meets the metal at the correct angle.......  :thumbup:

Usually!

David D

ozzie46:


  Thanks John, I'll Look into it on this side of the pond.


 Ron

28ten:
Slightly  :offtopic: I have been thinking of trying one of those parting tools, as my attempts at parting on the mini lathe have been less that satisfactory. I removed the QCTP as that was flexing something 'orrible.
I like the last bit about using a known tool  :thumbup: something to remember when I get a decent QCTP

bogstandard:
David,

The boring bars I use actually use the same tips as my normal tools, which are at the normal rake angle, and as you stated, do have a chipbreaker groove.
Why they set the boring bars down like that I have no idea, when they work perfectly well at normal angles. There must be a reason for it, but ??????????????????


John

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