[SEL] OT lathe tooling for copper facing.

[Dave Otto]

Hi Curt

I use Sandvik TCGX series inserts for nonferrous turning. They are a
triangle insert with a center hole. They have a real aggressive top rake and
are honed to a very sharp edge. They leave a wonderful finish on parts. 

I use them on all nonferrous metals including brass and bronze. I even use
them on leaded steel and free machining 303 SS.

One other option may be a PCD Poly-Crystalline Diamond insert. We used to
use these to machine die cast aluminum hubs for disk drive motors. The
finish was pretty close to a mirror. The diamonds don't take abuse well, but
if taken care of will last a long time. 

We would send our dull inserts out for regrinding. These inserts were TPG
with a top clamp type holder.

Dave


No, the piston isn't finished yet. It is roughed out and waiting for the
finial bore size then I can finish the OD. cut the ring groove and put the
pin hole in.

The rocker arms are finished and came out great.

I need to do an up date to my Webshots page.




> -----Original Message-----
> From: sel-bounces at lists.stationary-engine.com [mailto:sel-
> bounces at lists.stationary-engine.com] On Behalf Of Curt
> Sent: Friday, January 12, 2007 8:22 AM
> To: SEL; SEL (Oldengine.org)
> Subject: [SEL] OT lathe tooling for copper facing.
> 
> Fellow machinists, a lathe tooling question for you.....
> 
> When using carbide insert tool holders, how does one determine when to
> use negative rake vs. positive rake tool holders?
> Are triangled inserts the best for facing? Or would round be better? Or
> some other shape?
> 
> MSC doesn't have a lot of small clamp style indexable tools. The shank
> will need to be 7/16 square with an overall length of 3".
> 
> Will be facing copper samples in our lab here at work. Want the
> smoothest, brightest surface possible to lessen hand polishing after
> turning.....
> Curt Holland
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