On 09/11/2011 11:57 AM, Kirk Wallace wrote:
> Well, I got lazy and used a common three point 60 degree carbide insert
> on some walnut at a maximum spindle speed of 3k RPM. There was some
> tear-out on one side where the grain might have been disagreeable, but
> it cleaned off very nicely with a little sand paper. I had to tweak the
> taper a little while I had the sand paper at hand, because I didn't
> bother using a center on the floppy end of the taper. The walnut cut
> with a smell similar to honey, which one doesn't often get in a machine
> shop.
>
> Too bad, even with the last string on, my playing doesn't sound any
> better.
>
Kirk,
I turn wood reel seat inserts all the time on my lathe. I use HSS,
and grind the cutting tool to a half-round or half-moon shape (make it
sorta look like the end of your thumbnail). Grind in a little relief
and then hone the edge sharp. You'll always get tear-out with carbide
tools, because you just can't seem to get them sharp enough. The big
radius on the cutting tool when it's sharp will cut the nastiest
hardwoods like buttah.
Mark
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