On 07/02/18 18:34, Jim Wilkins wrote:
"Ed Huntress" wrote in message
...
On Wed, 7 Feb 2018 10:13:10 -0700, Bob La Londe
wrote:

So, who has used one? Seems to me that if the insert and tool holder
can
take the cutting force it should be able to give a pretty good
finish
even with a pretty aggressive feed.
It does. You just need a pretty solid setup so the tool doesn't
skate.
It applies a lot of pressure to the workpiece.

I had a few samples I got from Valenite, I think, in micrograin
carbide amd with a sharp edge. I could cut mild steel with them on
my
old SB lathe. But most round inserts aren't so free-cutting.

--
Ed Huntress
I ground some half-round HSS bits to cut wire rope grooves in aluminum
and stainless pulley sheaves, which I made narrower and larger in
diameter than commercial pulleys for fiber rope. They do leave a
smooth finish but I had to wiggle them back and forth to reduce the
chip width instead of plunging straight in, or they would chatter
excessively on my old SB.
-jsw


While my Harrison M300 will take a fair cut and the largest radius bit I
have is 8mm radius these days when I make the likes of bending formers
for my rotary draw tube bender I use the rotary table on the BP as it is
far easier and less prone to issues.