"Cliff" wrote in message
...
On Thu, 17 Feb 2005 20:03:22 -0800, "PrecisionMachinisT"
wrote:


"Robert Salasidis" wrote in message
.. .

So the wiper insert - does it do anything for quality of finish (or
does it just allow faster feed rates - at the same level of quality)


Improved finish at same rates....

Chipload per tooth being pretty much the same, difference being that one
"wiper insert" has a "flat" bottom.......

That "bottom" needs to stick "up" out of the cutter body at least
as high as the high spots on the radiuses of the other inserts. But
not much higher.
Feedrate in IPR is good *almost* to one flat's worth of width per
Rev. assuming nothing else fails (and only one wiper insert in the
cutter body, the other inserts being standard types).

Anyone have a link to the formula for surface finish vs. IPT
vs. insert nose radius? It's also in Machinery's Handbook someplace
IIRC.
--
Cliff



Right out of Bill's calculator, copied from Sandvik technical help:

F = finish requirement represented as non decimal integer i.e. 32 or 63.
R = tool nose radius.

SQR((F*(8*R))/(10(sixth))

Can also be used for calculating step over amount when kellering with a ball
end mill.