"Jon Elson" wrote in message
...
Pete Keillor wrote:


Thanks for the input, Jon. I was trying to say conventional doesn't
seem to recut chips on a horizontal as much as I'd suspect an end mill
in a pocket would. Gunner disagreed. I also said I wouldn't try climb
milling on a bet on this mill, because the leadscrew is way too worn.
As a matter of fact, the acme thread looks like a sharp v on top in
the middle of the screw. Screw and nuts need replacing bad, and will
be.
Oh, MY! Yes, that's pretty bad wear. Also, a lot of differential
wear makes measuring off the screw pretty inaccurate, less a problem
on the X axis of a horizontal, but sometimes you need to stop at a
particular spot.

Yes, I pretty much agree with Gunner, climb really improves surface
finish,
especially on Aluminum, and also helps protect the cutting edges.
With conventional, the tooth slides across the just-cut surface until
the pressure increases enough to punch through and start cutting.
With climb, the tooth hits the un-cut edge and immediately plunges
into the cut. This causes less wear. It also cleanly slices any
chips that spun around on the cutter.



Take rounging cuts conventional then snug your table lock and lightly climb
cut for a finish pass.