pic: 696 Teaser 1

[Cory]

Originally Posted by sanddrag

Yeah, a chamfer I could run at 40 IPM but the corner rounder I usually run at about 12. The long run time may be due to the 10% step over and the machine acceleration/deceleration on all the HSM moves. Iirc, the inside pockets ran about 13 minutes. I ran the bearing bores rather slow, and probably spent too much time going helical around through air with a plunge clearance of too high. What speed do you helix in and what helix ramp angle?

My strategy with gearbox plates is to not pocket and to contour slugs that drop out. You have to do this in the vise operation before you bolt it to your toolplate though.

At any rate I don't think HSM is gaining you much there. You could easily run 40% stepover full depth at 6k RPM and 54 IPM and only be limited by the rigidity of your machine, which I think would be fine. I routinely run those same parameters except at 10k RPM and 100 IPM.

I try to pre-drill plunge points for all my pockets whenever possible, to avoid potential edge chipping during plunging or the added time of helical entry. When I do helix I use the feed speed and 2-3*.