On Tue, 14 Feb 2012 18:04:33 -0600, you wrote: > This is just a simple prototype, using available material, but it is >also a educational process, as I tried turning off a seized, and welded >bearing race, but none of my carbide tooling would make much more than a >few tiny cuts in it, before they were destroyed. I'm assuming that CBN, >or PCD inserts would be the only way to turn it off? (And yes, I tried >the grind, and chisel thing first.. all I did was make a mess, and break >a chisel.)
You were likely taking too small a cut and rubbing the insert to death rather than cutting with it :) Minimum 150 thou depth of cut, 7-10 thou feed or so at 450rpm. Chips should come off brown to blue. If it's sparking, up the feed until it just stops. A 2HP lathe should be able to handle that. Even C2 inserts will machine pre hardened 4140 at the correct feeds/speeds. If you can, use flood coolant, if not run dry - don't squirt oil on occasionally, all your likely to do is thermal crack the insert. Steve Blackmore -- ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
