440c ss

[HEAVY METAL]

i have been going thru alot of inserts trying to machine this stuff. i am using a carboloy 2.0 turbo mill.any suggestions on speeds and feeds or different cutters. i started out about 400 sfm and .005 fpt this was out of the carboloy book. the corners are not breaking but appear to be wearing off

happy holidays

heavy m

[Jim Whipple]

Is your insert coated? My first thought would be to increase the feed a bit. maybe .007 or .008 per ....

HTH

Jim

[McRae]

If the edge is "Wearing" off, then the carbide grade is too soft for the cutting speed.

 

Go with something more wear resistant.

 

Other suggestions is to drop the spindle speed and increase the feed to .007 or more per tooth. Watch the spindle load though!

 

When in doubt, abuse the "Test Kit" program that tool salesmen have.

[ROB]

are you running it with coolant?

[McRae]

Good point on the coolant. The failure mode sounds like the cutting edge may like to have some coolant to flush chips etc...

 

Here is one for you, look at the chips and see if the edges are smooth, or are they ragged and burned looking. Stainless should peel off with a nice shinny side to it. My all time favorite for this would be Iscar's 328 - Old technology but a problem solver.

[Jim Whipple]

My all time favorite for this would be Iscar's 328 - Old technology but a problem solver.

 

I'm going after some right now for a Ti job!!

Jim

[McRae]

Watch out - TiAlN is the coating on 328 so if the customer is alright by that then use it. Some insist on Uncoated tools to machine Ti. James should have a definitive opinion for this one.

[Toby]

Heavy Metal,

We have had a good measure of success in sst with Mil-Tec shellmill cutters. You could easily increase the surface footage to approx (550-900) and chiploads (.007-.012).

[Jim Whipple]

quote:

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Watch out - TiAlN is the coating on 328 so if the customer is alright by that then use it

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It's OK...we make reference standards for NDT. Not really a part

Jim