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problem cutting threads in stainless 304 or 303
3

problem cutting threads in stainless 304 or 303

problem cutting threads in stainless 304 or 303

(OP)
I have been having a problem with 10-32 thread tearing while cutting 303 ro 304 Stainless steel. I have been using a mineral oil based cuttting fluid and cutting wax. I have vary steel all over the place without good results

RE: problem cutting threads in stainless 304 or 303

How are you trying to cut the threads?

RE: problem cutting threads in stainless 304 or 303

(OP)
I have been cutting the threades with a die. The threads I am cutting are from 1.5" to 2" long 10-32s. If I try single pointing them I get too much deflaction..

RE: problem cutting threads in stainless 304 or 303

You die needs to be High Speed Steel.
Make sure your die is very sharp.
Don't backtrack.
Keep going once you start.

I would try a lighter cutting fluid like Tap Magic.

http://www.tapmagic.com/


RE: problem cutting threads in stainless 304 or 303

(OP)
I am using a Greenfield die and cut them all in one shot (no back tracking) I haven't tryed Tap Magic, I really hate the smell!!, but I will try it, I have some in the shop. Thanks for the suggestion, very much appreciated!

RE: problem cutting threads in stainless 304 or 303

You almost have to use one of the smelly (sulfur) based tapping fluids on 300 series stainless. It works better because of the EP action of the sulfur compounds.

RE: problem cutting threads in stainless 304 or 303

You can single point them to slightly oversize, then run a nice sharp, high quality die to finish size.  You may also want to reduce the major diameter a bit so you don't have to cut off as much.  Should work great.   

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