problem cutting threads in stainless 304 or 303 3

[PlasticRD]

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

 

[unclesyd]

How are you trying to cut the threads?

 

[PlasticRD]

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..

 

[unclesyd]

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/

 

[PlasticRD]

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!

 

[NickE]

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.

 

[strokersix]

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.