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jfsmith
12-16-2002, 03:11 PM
I have used these stainless steels for a number of years making knives with my belt grinders, but I want to try to using my mill for a lot of the work. These are not HT's yet. So I have some questions;

1) Speed of the mill
2) HHS or carbide
3) Coolant/lube suggestions

Thanks in advance

Jerry

Thrud
12-16-2002, 11:05 PM
Jerry

You have asked for a simple answer to a complex question.

Exactly what type of tool? How hard is the material? How ridgid the set up? Dry or wet machining?

jfsmith
12-16-2002, 11:47 PM
Thrud,
I have a small drill/mill machine from HF, I have a variety of end mills. My knowledge

Here is what I founf on 440C a relative of the 440V steel

http://www.alleghenytechnologies.com/allvac/pages/Steel/UNSS44004.htm

http://www.crucibleservice.com/eselector/prodbyapp/stainless/cru440cs.html

I believe the hardness that is should with these specs is after hardening and tempering. The raw steel, is a little gummy to work with, when using belt grinders. Whe it is hardened, it like Rockwell 57 or about.

Jerry

Thrud
12-18-2002, 08:09 AM
Jerry

With carbide tools 440 quenched & tempered should be run around 100-400 SFPM or 1500rpm, 15ipm feed with a 2 flute .2500" endmill minimum .oo5" DOC (calculated on a .oo5" fpt).

With HSS 1/2 or 1/4 that rpm.

DOC will depend on available HP.

Either way, use coolant or apply cutting lube and use a very sharp endmill.

jfsmith
12-18-2002, 04:01 PM
Thrud,
I will try your suggestions this evening. Many thanks,

Jerry

jfsmith
12-18-2002, 07:28 PM
Thrud,
Your suggestion works, I varied the speed a little and HHS end mills.

Many thanks,


Jerry