dalt.deuel
Plastic
- Joined
- Apr 19, 2018
Hey guys (and gals) I am cutting 4140 Steel 28 Rockwell C-Scale Hardness. Unfortunately I have to use an 1/8" EM for roughing and to no surprise I am having a lot of trouble breaking End Mills.
I am curious as to what style End Mill I should be using?
Currently I am using a:
GARR Carbide 4-Flute 1/8" SQ x 1/2 F/L *TiALN*
My gut is telling me this is 100% the wrong type of End Mill to be using.
I was thinking something more along the lines of
Carbide 2 Flute (or 3 Flute) 1/8" .030 Rad x 1/2 F/L (Not sure coating matter?)
My DOC is .020" with S7500 F3. (Max RPM for my Haas) the pocket I am running is .180". The tool will break mid-cut, also sometimes right when it makes contact with the steel, it varies. Some tooling will last for 15 parts and other tooling breaks on the first tool.
I have slowed it to a F3. from F7. b/c I continue to break the tool.
Anything helps!
P.S. I am getting ample amount of coolant on the tool!
I am curious as to what style End Mill I should be using?
Currently I am using a:
GARR Carbide 4-Flute 1/8" SQ x 1/2 F/L *TiALN*
My gut is telling me this is 100% the wrong type of End Mill to be using.
I was thinking something more along the lines of
Carbide 2 Flute (or 3 Flute) 1/8" .030 Rad x 1/2 F/L (Not sure coating matter?)
My DOC is .020" with S7500 F3. (Max RPM for my Haas) the pocket I am running is .180". The tool will break mid-cut, also sometimes right when it makes contact with the steel, it varies. Some tooling will last for 15 parts and other tooling breaks on the first tool.
I have slowed it to a F3. from F7. b/c I continue to break the tool.
Anything helps!
P.S. I am getting ample amount of coolant on the tool!