I m using MC7 to make some .3125 wide slots. A four flute uncoated .3125 carbide endmill 1. inch.deep. I have broken 3 endmills going from 2650 rpm to 3500 rpm at around 5 ipm (full depth) in A36 soft steel with flood cooling. I knew that wouldn't work but my boss saw a video........

I actually got 1 finished part by doing depth .100 cuts 1528 rpm and 5.1 IPM if I remember correctly.

What proceedures would you guys use with what tools?

Its NOT a good setup but it seems to be vibration free while running. Its an "L" shaped part kinda like a your hand with the fingers bent. The palm area is 5x5x1 and has four slots .3125 x 1 and the leg or your fingers has 2 slots. I have the palm resting on a square tube 13.5 inches high with the leg hanging down. There are 3 strap clamps holding it.

Hope I described it clearly. Thanks again for the help.

Yoda
PS
If anyone is near Sherman - Denison Texas and wants to meet up, let me know!!!!