Hello everyone i am new to the forum and new to CNC as well. I got a basic C Beam Router from openbuilds and today i broke 2 carbide 1/8in bits tryng to mill a 1/8inch deep 6061 aluminum plate.

Rpm was 13.000 , and feed rate around 700mm/min SFM around 150 and cuts mostly 0.4mm deep. The bit was a good quality carbide bit 3 flutes for aluminum from BitsBits.

2 of them broke during sloting and it looked like the aluminum was melting into the spoilboard. I put a picture of what happened. The sound was very rough like it was struggling to cut and vibrating.

I am thinking to increase the rpm to 20K and SFM as well but i am afraid of breaking another beat. The machine is capable of milling this kind of plates as ive seen videos doing just fine. So anyone would suggest something ?

Thanks for the help !! Mistakes get quite expansive on cnc ????