Hi folks,
I am getting started in the CNC world and I am struggling with understanding how to determine feeds and speeds. I have milled several parts with a NON-Ferrous 4tooth 1/4" endmill and it has done a pretty good job. I am running it at 6000rpm and about 20ipm at a 1/8" depth of cut .0032" chip load. It seemed to run really well and it had a pretty good finish but about 10 parts in I noticed a little chip out of the very bottom so it will still work but my tolerance is off on a hole around 015" or .007" per side. So I had an old HSS 4flute 1/4" endmill laying around that I tried and at these same settings I welded it to the part.
Can someone just push me to getting my initial settings figured out so I can calculate the other parts of the equations? There are so many different takes out there that I cannot figure out a basic starting point to get the correct settings. Also most everything I machine is mild steel.