well first thing Sat. morning i melted my new cutter. Then i was left with the longer length cutter. I need to get used to this high speed machining because there is no time to react. I cut the feed and speed down but i left the depth to deep and the cutter failed.(1700 rpm....20 ipm.. .350 depth) I should have cut the depth down to .2-.25 ???
now i am just taking lighter cuts with the long endmill .075 @1600 rpm @13.5imp. I mounted an air line on machine to keep chips clear and i just walk away and let it run. It takes about 2 1/2 hours to cut the part. Not as fast as i wopuld like but i need to get the job done asap because the customer is in a bind and i can't risk losing this cutter. But still it is 50 inches of 2.25 thick steel being cut.
How does one really learn speeds and feeds vrs depth of cut....is it just experience. 15 years of manual machining..went more by feel than theory. That doesn't seem to hold as true with cnc.. |