How do you know if you can go faster?
How do you know when you should slow the feed rate?
What is a good sound for a cut?
What do the chips look like?
spindle speed |
||||
feed rate | slower | faster | ||
faster |
cutter has too much chip load tool breakage spindle may stall |
fastest material removal rate | too fast: tool burns up | |
best tool life moderate material removal rate moderate surface finish |
better surface finish | |||
slower | older machines may prefer HSS tooling | feeding too slow: rubbing/poor tool life |
Legend for table above: Green is good, yellow is caution, red is not good
High feedrate, slow spindle - so the spindle stalls
High feedrate, fast spindle, - so the tool is likely to burn up