| coolant was my thinking and if memory serves i did put the idea forward a few days ago (could be a week memory faids). Id think about using water with a few drops of washing up liquid to a pint. Styrene has a low melt point and plasticises very easily. A .5 cutter just wont transfer heat up the shank that fast so you will get heating. Also 20,000 rpm seems way too high for the material but about OK for the size of cutter. Drop your feed and your RPM by 25% and 50%.
The slot drill isnt perfect for the job your doing. try taking an old blunt cutter and grind it into a single flute or a D bar with no rake. can be done on a cutter that small with a diamond file. |