My cuts are clean but I’m busting bits too quickly for my settings to be right.
I am very likely being too ambitious with my feed rates and DOC when using 1/16 end mills, but I want a little better resolution than what I get with a 1/8 endmill so I need help because I can’t make a 1/16 end mill last more than 5 minutes.
This is me cutting 6mm lexan…
Spindle is approx 20k RPM using a DW660 and a rheostat.
2 flute up-cut 1/16 end mill
Feed rate 20mm/sec
Plunge rate 6mm/sec
My calculations say to run around 30mm/sec and the bit simply is not going to hold up to that. I am skittish in slowing down the spindle speed because the rheostat cuts voltage and that builds heat in the motor. It is my understanding that going too slow makes for a less clean cut in lexan.
So I’d love to hear what others are using or where you think I’m screwing up.
The following should be a link to the video: