Is there any type of bit or technique that prevents material from building up on a mill bit? I am basically drilling hundreds of 0.13" holes into HDPE and every 10-20 holes there is so much plastic built up on the mill bit(1/8" upcut) that it starts melting the plastic and I have to stop it to clean. By then the holes are all becoming cruddy from rewelding anyway. Then I restart and sometimes the holes are off. And either way, the surface is a mess.
I realize that slowing down the spindle will help *some* with the melting but it won't prevent the build up of plastic and eventual heat build up.
Any help please on techniques or special bits?