Plasticwork

[mitchejc]

Yep I suspect something like that will work a lot better than the standard 2 flute HSS slot drills I've tried. Not sure about the feeds for the 3.175 cutters but if I recall correctly I got ok'ish results in HDPE with something like 12,000rpm 2000mm/min and 2mm DOC and sprayed with WD40 with the cheap 6mm cutters. I stuffed around with a piece of acetal at some stage and from my little experience it cuts a lot easier and neater than nylon. I think acetal might be the same as delrin but don't take my word for it.

[Boyan Silyavski]

read post 13 http://www.mycncuk.com/threads/7666-...9535#post59535

these are good starting points for excelent finish. Play with the depth of cut, depending on your machine stiffness and cooling. Blowing air into the cutter from old fridge compressor helps greatly increase the depth of cut. You should have nice chip if you use very sharp polished cutter, which is a must with plastics.

[jimbo_cnc]

I haven't learnt much about RPM, feed, doc yet, because everything I try works! I love Acetal.

I could keep cranking up the speed and doc I suppose, but I'm doing small one-offs mostly. 3 hours designing and drawing, 10 mins setting up. 5 mins cutting.

When I get into batch production I will look more at speeds.

[Boyan Silyavski]

http://zero-divide.net/?page=fswizard or maybe even his payed version HSM advisor, which i have installed from a couple of day and i like it very much.

Its not a question of production or no, its a question of quality finish, saving the tools to last longer and reasonable time when doing something 3D.