Originally Posted by
joeavaerage
Hi,
I've had pretty good results with acrylic. It does not absorb moisture and remains flat after machining. It is very inclined to gum up tools
when its cutting, being very heat sensitive, so I use flood cooling, thereafter it cuts fine.
Acrylic is one of the cheapest plastics so you can afford to get a thick piece thereby avoiding distortion when cutting.
Acetal is my go to material for making parts, it cuts well, again with coolant, and remains dimensionally stable with minimal water adsorption.
PEEK is also good but both Acetal and PEEK are both quite pricey, great for small parts, for larger parts cost becomes an issue.
Craig