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Re: Machining plastics with CNC
I think you'll find that UHMW will machine very easily and consistently on a router- though you may find you have to deburr edges with a knife. Sanders create this problem sometimes, though I'm not sure what a router would do. PVC I have no experience with, but I do know that ABS machines easily as well- but I doubt you can get the material you need for your budget.
In the same line of thinking, Lexan is an excellent material choice and machines wonderfully on a CNC router, but is expensive as well.
I think you'll find CNC with plastic is a very easy and forgiving thing most of the time.
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