CNC Question

[Hao]

I was wondering what would be the ideal feed rate, spindle speed, and etc. for Denford machines while cutting styrofoam. I tried a few different rates but the surface finish didn't come out very smooth.

Thanks in advance.

[crazy^millman]

Well what type of foam is in Ren-board or is it the white stuff with small round balls in it?

[Hao]

I don't know exactly what the name of the foam is but according to my teacher it's just high density foam that's extremely common. Perhaps the feed rates and spindle speed for some very high density foam would work.

[Hao]

Um, I just saw on Google and they call it high density polystyrene foam.

[billystein]

i dont think you will have a problem with the surface speed. just keep it under the melting point. use the shortest cutters you can and if they are still too long then turn down the spindle speed. the material does not finish like metal because of porosity but i have never had had problems with the finish.

[Hao]

Ok thank you.

[ARP]

Watch your stepover amount. If you don't like the surface finish then make the stepover tighter.

[NEW2007]

Cutting direction must be counter-clockwise. Feederate 200 ipm or more. Spindle speed 18000.

Straight bit or up-spiral.

 

 

Eric Peng