CNC Feeds and Speeds

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Tool direction

Conventional milling is more commonly used on softer materials, such as those used in the MDX-40. However, some hard plastics can respond better to climb milling.


If the tool speed (rpm) is too high, plastic can melt from tool friction. A rough surface finish, smell of molten plactic, or a lump of plastic stuck to the tool are all signs of this. Reduce tool speed to combat this. Reducing feed rate can also help.

Tested cutting parameters

These parameters have been used successfully in the past.

Material Tool diameter Flutes Tool speed (rpm) Feed rate (mm/s) Cut depth Tool direction Notes
ABS 2mm 2 4500 5 0.5 Conventional Slow, but no melting
HD polystyrene 6mm 2 4500 5 0.2 Conventional Slow, but no melting
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