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Thread: Which plastics are hard and soft for Onsrud O-flute bits

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05-05-2021, 01:44 PM #1
scott216

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Which plastics are hard and soft for Onsrud O-flute bits

Onsrud has their O-flue design. Some bits say they are for hard plastic, some are for soft. I can't find anywhere where Onsrud defines what is hard and soft. Anyone know?

--Scott

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05-05-2021, 03:14 PM #2
difalkner

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Re: Which plastics are hard and soft for Onsrud O-flute bits

Cast acrylic machines easily but stay away from extruded. Extruded tends to melt but cast cuts like wood or aluminum.

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05-05-2021, 09:44 PM #3
Bob_Valentine

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Re: Which plastics are hard and soft for Onsrud O-flute bits

Both types of acrylic (Cast and Extruded), Polypropylene, Polycarbonate, anything with an epoxy resin, and Bakelite are some types of hard plastics (I recommend the spiral down cutter for the Bakelite, spiral up cutter for all others unless they are 1/8" thick or less).
HDPE, LDPE, sintra, and "cutting board" plastic (not sure the exact name for this type of plastic) are considered soft plastics. I have had some good success running pretty quickly through both hard and soft plastics using the the hard plastic cutters from LMT Onsrud and Techno CNC Systems. Hope this is helpful.

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