My prefered end mill for HDPE is an Onsrud O flute. I normally cut at 13,000 RPM, 40 IPM, 3/8 DOC using a 1/4 inch bit.
O Flutes For Mechanical Plastics | Documents
Hey there I’m a newbie to the CNC world. I am going to be cutting out 3/4” HDPE parts. What would you recommend for the best 1/4” endmill. What feed rate and spindle speed should I start at with said end mill. Any help would be appreciated.
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My prefered end mill for HDPE is an Onsrud O flute. I normally cut at 13,000 RPM, 40 IPM, 3/8 DOC using a 1/4 inch bit.
O Flutes For Mechanical Plastics | Documents
Jim Dawson
Sandy, Oregon, USA
Up or down cut?
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Or straight cut?
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I use an upcut. A straight flute doesn't shear the way a spiral flute does, you need the shearing action for a decent cut and proper chip formation. An alternative bit is the 2 flute, solid carbide router bits from Home Depot (Diablo) or Lowes (Bosch), both work well, and are available on a Sunday afternoon
Jim Dawson
Sandy, Oregon, USA
So the onsrud 63 series. What is different from 63-724,725,726...?
Jim Dawson
Sandy, Oregon, USA
Forget it I found the chart. So 63-725 should work for a 3/4” depth. Right?
Thank you for your help Jim. How about cutting 1/4” aluminum? What do you use for that?
Jim Dawson
Sandy, Oregon, USA
I got a little trigger happy and ordered 2 of the 725s. I’ll give them a try and if I need to, I’ll get the 726. 1 1/4” seemed like a big jump.
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