I'm trying to cut Aluminum Composite Material. I'm using an Onsrud 63-614 bit. It's a small 12"x7.5" mailbox sign I just want to cut out. I called Onsrud and they said do a 12000 RPM and Feed Rate of 54 on the small sign but it just rips the aluminum to pieces, it doesn't cut it clean. I tried 18000RPM and Feed Rate of 85 and 50 with the same results. I don't know how to get it to cut it and look good. I had them all set to a smooth ramp of .25" and I tried them in 1, 2, and 3 passes still no luck. My spindle has a mister. Any help is greatly appreciated.


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