I have a Shopsabre 4814. I've been cutting 3/16 ABS sheets for a plastics fabricator. My question is what size and type of bit is best for ABS and what spindle speed and feed rate is best. With all of my experimentation straight cutters work best and for some reason 1/4" seems to perform better then 3/8 or 1/2. I got the cleanest cut with a 1/4 single straight single flute but broke it so have been using the double 1/4. .
Any input would be appreciated.so

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