compression Tool

[hockeyguy1]

I just bought my first compression bite router. 1/8 dia/ with a 1/8 collet. I am not sure how deep to set the cut. I am cutting plastic almost like ABS 1/4 thick. I typically have been using a down cut bit and cutting at .315 depth and it work ok! I have a spoil board underneath made from MDF so it is pretty soft as as well. The up cut portion of the bit is .218 inch. Do i have to cut past the up cut portion. Currently i am cutting .065 into my spoil board. if i am getting burring on the top of the piece i suspect i need to go deeper into the cut to eliminate that.

I am not sure how much of a cut i can take?? or if the rpm should be higher and feed rate slower? Sense it is plastic i think i should be able to go deeper and slow the feed rate down.
Any suggestions would be great.

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[ger21]

Compression bits are made to cut in one pass, but if you want to make multiple passes, the first pass should be deeper then the upcut portion, so at least .22. If you are going to cut .22, you might as well cut all the way through. I'd just cut .26" deep. No need to go so deep into the spoilboard.

With plastic, you want lower rpm's and higher feedrates, to prevent melting. Can't give you a recommendation, as I've never used a 1/8" compression bit.