Technical Tip of the Week: Upcut and Downcut CNC router bits
Feb 15,  · Downcut spiral tools are best used for thinner materials which will be pushed down into the machine bed rather than being lifted with an upcut spiral. This can be particularly useful when using vacuum hold down where maintaining the seal . Sep 10,  · An up spiral will clear chips from a non through hole, but might cause surface fibres to tearout at the router face of the surface. Should leave a good surface Up Spiral Bit Vs Down Spiral Bit Water at he tip end of the job once it penetrates through. A down spiral will push chips into into the recess and pack Spiral Bits Upcut Downcut them in there during a non through cut, soneeds shallow cuts and frequent clearing of waste. Aug 20,  · Some of the shavings do tend to build up in the hole sometime, but no worse than a straight bit, at least in my experience. Of course, if you weren’t using a table, just the router, you would need the up spiral or your mortise would Up Spiral Bit Vs Down Spiral Bit Name really fill up with shavings. Either one gives a cleaner cut than any straight bit I’ve tried.

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