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Spiral upcut vs down cut bits, help me understand - Power Tools - Wood Talk Online
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 13,  · Direction of spiral produces cleanest surface in the direction of the cut. For clean on both sides, you can get an up-down bit (typically edge work). For plunging, up-cut clears chips most efficiently, so heat is reduced, but you risk the top edge as it is unsupported. Up vs. Down Spiral (down on right) The major differences between up and down shear bits are the chip evacuation rate and the finish quality. Up shear bits are used for faster feed rates and deeper holes where chip evacuation is key (although multiple passes are still suggested for deep holes and mortising).

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