I know the dictionary difference between a spiral up cut vs spiral down cut bit, but am having trouble fully grasping what to use when. I am Up Spiral Bit Vs Down Spiral Bit Review in the Up Down Spiral Router Bits Kit process of beefing up my router bit collection and would like to understand the practical uses of each. As a side note, I have a lot of routers and use them A LOT. I am a huge fan of the router, and it, with a few clever jigs/sleds, replaces a lot of tools in my shop.  So if I understand correctly, down cut bits are for cutting completely though the piece (cutting circles for example) and up cuts are for mortise/dado cuts and anything else that doesn't go through? That is helpful. Also I do cut a lot of mortises/dados with a horizontal jig I made, but I use a fluted straight bit. Would a spiral up cut give me a cleaner cut/flatter bottom? Quote. Link to post. Our production quality solid carbide spiral bits combine effective chip removal with a continuous shearing action cut not obtained from a standard straight bit. You’ll get smoother cutting action with better results. Up-cut Bits provide faster cutting while they pull chips up and out of the work or towards the router. They are excellent bits to use when Spiral Bits Upcut Downcut cutting material in a router table since they tend to hold the work piece to the table itself. Ideal for mortise and tenons, grooving, slotting or routing deep blind holes. Down-cut Bits cut slower and push chips away from the router to elimina. WHY SPIRAL BITS ARE BETTER FOR PLUNGE CUTS. Because a spiral bit is designed much like a drill bit, it makes plunge cuts easily. The cutters of a straight bit do not overlap, so if you plunge straight down deeper than 3/32 in., you might burn away the wood in the middle, but you won’t cut it. The increasingly popular spiral router bits borrow technology from the metalworking industry. Spiral bits look like drill bits and are most often made of solid carbide, so they are super sharp and leave a superior cut on wood. Two flutes ground around the body of a spiral bit smooth vibration by spreading.
Jun 05,  · Ethan talks about the differences between up spiral, down spiral, single flute and two flute router bits. He goes when, where and what to expect using these. Apr 08,  · down vs. up spiral bit. In what situation would you ever use a down spiral router bit? An up cut or up spiral bit cleans the shavings but a down cut or down spiral bit seems counterproductive. Sep 10,  · If you need 2 perfect faces, a compression bit combines a short (5/16 to Up Down Spiral Router Bits Zip 3/8 long) up spiral tip with a down spiral bit, so all cutting forces are directed to the centre of the work so both faces are supported for absolute minimum tearout. As previous suggested, to cut a slot, take it in a number of steps, and clear te recess of waste if it is.

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