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An up cut or up spiral bit cleans the shavings but a down cut or down spiral bit seems counterproductive. Reply. X. Replies. WayneL5 | Mar 26, pm | #1. You'd use a down spiral in any situation in which lifting up would tend to tear at the surface. Some examples include wood that splinters easily, veneer, and laminate. Usually such bits are used along an edge so chips wouldn't collect. charlesm | Mar 29, pm | #2. You use a down spiral when surface finish is important and chip clearance isn't an issue (such as for shallow cuts or when inverted in a table). The up. Spiral bits plow through material the way business jets slice through the sky; but neither of these high-tech tools fit everyone's budget. Like a coach-class airline ticket, a standard straight bit gets you where you need to be, and for a lot less money. So why pay for the upgrade?  Up- and down-cut flutes meet in the middle of the bit (below) to compress veneer on both faces of a panel tightly against the substrate. These big three have been joined by such specialty spirals as bearing-guided up-cut and down-cut flush-trim bits for template work and combination bits with short up-cuts and longer down-cuts for chip-free mortises. On a combination bit, the down-cut and up-cut flutes both press veneers against the particleboard substrate. When to turn to spirals. 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 in the 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. Upcut spiral tools are the most popular type of spiral fluted tool. The bearings are made for a variety of cutter diameters and lengths. The downward slicing action of a down cut bit leaves a very clean, crisp edge around the hole or groove it cuts. The decision is whether speed with a possibly ratty edge is okay. Dowelling Equip. Trip Posted September 13,

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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 between the material and sacrificial bed is crucial. These tools are predominantly used when a high quality cut finish is required on the top surface of cut parts.

Downward spiral tools often require reduced cutting speeds because the chips are pushed back into the material. The chip extraction is generally less effective with this type of tool than it is with an upcut spiral tool. You can purchase general purpose downcut bits or dedicated tooling for wood, plastics, aluminum, and other non-ferrous metals.

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