www.- : spiral upcut router bits

Woodworking Stack Exchange is a question and answer site for professional and amateur woodworkers. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Straight-cut router bits come with blades with three broad shapes: straight, down-spiral, and up-spiral. When should you use a spiral blade instead of spiral cut router bit of straight blade?

When lf you use an up-spiral instead of a down-spiral? The main advantage of using straight bits seems to be that they are cheaper, and easier to re-sharpen.

They are perfectly fine for a number of uses though, especially where finish isn't particularly important. This is because instead of the cutting edge hitting the timber all at once as with a straight-fluted cutterthere is only a single small point of contact between the cutter and the workpiece when edge-routing, and a more constant contact when slot-routing. Consequently you get less "chatter" of the router during use.

If you're using a CNC router then you can spiral cut router bit of typically use a faster feed speed when cutting with a spiral bit just because of the superior chip clearance and the lessened ccut. The chip clearance with an upcut bit also means that they're good for plunging into the centre of spiral cut router bit of workpiece if this is important to you.

Upcut bits give good chip clearance as they bring the spiral cut router bit of up and out of a slotted cut, but they may cause the top cut surface to chip away more than a straight bit spirxl a downcut bit. If spiral cut router bit of cutting a composite, laminated or veneered board spiral cut router bit of a situation where the top surface finish is important e.

When using a downcut bit for partial-depth slotting i. If you're edging a board which is laminated on both sides, and you don't want either side to chip, you can actually get what's called a "compression cut" or up-down spiral blade where the lower part of the cutter is an upcut, and the upper routter is a downcut, so chips are pushed towards the middle of the cutter.

This means that neither the top or bottom of a board will experience major chipping. There's an example of a compression bit here. For completeness, if you want to get really advanced then you can also get upcut, downcut and compression-cut bits with chip-breaking edges which look serrated and break the chips into very small chunks, which will give you super-fast cuts with little resistance. With these cutters you'll see some lines from the serrations, so they're typically only used for roughing or where surface finish isn't important.

These are also available in compression-cut bits! If you look here you can see some of these bits scroll to near the bottom and look at the "Tornado" cutter.

They're pretty advanced and not cheap, but if you're looking to do CNC routing of melamine-faced or ply boards at blistering speeds, then that's what you'll need. A bit outside the realms of what's used in the vut spiral cut router bit of The advantage of spiral router bits is that you do not "hammer" a blade into spiral cut router bit of grain and pull it out again all the time, tearing and pulling wood out.

Instead, the router bit cuts very continually without going "in and out" of the grain, much like a blade that you pull smoothly spiral cut router bit of the material.

You work with very little vibrations and get a spiral cut router bit of clean cut. Also you can "plunge" nicely. Lastly, the spiral transports the wood shavings away the "right" or "upcut" spiral, anywayfurther increasing precision, and also reducing friction and burn. Using a "upcut" spiral cut router bit of, you get more shavings in front of your vacuum's muzzle, and less in other places.

Using a "left" or "downcut" spiral, you can do a pulling cut, which is said to yield an extremely accurate upper edge but I haven't tried that one, I prefer the "upcut" spiral's ability to transport away the shavings.

Sign up to join this community. The best answers oof voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. When should I use a spiral router bit? Ask Question. Asked 5 years, 11 months ago. Active 5 years, 11 months ago.

Viewed 9k times. Straight-cut router bits come with blades with three broad shapes: straight, down-spiral, and up-spiral from left to right, straight blade, down-spiral blade, and up spiral blade, from amazon. Improve this question. FreeMan 3, 16 16 silver badges 33 33 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. WhatEvil WhatEvil 3, 10 10 silver badges 29 29 bronze badges. You should use spiral blade bits whenever you sliralspiral cut router bit of is: You do not need a diameter that is too large spiral router bits cannot have a diameter larger than the shaft, so you're limited to 12mm or so maximum.

No ball bearing needed for guidance, usually spiral cutters don't have these though, as pointed out by Rob, you can find them.

You don't mind spending a few coins more. Damon Damon 3, 17 17 silver badges 20 20 bronze badges. The common terms for the left and right spiral are rokter and upcut, which refers to the direction the shavings are pushed when spiral cut router bit of a handheld router as opposed to a table-mounted router.

Also, you can buy spiral bits with bearings. Ah OK, in Germany, these are "left" and "right" where "right" would be "upcut" pulling shavings out of the holethanks for the correction. I'm not aware of any spiral bits with bearings, and when asking psiral it, I was once told by a tool vendor that this isn't even possible.

Bif you can buy them with bearings, let me change that to "uncommon" then. Also you can buy spiral cutters where the cutter head is a larger diameter than the shaft: axminster.

I believe you can actually get reverse-rotation upcut and downcut bits, i. WhatEvil: Yes, I just saw such a thing if it's the same two days ago. It was basically a downcut edge with an upcut spiral going over it. Needless to say that this bit was about twice as expensive as the others and it most probably isn't very resilient to breakage since there's a lot less material inside.

Never used such a thing, so can't say whether it's any good In theory, it should have the advantages of both worlds. Sign up or log in Sign up using Google. Sign up spiral cut router bit of Facebook.

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