Router Bit Question

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Forum topic by edwood1975 posted 11-30-2014 09:12 PM 812 views 0 times favorited 10 replies Add to Favorites Watch
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482 posts in 766 days

11-30-2014 09:12 PM

I have a router table and sometimes when I’m cutting a dado in some stock the bit keeps raising out of the router collet and deeper into the wood.

I’ve tried the obvious fixes for this for example take more passes to cut the depth but I don’t think 1/4” is too deep…

Please help!!!!!!

-- Ed

10 replies so far

View johnstoneb's profile


2105 posts in 1596 days

#1 posted 11-30-2014 09:17 PM

You are not getting the collet tight enough to hold the bit the collet may be dirty also.. Clean the collet, all surfaces inside and out and on the router and make sure the shaft on the bit is clean and dry also. I actually had a bit come all the way thru the material once. Now I make sure the bit is clean and dry and there is nothing in the collet. I haven’t had any problems since I started doing that.

-- Bruce, Boise, ID

View RogerInColorado's profile


321 posts in 1377 days

#2 posted 12-01-2014 12:37 AM

If I’m after precision, I won’t take more than 1/8 inch at a time. If you are using a 1/4 inch shank bit, then cutting a quarter of an inch of material at a time is way too much unless you love chatter marks. As to your description, I would concur that a slipping bit is the result of a dirty or loose collet, but usually the bit gets pushed farther into the collet, not further out.

View Holbs's profile


1347 posts in 1452 days

#3 posted 12-01-2014 02:18 AM

wait a second…
are you guys saying a router bit CAN rise or lower from the router collet?

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

View ElChe's profile


630 posts in 759 days

#4 posted 12-01-2014 02:27 AM

Yes. If the collet isn’t tight you can literally have a carbide or HSS Frisbee if the router bit falls out. Ed make sire the collet is clean and tight. No need to overtighten it. But it needs to be snug. 1/4” pass with 1/2” shank bit seems reasonable. With a 1/4” shank may be too much. Also make sure the router table isn’t flexing/sagging. Good luck.

-- Tom - Measure twice cut once. Then measure again. Curse. Fudge.

View AlaskaGuy's profile


2398 posts in 1732 days

#5 posted 12-01-2014 02:46 AM

What brand of router bit are you using. I have read where lesser brands sometime have slightly smaller shaft diameters do to poor quality control.

-- Alaskan's for Global warming!

View Holbs's profile


1347 posts in 1452 days

#6 posted 12-01-2014 04:06 AM

Didnt know a router bit can slide up or down while in the collet. I always blow away dust and inspect the collet and router bit shaft after every use. Hmm… maybe I should drop the collets into a cleaning solution every so often.
Good to know this. I like being safe :)

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

View Paul's profile


719 posts in 988 days

#7 posted 12-01-2014 04:33 AM

No, a router bit can not rise if correctly seated in your collet. If you blow your collet with compressed air and correctly seat it, it can not rise on its own. If you have a magic router bit rising from your collet your doing something wrong.


View pintodeluxe's profile


4827 posts in 2236 days

#8 posted 12-01-2014 04:41 AM

I have had that happen once or twice over the years. Usually using a 1/2” collet will fix the problem. Occasionally you have to clean sawdust out of the collet. If all else fails, try replacing the collet and bit.
I find using 2 wrenches to tighten the collet is more effective than using collet locking buttons.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View greg48's profile


588 posts in 2180 days

#9 posted 12-01-2014 04:11 PM

It seem’s that you already have good advice and I can add nothing here regarding your problem of loose bits in the collet. However, here’s a little tip I’ve read somewhere and I follow the advice regularly. Do not seat the bit shank in the bottom of the collet before tightening. Instead lift the bit slightly off the collet floor, then tighten. As I said this may not solve your tightening woes, but it will eliminate the problem of jammed bits that won’t come out.
Happy routing and be sure to wear hearing protection.

-- Greg, No. Cal. - "Gaudete in Domino Semper"

View jeffswildwood's profile


1287 posts in 1400 days

#10 posted 12-01-2014 05:46 PM

I had this happen once. 1/4 inch spiral up cut bit. actually dug in real bad. After I checked I had forgotten to even tighten the collet. One of those woops moments!

-- We all make mistakes, the trick is to fix it in a way thats says "I meant to do that".

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