Router bit slip

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Forum topic by unclearthur posted 02-25-2019 04:53 AM 441 views 1 time favorited 4 replies Add to Favorites Watch
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383 posts in 2837 days

02-25-2019 04:53 AM

I was doing some simple stopped dados (or long mortise?) on a router table using a 1/4” upcut spiral bit. Depth of cut was about 3/16”. Half way thru a cut to my surprise the router bit poked up thru the work-piece – the bit had slipped upwards in the collet during the cut by about 1/2”.


I’ve never had a router bit slip before …. which makes me a little concerned. The bit was clean & sharp;you can’t really see inside the collet.

So I was wondering what do people do if anything to maintain / clean their collets? Any red flags to look out for to indicate a problem?

4 replies so far

View wuddoc's profile


359 posts in 4767 days

#1 posted 02-25-2019 05:06 AM

View johnstoneb's profile


3167 posts in 3222 days

#2 posted 02-25-2019 02:16 PM

Have had that happen before. Blow out the collet with compressed air and use lacquer thinner to clean both sides of collet, nut and also clean the shaft of the bit. I blow out the collet after every use and then clean with lacquer thinner periodically and haven’t had a problem since.

-- Bruce, Boise, ID

View Firewood's profile


1456 posts in 2683 days

#3 posted 02-25-2019 02:47 PM

What Bruce said, but also make sure the bit is inserted to the minimum depth specified BUT don’t let it bottom out in the collet either. Tightening the collet nut pulls downward on the bit. If it’s already hitting bottom, the collet can’t properly tighten up on the bit shaft.

-- Mike - Waukesha, WI

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383 posts in 2837 days

#4 posted 02-25-2019 04:34 PM

Got it, thanks.

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