Having router bits creeping

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Forum topic by Kenny posted 200 days ago 551 views 0 times favorited 12 replies Add to Favorites Watch
View Kenny's profile


7 posts in 1137 days

200 days ago

Topic tags/keywords: question router

I am having router bit creeping out and ruining my work before I catch it.

I am contemplating installing a small groove in my bits and installing a split ring
above the collet to prevent this in the future.

Without a doubt this was caused by trying to cut too much too fast
causing the shank of the bit to spin.

The router is on a ,gunstock duplicator, so a little gouge ruins the blank.

Any suggestions. Kenny

-- Kenny, Ohio

12 replies so far

View Loren's profile (online now)


7464 posts in 2284 days

#1 posted 200 days ago

How tight are you making the collet?

(my rule is “a fair grunt” tight)

Cleaning collets regularly can help them perform well.

Sometimes with use a collet can wear out. I imagine
this would be mostly an issue if you acquire the equipment


View jumbojack's profile


1176 posts in 1261 days

#2 posted 200 days ago

As Loren said CLEAN the collet. Seat the bit in the collet and back it out an 1/8 or so.

-- Made in America, with American made tools....Shopsmith

View Bill White's profile

Bill White

3426 posts in 2597 days

#3 posted 200 days ago

I don’t think that I would be cutting a groove in a bit shank. Too much chance for a fracture, and I don’t wanna be anywhere near a fractured router bit.


View SPalm's profile


4798 posts in 2519 days

#4 posted 200 days ago

Clean the shank of the bit too. Burn marks are slippery.

I have worn out a collet before and had to buy a new.

Don’t groove the shank.

Have you tried a different brand? Like a real quality brand name?


-- -- I'm no rocket surgeon

View basswood's profile


255 posts in 257 days

#5 posted 200 days ago

The shanks taper slightly near the business end, this causes bits chucked in too far to not be held firmly enough. This is why the posts above suggest backing the bit back out an 1/8” or so.

You can lightly sand the shanks (lightly abrading them) to help a collet hold on better. Too much of that and the collet may not want to let go though and when it does you may have to hike across the shop to retrieve it. So try all the other measures first.


View 7Footer's profile


1012 posts in 585 days

#6 posted 200 days ago

I had the same thing happening to me a few weeks ago while cutting some dados, the bit was creeping out over 1/4 inch when I got a couple feet into the cut. I finally realized what was happening and there were 2 things going on, one was like you said I was cutting too much stock at once, but the other was that my bit was not chucked deep enough into the collet. So once I set it as deep in the collet as I could I didn’t have any more problems, maybe there is a happy medium between getting it chucked far enough in like ^basswood said and not having it chucked far enough. Good luck!

-- If a kid asks where rain comes from, I think a cute thing to tell him is "God is crying." And if he asks why God is crying, another cute thing to tell him is "Probably because of something you did." -

View pintodeluxe's profile


3337 posts in 1450 days

#7 posted 200 days ago

Once in a while a bit will be out of spec on the diameter, and won’t clamp well.
If a collet has ever had an 8mm bit chucked in it, it will ruin the collet.
If the shank of the bit, or the inside wall of the collet have been scored they should be replaced.

Good luck with it.

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

View upinflames's profile


84 posts in 799 days

#8 posted 200 days ago

The reason you back the shank out of the router 1/8” is the collet, when tightened, it squeezes and pushes down on the shank. If the bit is bottomed out it will seem tight and will creep out.

View Kenny's profile


7 posts in 1137 days

#9 posted 200 days ago

Thanks for the help fellows.
Bill, the collet goes on the shank first and then the grooves with the snap ring
on the tail end up inside the router.
I fail to see how this could break or fracture as nothing would be touching
that end.
I cut the grooves so the collets have 1/8” end play on the shank.
I will do a good job of cleaning the collets and router bit shanks as
has been suggested.

-- Kenny, Ohio

View bigblockyeti's profile


1497 posts in 357 days

#10 posted 200 days ago

What make and model router are you experiencing this problem with?

View CharlesA's profile


1268 posts in 434 days

#11 posted 200 days ago

Cutting grooves on bits seems like a radical solution to a problem that should be easily solved.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

View MalcolmLaurel's profile


210 posts in 260 days

#12 posted 200 days ago

I’ve had the same problem with an older Craftsman router that was my father’s. Part of the problem in my case is that the shaft lock is worn so it’s hard to tighten it securely.

-- Malcolm Laurel -

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