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Creaping Router Bit

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Forum topic by andy_P posted 1328 days ago 2346 views 0 times favorited 19 replies Add to Favorites Watch
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andy_P

218 posts in 1843 days


1328 days ago

I am using a Porter-Cable 890 router in a Rockler router table. I have run across this problem now and then and wondered if anyone else has experienced the problem.

Everything appears to be tight but yet I have ruined several pieces because the router bit travels up while making a pass and actually ends up breaking through the piece by the time you get to the end. I literally had to re-adjust the hight of the bit and almost over tighten the lever. The bit was stilll tight in the collet. I have found the only way to get around this is by tightening the locking lever to where it is almost too tight.

Any ideas or comments?

-- Wood is a gift from God/Nature that maintains its beauty forever via the hand of a woodworker.


19 replies so far

View DaddyZ's profile

DaddyZ

2382 posts in 1675 days


#1 posted 1328 days ago

I have a porter Cable Router that done this, Solution New Collet the 1 in the router was Broke.

-- Pat - Worker of Wood, Collector of Tools, Father of one

View papadan's profile

papadan

1140 posts in 2003 days


#2 posted 1328 days ago

Place a small rubber o-ring on the bit shank to prevent inserting too far into the router collet. Too far in puts the collet on the tapered section of shank connecting the head. If your sure this is not the problem then replace the collet.

-- Carpenter assembles with hands, Designer builds with brains, Artist creates with heart!

View CharlieM1958's profile

CharlieM1958

15691 posts in 2853 days


#3 posted 1328 days ago

Is the bit moving in the collet, or is the height adjustment changing?

Actually, I just had a similar problem with my table-mounted Triton router. I’ve had the router for a couple of years, and always just set the bit height and went to town. No problem. Recently, I started having problems with the bit dropping lower during a pass. At first I thought the bit was slipping down in the collet since I never bottom out the bit when installing it. After monkeying around a bit, I realized I never bothered to use the locking lever on the back of the router. Duh….

It’s funny, though, that it worked fine for quite some time without using the lock lever before I started to have a problem.

-- Charlie M. "Woodworking - patience = firewood"

View GMman's profile

GMman

3902 posts in 2332 days


#4 posted 1328 days ago

I would say the lock lever is not tight enough.
After damaging a few pieces I now make sure my lock ever is tight.

View andy_P's profile

andy_P

218 posts in 1843 days


#5 posted 1328 days ago

It is devinitely not the collet slipping. The hight adjustment is what is changing. I have a hunch from vibration, but you would think that it would be built to withstand that.

-- Wood is a gift from God/Nature that maintains its beauty forever via the hand of a woodworker.

View andy_P's profile

andy_P

218 posts in 1843 days


#6 posted 1328 days ago

I’ve tightened that lock lever so much that it is almost too hard to get closed alll the way. But, when I do that, it does seem to stop the problem.

-- Wood is a gift from God/Nature that maintains its beauty forever via the hand of a woodworker.

View richgreer's profile

richgreer

4522 posts in 1709 days


#7 posted 1328 days ago

I have the same router on the same table. I use it a lot and I have never had this problem. However, I am using a router lift (Woodpecker). Before buying the router lift I was bothered by how sloppy the lift mechanism in the base router was.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View CharlieM1958's profile

CharlieM1958

15691 posts in 2853 days


#8 posted 1328 days ago

You may have already done this, but I would try cleaning all the mating surfaces thoroughly, wiping with mineral spirits. It could be that very fine dust is acting as a lubricant to allow the slippage.

-- Charlie M. "Woodworking - patience = firewood"

View Steve Rathke's profile

Steve Rathke

26 posts in 2347 days


#9 posted 1327 days ago

I had this happen on my porter cable 3hp motor. i added the rubber o-rings and clean the collet and cup out with compressed air. Also found some grease like stuff on some bits when they are new. its easy to wie clean with naptha – get it at the home center. clean, dry and o-ring fixed my porter cable bit slipping issue.

View Chelios's profile

Chelios

567 posts in 1700 days


#10 posted 1327 days ago

If you overtighten the collet this can happen. You should buy a new one. They are cheap and it is worth it for your safety. Without seeing it, it is difficult to say for certain but even if this is not the issue with yours, don’t risk a bit travelling out of a router spinning at 30k rpm.

View DragonLady's profile

DragonLady

298 posts in 1641 days


#11 posted 1327 days ago

I would replace the collet, as suggested. It’s a fairly cheap replacement, and worth it for safety.

If you are still having issues, then I would perhaps wrap the router motor in a layer of non-slip tape (or wrap a strip of that rubber mat stuff) around it and see if that helps. After cleaning everything very well, of course.

-- A woman's work is never done-but power tools help!

View ND2ELK's profile

ND2ELK

13495 posts in 2408 days


#12 posted 1327 days ago

I would clean collet and bits as suggested and if this does not work, I would try a new collet.

-- Mc Bridge Cabinets, Iowa

View andy_P's profile

andy_P

218 posts in 1843 days


#13 posted 1327 days ago

I can assure all of you that the bit is not slipping in the collet. I clean out the collet whenever I change a bit. Also, I maintain about 1/8 inch between the top of the collet and the base of the bit. When this does happen the bit is still in the collet where I set it. What moves is the entire hight adjustment to the router. It’s like someone is turning the adjusting knob while the router is running.

I will, however, do as many of you suggest and clean the entire router and check out the collet. I’ve got some dead time in the shop so maybe I will run it and run it and try and reproduce the problem on my terms.

-- Wood is a gift from God/Nature that maintains its beauty forever via the hand of a woodworker.

View lanwater's profile

lanwater

3076 posts in 1569 days


#14 posted 1327 days ago

It hapenned to me twice with the same router.

The first time I thought I did not tighten enough.
The second time I tought the hit shank is not upto snuff.

I bought a new collet.

-- Abbas, Castro Valley, CA

View andy_P's profile

andy_P

218 posts in 1843 days


#15 posted 1327 days ago

lanwater:

Was the entire collet assembly creaping up or was the bit slipping within the collet?

-- Wood is a gift from God/Nature that maintains its beauty forever via the hand of a woodworker.

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