router bit climbing out of the collet - Router Forums
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post #1 of 26 (permalink) Old 02-16-2018, 01:56 AM Thread Starter
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Unhappy router bit climbing out of the collet

Hi all, new to this place, I felt inspired to join up because I've recently acquired a nice Bosch GOF 1600 CE router and bought the fixed base
for this router from Amazon.

The fixed base I installed into my homebrew router table.

Currently I am building a new kitchen and I'm using Blum hardware that requires me to rout a 38mmx8mm rebate (rabbet I think in American?)
into the drawer bottoms.

Put an 18mm router bit with a 1/2" shaft into the fixed router base that's sitting in the table. Started making some cuts, around 16mm wide by
8mm deep. It worked fine for a while, when, suddenly, the router bit emerged from the top surface of the work!
Imagine my surprise. Just glad I didn't have my hand anywhere near.

This is not the first time it's behaved like that. The first time it happened I assumed I might not have tightened the collet sufficiently. I also
cleaned collet and router bit shaft with acetone, in case of oil or other lubricants. That time I was able to finish the job.

But twice? That is no longer an accident. I checked, the collet was really tightly torqued up.
I'd made about 8 or 9 cuts without a problem, when suddenly the bit started climbing, and it climbed 8mm (3/8") over a stretch of 200mm (8").
That's rapid!

It still was as tight as I can get it when I dropped the motor out of the table and checked the collet. But, having said that, I was able to gently
tap the bit back into the motor with a piece of 4x3 that I had lying on the workbench.

I simply don't know what's going on with this. Is it the collet? Is it my technique of using nearly the full width of the router bit (I was cutting with
the end-face of the router, and not with the side, running the sheet of mdf over the table)?

(please don't ask if I was using a 10mm router bit in a 1/2" collet -- I am not THAT clueless ).
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post #2 of 26 (permalink) Old 02-16-2018, 04:01 AM
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a little reading on collets..

..
Attached Files
File Type: pdf Collet_Maintenance.pdf (86.2 KB, 45 views)
File Type: pdf R3 STUCK ROUTER BITS.pdf (117.1 KB, 45 views)
File Type: pdf R3 How a Collet Works.pdf (183.7 KB, 41 views)
File Type: pdf R3 Guide to Router Collets.pdf (163.0 KB, 37 views)
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This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #3 of 26 (permalink) Old 02-16-2018, 05:08 AM Thread Starter
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Thank you for the links. Unfortunately, nothing in there that would be new to me - and I do keep things clean, and I know not to insert the bit all the way to the cutter head.
Don't forget that the router is very new; it's maybe clocked up 1-2 hours of running time all-up. Wear and tear and buildup of crud is unlikely to be the culprit.

One of those files mentioned resin leaving discoloration ... and I had some discoloration ... but, realistically, no resin or dust should be able to get between the collet and the bit
during operation (without a bit change). Some dust may have got into the slots and then smeared across the shaft when the bit started to slip. Which is the thing that should NOT
have happened.

Heat - is it possible that the spindle could expand from the heat of frequent cutting? The nut should hold things together one would assume.

-Peter
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post #4 of 26 (permalink) Old 02-16-2018, 05:31 AM
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imported aka chinese less than stellar bit w/ an out of spec shank..
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This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”

Last edited by Stick486; 02-16-2018 at 06:02 AM.
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post #5 of 26 (permalink) Old 02-16-2018, 05:55 AM
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I Peter and welcome. I have a Chinese bit that I can hardly get in my collect and I can hardly get it out. So like Stick said that might be a problem. You could also take the router back or call the manufacturer.
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Don in Murfreesboro,Tn.

Measure once cut twice and it's still to short.
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post #6 of 26 (permalink) Old 02-16-2018, 06:28 AM
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Welcome to the forum, Peter! I have never had that happen so not much help from me on this one. I do hope you get it resolved - could be dangerous! You can post photos if they're on your computer, btw.

David

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post #7 of 26 (permalink) Old 02-16-2018, 07:14 AM
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I too, suspect it's the bit. Try other bits and see if they slip too.
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“We should be careful to get out of an experience only the wisdom that is in it and stop there lest we be like the cat that sits down on a hot stove lid. She will never sit down on a hot stove lid again and that is well but also she will never sit down on a cold one anymore.” - Mark Twain
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post #8 of 26 (permalink) Old 02-16-2018, 08:03 AM
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Can you put a caliper on that bit and measure the shank...?

Nick

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LEARNING - the decision you make to know and
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post #9 of 26 (permalink) Old 02-16-2018, 08:21 AM Thread Starter
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Thanks, going to put the calipers on the shank tomorrow. Maybe that will give me a clue.
Doesn't really explain why it would work just fine for a while and then suddenly start shifting out.

But yes - the collet was very tight after the incident, yet I could tap the bit back into the collet with a piece of softwood,
so it was NOT firmly held in the vertical.
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post #10 of 26 (permalink) Old 02-16-2018, 08:24 AM
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Could it be possible that you might have had some "new-bit-goop" on it when you started...? Or some goop in the collet from a previously used new bit...?

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Points to Ponder...

LEARNING - the decision you make to know and
understand more about some thing.

TIME - the thing that gets in the way of learning.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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