I'm desperate (router collet issues) - Router Forums
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post #1 of 23 (permalink) Old 09-17-2018, 04:17 PM Thread Starter
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Default I'm desperate (router collet issues)

Hey all,
I've got 17 orders that must be ready by this Friday and I am losing my mind over this. Really hoping you can help!

My collet isn't grabbing the bit.
I'm using a dewalt 618, tried various bits, bought a new collet, what am I doing wrong??
When I tighten the collet to the router there's no problem, it gets tight. But it doesn't tighten the bit. I must be forgetting to do something....

Any help is appreciated. Thank you!!!
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post #2 of 23 (permalink) Old 09-17-2018, 04:32 PM
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When you say you've got 17 orders that suggests that in fact this isn't your first dance. You've obviously installed and removed bits in the past, which sort of eliminates the most obvious reasons(?).
Could the nut have a damaged thread, or the arbor? Crossthreaded? It wouldn't take much to stop the nut from tightening properly. Have you tried different bits? Checked their shank size with a caliper?
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post #3 of 23 (permalink) Old 09-17-2018, 04:33 PM
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bit shank is undersized...
get a different brand of quality bit...

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 #4 of 23 (permalink) Old 09-17-2018, 04:38 PM Thread Starter
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This is not my first dance, but I certainly have my senior moments.
I tried a new collet and tried different bits.
I'm wondering if the threading where the collet threads onto the router is bad.
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post #5 of 23 (permalink) Old 09-17-2018, 05:33 PM
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you got any kind of lube on the bit shanks and in the collet..
bit set too deep???

.
Attached Files
File Type: pdf R3 How a Collet Works.pdf (183.7 KB, 34 views)
File Type: pdf Collet_Maintenance.pdf (86.2 KB, 32 views)

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 #6 of 23 (permalink) Old 09-17-2018, 06:15 PM
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The collet is supposed to have a portion that as you "screw" the collet down, the interior closes in on the shank. Look at the grooves cut through the collet in this picture. You can see that it is designed to close in on the shaft. If that part is missing or broken, it won't hold the bit.

If you've tried other collets and other bits and it doesn't hold, then you probably have some defect in the threads, either cross threaded or possibly the threads are damaged so the collet nut still rotatess, but only turns in a circle without going further down the threads. You can look at the threads with a magnifier to see if there is something about the thread that doesn't look right. Or take it to a tool service station and have them look it over.

Stick's suggestion about lubrication or too small a shaft. 12mm vs 1/2 inch can be enough to prevent holding tight. The collet itself really doesn't change size much, it is, after all, a pretty high quality of steel, and very carefully machined. But they do break or stop working right, for example, the Bosch Colt is known to "eat" collets. We're talking a few thousandths size changebetween loose and tight.

You didn't say whether the problem persisted with other collets and bits you know to have worked in the past. If no collets or bits tighten, I'd bet on damaged threads on the shaft.
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post #7 of 23 (permalink) Old 09-17-2018, 06:19 PM
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The threads aren't what holds the bit in. It's the force applied by squeezing the male cone of the collet into the female cone of the router shaft. If you are able to tighten it down it should squeeze the slots together in the male cone. The only situation I can think of where it wouldn't happen is if the female cone wore badly and the nut bottomed out on the end of the router shaft without tightening the cone together. That's fairly unlikely and maybe even impossible. I'm 99% sure without checking a reference that the 618 collet is the same as a 1617 Bosch collet which is the same as my Hitachi M12V2 and VC. I don't think it will bottom out without forcing the cone together.

If all else fails you could consider switching your collet out with a Musclechuck instead. The manufacturer's test say that it holds I think 4x what a regular collet will.

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post #8 of 23 (permalink) Old 09-17-2018, 06:45 PM
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What was the result when you tested other collets and bits? Did any combination work? Did NO combination work?

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post #9 of 23 (permalink) Old 09-18-2018, 05:28 AM
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On the 618 collets, you unscrew the nut but the bit won't come out. The nut comes to another hard spot and you loosen that, then the bit will come out.

I have a 618 and that is how mine works.
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Don in Murfreesboro,Tn.

Measure once cut twice and it's still to short.

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post #10 of 23 (permalink) Old 09-18-2018, 05:39 AM
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Quote:
Originally Posted by hawkeye10 View Post
On the 618 collets, you unscrew the nut but the bit won't come out. The nut comes to another hard spot and you loosen that, then the bit will come out.

I have a 618 and that is how mine works.
does it work the same when you are tightening the collet...
could it be that you only think it's tight but it needs more tightening to do it's thing...
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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”
Stick486 is online now  
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