How to stop a ¼" bit from moving up in its collet? - Router Forums
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post #1 of 32 (permalink) Old 04-11-2020, 03:13 PM Thread Starter
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Default How to stop a ¼" bit from moving up in its collet?

Dear all,
I have the older model Triton ½" router in a Triton table. All is good with ½" bits, but I have an upcut ¼" bit that I use in a collet. Regardless of what I do the bit moves upwards in the collet, i.e. starts to cut deeper as soon as I start moving wood through it (collet does not move.). It can move up 3/8" already after 6" of cutting, and it's driving me nuts. I've tightened the chuck hard as I can, used mallets to tighten it, used higher and lower speeds, used different brands of collets, but nothing helps. Haven't tried locktight yet, but will. Anyone had a similar problem, or have any tips?
Thanks so much,
Dave
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post #2 of 32 (permalink) Old 04-11-2020, 03:37 PM
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Sounds like a defective collet - I’d try to get Triton to make good on their reputation and provide you a new one - unless you’ve had this one a good while and it may just be worn out. The last thing you want is any kind of failure that results in a loose tool flying at you! I would desist from using this item until you get to the bottom (pun not intended) of the issue. I feel your frustration, especially with a premium brand...
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post #3 of 32 (permalink) Old 04-11-2020, 03:40 PM
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Is it a true 1/4" shank - 0.25"? What about the collet? Is it possible one is Metric? Measure them and see.

David

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post #4 of 32 (permalink) Old 04-11-2020, 03:42 PM
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Sound more like the bit is undersized. Silly question, but here goes; have you measured the bit shank with a caliper?
" ..used different brands of collets, but nothing helps..."
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post #5 of 32 (permalink) Old 04-11-2020, 03:47 PM
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Also, as mentioned recently in another post, if there are any burrs or defects on the bit or collet, you may be done with this one. Can’t be anything to interfere with it purpose or you are just taking chances. This also assumes the collet is clean and compressing fully with no sawdust in the cavities, etc. Just being anally imaginative...

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post #6 of 32 (permalink) Old 04-11-2020, 03:52 PM
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whose bit is it???.. (other than yours)...
try a different bit...
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post #7 of 32 (permalink) Old 04-11-2020, 06:48 PM
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Collets are precision devices, they only tighten a few thousandths from loose to tight. As they age, they can deform slightly, enough to allow for creeping. Generally they just need to be replaced. The older Bosch Colt is said to go through collets so I keep an extra on hand.
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post #8 of 32 (permalink) Old 04-11-2020, 06:52 PM
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Thanks for the heads up, Tom; I did not know that.
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post #9 of 32 (permalink) Old 04-11-2020, 09:19 PM
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Hi Dave and welcome. I have some 6mm bits and they literally fall into a 1/4" collet so you should be able to tell if it's the wrong size. When you say different collets do you mean reducer bushings? As suggested check the shank size to see how accurate it is. I got a bit once that I couldn't get into a 1/4" collet as it was a few thousandths too big so it's also possible to get one that is a few thou too small which could explain your problem. Don't over tighten the collet nut, that won't likely help and it could do damage. I also wouldn't use loctite. Find the source of the problem instead.

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post #10 of 32 (permalink) Old 04-11-2020, 09:28 PM
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You might even consider getting a 1/2" shank 1/4" bit if the 1/2" bits work OK.
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