Hot collet and router bit - Router Forums
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post #1 of 16 (permalink) Old 07-02-2020, 01:18 PM Thread Starter
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Default Hot collet and router bit

I have just replaced a Bosch Colt with a new larger 1.25 hp Bosch GKF125CE on my CNC machine. After an approximate 10 minute run with the new router, the collet and bit were very hot. Too hot to touch for about 2 minutes. I never had this issue with the Colt. Is this a sign of future problems to come, does the router need some run time to "loosen up" or should I stop using it??
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post #2 of 16 (permalink) Old 07-02-2020, 02:02 PM
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Welcome to the forum! Add your first name to your profile to clear the N/a in the side panel and so we'll know what to call you.

We do like photos so show us your shop, tools, projects, etc. whenever you're ready. What sort of woodworking are you planning or doing with your CNC?

First question would be what are your feeds/speeds/depth of cut? Heat is a good indicator you're going too slow. Our CNC has a 3kW water cooled spindle and I cut fairly aggressively. After 10 minutes of what I would call heavy cutting the chips are very warm and so is the work piece near the cut, but the bit and collet can easily be touched as soon as the cut is over and the bit stops spinning.

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post #3 of 16 (permalink) Old 07-02-2020, 02:23 PM Thread Starter
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Hi David, thanks for the reply. I'll be very honest with you. I've been making these same items for 5 years and have always went with the data computed at setup. I've never changed any settings other than pass depths and stepovers. Never had a problem. That is what stopped me today, when I went to change to a different bit and felt the extreme heat.
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post #4 of 16 (permalink) Old 07-02-2020, 03:05 PM
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Got any photos of your setup, Tom? What are your feeds/speeds and in what material are you cutting?

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post #5 of 16 (permalink) Old 07-02-2020, 03:35 PM
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The only things I can think of that would cause the problem are some slippage between the bit and collet (any signs of that on the bit shank?), a dull bit, too slow a feed like David said, or a bad bearing on the router (but you should be able to hear that). If it's the bottom bearing then running it for several minutes without doing any routing should still cause it to get hot.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #6 of 16 (permalink) Old 07-03-2020, 07:22 AM
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I was going to suggest checking/changing the bit but Charles has that covered. If you're concerned it might be the router, which I doubt but could be checked, the motor would likely be heating up and that could be checked by checking the amp draw while running under a load. Best guess is the bit but it's a guess.
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post #7 of 16 (permalink) Old 07-03-2020, 01:35 PM
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Welcome to the forum
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post #8 of 16 (permalink) Old 07-03-2020, 04:44 PM
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Welcome to the forum. Does the motor get hot too, or just the bit?
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post #9 of 16 (permalink) Old 07-03-2020, 06:27 PM
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you running the bit in reverse...

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!!!
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post #10 of 16 (permalink) Old 07-03-2020, 06:58 PM
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Quote:
Originally Posted by Stick486 View Post
you running the bit in reverse...
How do you do that? I wanna try that! Do you plug it in upside down?
HErb
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