Router bit slipping in collet - Router Forums
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post #1 of 15 (permalink) Old 06-21-2018, 05:15 AM Thread Starter
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Default Router bit slipping in collet

I have one router bit that slips in its collet and I'm wondering how to diagnose the cause. In this case, "slipping" means "rising" during the cut during a router table operation.

This happens to be a Whiteside 1/4" cutting diameter with a 1/4" shank mounted to a Bosch 1617EVS (12 amp, 2 1/4 hp) in a router table configuration. Normally, I'm very happy with Whiteside bits and I'm not automatically assuming this is a "bad" bit.

I don't have this problem with any other 1/4" or 1/2" shank bits from any other mfgs or any other Whiteside bits.

Before calling Whiteside, I wanted to learn what might cause this problem. I've cleaned the collet and where it fits into my router and made sure the bit is installed properly in the collet but this hasn't fixed the problem.

Thanks much for any help.
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post #2 of 15 (permalink) Old 06-21-2018, 06:02 AM
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welcome N/A to the forums...
call Whiteside....
mean while is is some reading on collets...

.
Attached Files
File Type: pdf Guide to Router Collets.pdf (163.0 KB, 72 views)
File Type: pdf How a Collet Works.pdf (183.7 KB, 61 views)
File Type: pdf Collet_Maintenance.pdf (86.2 KB, 62 views)
File Type: pdf Care and Sharpening of Router Bits.pdf (2.21 MB, 81 views)
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post #3 of 15 (permalink) Old 06-21-2018, 06:18 AM
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@LuckyDais - Welcome to the forum - when you get a moment, please update your profile with a first name and location - it makes for a more friendly forum.

Your issue: since you have no problems with any other bit then it MUST BE the bit. As stick suggested, call Whiteside first. Perhaps the bit you have issues with has a burr that is preventing it from holding fast, or perhaps the bit is a bit undersized??? Have you check the diameter of the bit shaft? If you have another router, does that bit exhibit the same issue in another router? When you install that bit, is it bottoming out in the shaft or are you raising it slightly off the bottom? If it is bottomed out, the bit raising might be caused by vibration.
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post #4 of 15 (permalink) Old 06-21-2018, 07:34 AM
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As Vince pointed out make sure you are not bottoming out the bit when you install it in the collet. Put it in all the way then back it out about 1/8", then tighten the collet. Definitely call Whiteside if you find the bit shaft undersized, they may have had a problem with a batch of bits and they need to know. They will probably replace the bit to make sure you have a safe bit if that is the case. I have always had good experiences with the Whiteside customer service department.
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post #5 of 15 (permalink) Old 06-21-2018, 08:45 AM
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I have had this happen with a Metric sized bit in a imperial sized collet. Check the Diam. of bit with mic/caliper.
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post #6 of 15 (permalink) Old 06-21-2018, 10:57 AM
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I got a cheap bit once that was too large to go in the collet. It is possible as suggested that it may have been machined under size although Whiteside's QC is among the best. As Herb suggested it could be a 6mm instead of a 1/4". I bought a Bosch bit that turned out to be 6mm. The late Pat Warner once said on here what he felt the maximum deviation from correct size could be and I know it was at the most 2 thou and may have been a little less. If you don't have a way to measure then I recommend getting a caliper. You can get digital ones for as little as $12 on sale these days and there's lots of other stuff you can do with them. Mine is one of the most used tools in my shop.
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post #7 of 15 (permalink) Old 06-21-2018, 01:21 PM
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what herb said.

1/4" = 6.35 mm
6 mm bit = 0.236.
1/4" in thou = 0.250.
You have a 6 mm bit in a 1/4" collet.
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post #8 of 15 (permalink) Old 06-21-2018, 06:46 PM
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I have a 6mm solid carbide 4 flute bit that I use in my Bosch router, it has 6mm and 1/4" collets, there is no way the 1/4" collet could even get tight enough to stop the bit from falling out on its own.

As Herb said check the diameter with a micrometer or vernier caliper, it may be undersized.

Quote:
Originally Posted by Cherryville Chuck View Post
If you don't have a way to measure then I recommend getting a caliper. You can get digital ones for as little as $12 on sale these days and there's lots of other stuff you can do with them. Mine is one of the most used tools in my shop.
I recently bought an Igaging Absolute Origin digital vernier caliper, that has changed my DIY life, no more trying to measure with a steel ruler, and the depth gauge on the end lets me set the height of my router to within 0.01mm now. So as Chuck said you will use one a lot more than you think.
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post #9 of 15 (permalink) Old 06-22-2018, 09:35 AM
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Quote:
Originally Posted by LuckyDais View Post
I have one router bit that slips in its collet and I'm wondering how to diagnose the cause. In this case, "slipping" means "rising" during the cut during a router table operation.

This happens to be a Whiteside 1/4" cutting diameter with a 1/4" shank mounted to a Bosch 1617EVS (12 amp, 2 1/4 hp) in a router table configuration. Normally, I'm very happy with Whiteside bits and I'm not automatically assuming this is a "bad" bit.

I don't have this problem with any other 1/4" or 1/2" shank bits from any other mfgs or any other Whiteside bits.

Before calling Whiteside, I wanted to learn what might cause this problem. I've cleaned the collet and where it fits into my router and made sure the bit is installed properly in the collet but this hasn't fixed the problem.

Thanks much for any help.
May be the bit shank undersize issue but also please check whether a snap ring has come off your 1617 or not.
REFER to Post #7 & #8 of
https://www.routerforums.com/bosch/7...ch-1617-a.html

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Last edited by reuelt; 06-22-2018 at 09:37 AM.
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post #10 of 15 (permalink) Old 06-25-2018, 05:22 AM Thread Starter
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Thank you to everyone who took the time to reply. It is generous of you to share your experience.

I'm inserting the bit properly (not bottoming) but I didn't think to check the diameter of the bit. I'll check it with my calipers.

reuelt ... I'll also ck my snap ring but I suspect all of my bits would have issues if the snap ring had come off. Thanks for the link.

I'll call Whiteside and post here if I learn anything worth sharing.

Thanks again.
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