Bosch 1617 collet will not tighten bit - Page 3 - Router Forums

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post #21 of 30 (permalink) Old 08-07-2014, 02:31 PM
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I have the same router. I just got it. It works fine. All I have tried are 1/2 in bits.
Sorry, wish I could help.
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post #22 of 30 (permalink) Old 08-07-2014, 04:01 PM Thread Starter
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I can't tell really how the 1/2" collet behaves, because I've only tried it with a drill bit with a (presumably) 1/2" shank, and it was the same. However, I've been routing this afternoon with the 1/4" and it seems to operate fine. I've removed and re-installed the bit and it takes some effort to tighten it, but it seems acceptable now that I understand the limits. I did inspect the threads and the shaft and all seems perfectly fine; it does thread very smoothly, it's just that it does require some effort to perform the final tightening on the bit. However, that aside, all seems OK...
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post #23 of 30 (permalink) Old 08-07-2014, 04:08 PM
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hyper-clean the collet....
no WD-40 either...

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 #24 of 30 (permalink) Old 08-07-2014, 07:02 PM Thread Starter
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Hey Stick - that's an interesting point. The collet was straight out of the plastic bag, and both I and the Bosch repair expert examined the collet closely. What makes it interesting is that, out of the bag, the collet did appear to have a very light trace of machine oil all over it.

Anyways, I'm well into rounding over the cedar deck boards for my back door step and things appear to be groovy as Greg Brady. So thanks very much for all your suggestions and time - it's much appreciated!
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post #25 of 30 (permalink) Old 01-03-2017, 09:38 PM
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I see that this thread is inactive for quite a while but I am anxious ti see if a solution was found for collets not tightening. I have had my Bosch 1617 for a few years but I have recently run into the problem of the collet not tightening around the bit. When I tried to tighten the collet the bit stayed loose even after I really tightened the nut a hard as I could. The result was that when I removed the nut the collet stayed in the shaft. I used pliers to remove the collet and in the process crushed it. I bought a new collet and nut but it won't tighten either - although I have discovered how to remove the collet without destroying it. I have the same problem with the 1/2" and the 1/4" collets.
I thought that sawdust at the base of the shaft hole might be the problem but cleaning that debris out made no difference.
Recently I noticed that the bid thin nut at the base of the shaft where it enters the motor housing was loose. I tightened it with no apparent effect but I wonder now if there might be some sort of relationship between that and the problem I now have - although that seems unlikely.
If someone has a solution or a suggestion I would be eternally grateful.
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post #26 of 30 (permalink) Old 01-03-2017, 09:57 PM
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Hi Graham and welcome. I've never heard of a new collet and nut not working. Does it not hold at all or loosen soon after starting to rout? If the later is the case then you may be bottoming the shank of the bit in the recess. If that's not it then the only thing I can think of is that the forcing cone in the armature is worn. If nothing works there is still one solution and that is to replace the collet and nut with a Musclechuck. Some members repalced theirs with one even though theirs was still okay because the Musclechuck is a superior system.
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post #27 of 30 (permalink) Old 01-05-2017, 12:09 AM
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Hi Graham, I see that you have been a member since 2012. Great to see that you still participate and are not afraid to ask a question if needed...

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post #28 of 30 (permalink) Old 01-09-2017, 02:31 PM
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Thanks for the responses.
It made no sense to me that the collet would not tighten - especially one that was brand new so I went back and checked everything again and found the problem. I had been trying to center the base and was using the centering guide made from Rigid. It has one end that is 1/4" and the other is supposed to be 1/2". In fact, when I checked it with my calipers I found that it is quite significantly less than 1/2" and as a result, the collet never tightens. The nut bottoms out and when you remove the nut the collet stays in the shaft. One needs to be very careful when removing the collet or it will be destroyed. The best way I found was to put the end of a flat screwdriver between the end of the shaft and the collet head and give it a gentle twist. Odd that the tool could be so far off its specifications.
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post #29 of 30 (permalink) Old 01-09-2017, 02:43 PM
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Hey, Graham; good that your problem's solved, but I gotta say you're pretty calm about an obviously crap tool accessory!
Where did you acquire it? Did I understand you to say it's a RIGID brand item? Home Depot?

Bosch Router Sub-Base Centering Pin and Cone-RA1151 - The Home Depot
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post #30 of 30 (permalink) Old 01-09-2017, 02:49 PM
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Graham I wouldn't stick a screwdriver into the collet or twist it to get it loose. The screwdriver could nick or burr the inside and that could make it fail. If I get a collet stuck I tap the outside between the threads and it's end gently with the wrench or a pin punch and keep tapping and rotating it until it loosens.
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