How to set bit height in collet? - Router Forums
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post #1 of 55 (permalink) Old 02-11-2015, 08:34 PM Thread Starter
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Default How to set bit height in collet?

Ok folks, quick question....

I have a bunch of Craftsman routers. In my table is the 14 amp Craftsman professional router. While using it the other day, I noticed a bit of vibration. I removed the bit, cleaned the collet, and reseated the bit. Then I noticed a problem....

On most of the Craftsman routers, there is a spindle lock so that the bit can be tightened with one wrench. However, the lock protrudes enough such that it hits the shank on the router bit when tightening (and consequently, skews it just enough to induce runout, thereby causing vibration). From the safety side of things, this seems almost as bad as bottoming out the bit, as anything that prevents the collet from tightening perfectly seems dangerous.

If I raise it above the spindle lock, the bit runs true, presumably because there is no longer a side load while tightening. But the problem is, now the bit is considerably higher in the router, which is not a good thing for safety reasons.

I read the owner's manual, and all it says is to insert all the way into the collet and then back it off a little. I can't imagine Craftsman designed it so that I have to keep the bit this high, but I still wanted to check.

Any thoughts or recommendations?

Thanks
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post #2 of 55 (permalink) Old 02-11-2015, 09:04 PM
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...and all it says is to insert all the way into the collet and then back it off a little.
That is what I have been doing since the 80's.

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post #3 of 55 (permalink) Old 02-11-2015, 09:14 PM Thread Starter
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That is what I have been doing since the 80's.
Right, but if I do that with this router, the spindle lock hits the shank on the bit
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post #4 of 55 (permalink) Old 02-11-2015, 11:27 PM
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You got the model number or schmatic we can look at ,something definitely wrong.
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post #5 of 55 (permalink) Old 02-11-2015, 11:32 PM
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John I can't quite picture what you mean but you just need to make sure that 100% of the collet is being used. That is usually about 1" of shank. More won't hold any better but having less shank exposed makes it less likely to break a shank on 1/4" bits.

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post #6 of 55 (permalink) Old 02-11-2015, 11:36 PM
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Originally Posted by Copyright View Post
Ok folks, quick question....

I have a bunch of Craftsman routers. In my table is the 14 amp Craftsman professional router. While using it the other day, I noticed a bit of vibration. I removed the bit, cleaned the collet, and reseated the bit. Then I noticed a problem....

On most of the Craftsman routers, there is a spindle lock so that the bit can be tightened with one wrench. However, the lock protrudes enough such that it hits the shank on the router bit when tightening (and consequently, skews it just enough to induce runout, thereby causing vibration). From the safety side of things, this seems almost as bad as bottoming out the bit, as anything that prevents the collet from tightening perfectly seems dangerous.

If I raise it above the spindle lock, the bit runs true, presumably because there is no longer a side load while tightening. But the problem is, now the bit is considerably higher in the router, which is not a good thing for safety reasons.

I read the owner's manual, and all it says is to insert all the way into the collet and then back it off a little. I can't imagine Craftsman designed it so that I have to keep the bit this high, but I still wanted to check.

Any thoughts or recommendations?

Thanks
measure the length of the collet....
add a 1/16" or so...
that's how deep you need to set the bit at an absolute minimum...

still won't work....
up grade to better bits w/ longer shanks or remove the lock and go to two wrenches...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

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post #7 of 55 (permalink) Old 02-12-2015, 12:42 AM
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I bought a bunch of "O" rings that are 1/2" diameter and 1/4 diameter and place them on the shafts of my router bits. When I place the bit in the router the O ring keeps it from going all the way in.
I buy them at the plumbing section of Lowes and have been using this method successfully for many years...Works like a charm...

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post #8 of 55 (permalink) Old 02-12-2015, 01:47 AM Thread Starter
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I've attached the pics.

The first shows the bit tightened above the spindle lock.

The second shows the bit bottomed out and then raised ~1/16".

The third shows the spindle lock in the bottom protruding into the space where the shank would be.

The fourth shows the collet installed and the spindle lock protruding. Note that this still looks to be below the actual collet.

My question is whether or not this is safe to tighten it at the height shown in the first pic (which is probably 1/4"+ higher than bottomed out).
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post #9 of 55 (permalink) Old 02-12-2015, 02:10 AM
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Looking at the pictures kind hard to tell but I think you have installed collet wrong, it should be inside collet nut which would raise the nut a 1/16

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post #10 of 55 (permalink) Old 02-12-2015, 02:10 AM
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Hi John. Re: pic #4, does the spindle lock protrude into the spindle area when you are not depressing the spindle lock?

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