In the latest issue of Shop Notes, one of the tips is to put a dab of
silicone caulk on the end of router bit shafts to prevent them from
bottoming out in the router. Esentially, making a small silicone "stopper"
on the end of the router bit shaft.
Couldn't this be potentially bad for the router because the silicone could
put the bit out of balance? Granted, it would be just a little out of
balance, but since they spin at a bazillion MPH (it seems), I think it would
be a bad idea. It's not that difficult to keep them from bottoming out.
Anyone else see this and/or have an opinion?
Considering the very low weight of a dab of silicone that small and as close
to center that it would have to be, it would have no noticeable effect. It
would work but is more trouble than it is worth. You're right, it's not that
hard to keep the bit off the bottom. A lot of the tips I have seen in
magazines were obviously included not because they were a good idea but more
because they have space to fill.
Silicon blobs will get knocked off and fly around the shop like flubber. Use
an 'O' ring instead, if you're that worried about it. Should be able to get
a packet for a dollar or so from any gardening department.
Uh, Grogs, HOW will the little silicone blob fly off the
tip of the shaft--which is now buried inches deep in the
collet and motor shaft of the routah?
O-ring it is.
-If thy poster offends thee, *PLONK* it out.-
http://diversify.com Comprehensive Website Development
tip in some other current WW mag was to use small piece of 1/4" vinyl
tubing to prevent the "flare of the router bit from being engaged by the
collet. one foot would slice up into a bunch of spacers.
Mike Dembroge wrote:
Yeah, but when you need one hand to hold the router, one hand to
operate the wench er.. wrench and one hand to hold the bit up that
tiny amount you seem to run out of hands before the job gets done.
On Sun, 21 Sep 2003 02:09:31 GMT, "Courtney Mainord"
Exactly the same thing you are trying to do with the little blob of
silicone the OP was commenting on. I suspect that many times the shaft
on a bit isn't long enough for the silicone trick to work, but it
might in many cases. My only real concern with that idea is how do you
dig the little piece of silicone out of your collet after it detaches
from the bit, as I'm sure it would for me. I like the o-ring idea
better, but the silicone one is still a valid thought.
======================================When did you meet my Dad...? lol
He is now long gone but years ago I was in my shop "playing" when he
stopped by the house and suggested using a small "o" ring...
30 or so years ago and I have been using "o" rings ever since..and leave
them on the bits...
I hope you're not 'trolling' ?
Anyway, the idea is to use an 'O' ring that fits the shank of the bit
1- put the ring on the shaft and 'roll' it right up to the cutter
2- insert the bit till it 'bottoms out'.
3- raise the bit a 16th or so for 'clearance'
4- hold the bit in place with side pressure from your fingers, and roll the
ring down to the chuck
That's it; that's all there is to it. Adjust the 'technique' depending on
the length of your bits & the depth of your chuck.
Regards & Good Luck,
There are two scenarios here that need to be addressed:
1. The shaft of the bit is longer than the depth of the hole in the router
In this case the bit needs to be prevented from bottoming out hard.
Installing an O-ring with an o.d. equal to the i.d. of the router shaft at
bottom of the router shaft cures this. If a bit bottoms out there's still
"give" for the collet to pull the bit down a slight amount when it is
2. The shaft of the bit is not long enough to bottom out but if it is not a
bit there will be a fillet where the bit shaft meets the cutter head.
This is where putting an O-ring with an i.d. equal to the bit shaft o.d.
bit shaft to prevent the collet fingers from trying to tighten up on the
I hope my 2 cents helps. ;-)
Ron Magen wrote:
I've never noticed a problem with it. I set the routah (PC-690) on
its side on my bench, put the bit in so it bottoms out, pull it back
out just slightly, and then hand-tighten the collet nut. Then I set
one wrench around the bottom nut, lean that wrench handle against my
benchtop, and engage the top wrench and tighten by pushing down
against the wrench that's supported by my bench.
I do a final check by putting the routah on it's head and grabbing
the two wrenches in the palm of my hand and squeezing (i.e., levering
them against each other).
I'm no routah expert (in fact, I don't like using the thing), but
in the time I've been using one, I've had zero skinned knuckles and no
bits fly across the shop, or break or "self-adjust".
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.