I've read a number of posts over time about slipping router bits. Yesterday
I bought a new bit and was cleaning the protective film off the bit prior to
use when it occurred to me that may be the reason for slippage.
Does anyone else clean their bit shaft prior to use?
Before using, the shank of a router bit should be bare metal, no film, no
covering or greasy residue at all. When I buy single new router bits, they
usually come in a little hard spastic case. There's no 'film' to remove, the
shanks of the bits are bare metal and they are usable as is. However, when I
have any of my carbide bits sharpened, they come back with a protective wax
like substance encasing the carbide portion of the bits. That, I tear off,
give them a simple wipe with a cloth and then use them as is.
This depends on the manufacturer. Looking at some of the cheaper bits, they
have a varnish style finish applied to them so they don't rust until put to
use by the buyer. Moving upscale a little (pardon the pun), the cutters can
be protected with a rubberised dip and/or covered in a protective varnish.
Good quality bits such as CMT etc have only the packaging to protect them.
It varies a lot (where I am anyway) so I always give them a wipe, just to be
I always wipe the shaft of the bit off before inserting it in the collet.
The only time I've had a bit slip is with a Craftsman router. In this case it's
the design of the collet. With the particular Craftsman router I have, the
collet is conical and there is only about 1/4" (the very tip) that comes in
contact with the bit's shaft because of the way the collet is designed. With
the other routers I have, the collet is cylindrical and grips the shaft along
the entire length.
Buffalo, NY - USA
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Actually, I had a bit slip in my PC 690 not too long ago. But it was a
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