"Electric Comet" wrote in message
I don't use a router often but recently I dusted both of mine off and
got a surprise. I was using a 1-1/4-inch x 1/4-inch shank flush trim
bit and I thought my router was broken.
But after some routing and closer inspection I found that the bit just
isn't stiff enough at top speed to remain straight. It is easy to see
it and when I tried to use it it was easy to feel it and hear it. It
caused the whole router to vibrate and caused a lot of chatter. I tried
in the other router and the same thing but to a lesser amount. I've got
a bit that has a 1/2-inch shank and finished what I needed.
Two things occurred to me.
1 the bit has two bearings and they both need to rest on the material
i wasn't doing that because the bit's longer than the material's
thick But even so a router bit needs to remain straight and stiff
and this doesn't at ~23,000/rpm
2 1/4-inch shank is not the way to go for a flush trim bit, needs
to be a 1/2-inch shank to maintain proper stiffness and avoid
the horrible deflection.
maybe it'd be ok at lower rpm but both routers are full on or
off
1/4" shank bits are fine. Possibilities...
1. Bent bit
2. As sonny said, bit isn't properly seated in the collet
3. Collet is worn or not properly seated
4. The bearings - the router bearings, not the bit bearings - are worn.
--
dadiOH
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