Opened up a new Dovetail Bit yesterday and looking at it thought that the shank was too long. I installed it as is with well over an inch protruding from the collet. In use there was some serious chatter. So I took it out and cut about
3/8inch off the top and it works fine.Strange! Its a Porter Cable Router and a Porter Cable Bit.
You need to remember, each time you use the router, that you already put an o-ring in the collet. They add up!!! Interesting problem/solution. One to remember. Thanks for posting it.
What tool did you use to cut the shank of the bit?
Sawzall with a Bi-Metal Blade. I believe, because it is a carbide tipped cutter the shank, etc is fairly soft steel. If it were a High Speed Steel cutter I might not have been able to cut it so easliy. After cutting I beveled the top edge with a file.
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