Reply by splintergroup

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Posted on Centering router's bit when router is in a lift?

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5122 posts in 2304 days

#1 posted 01-05-2021 02:48 PM

A year ago I revisited the router installation in my older Woodpecker PRL (looks almost exactly like jblmaine’s picture above).

I noticed that the router was not quite perfectly square to the surface so I spent some time setting it up square with the collar that secures the motor to the lift. These lifts are CNC machined and should be plenty well machined with their mechanism perfectly centered and square to the top plate. Any misalignment most probably is caused by the router not being installed correctly.

What I did different to correct my problem was to tighten the collar to my router motor until I could still just spin the motor in the collar by hand. I felt a small “thunk” and the motor loosened up a bit. I had tightened the collar while the motor was slightly cocked and the proceedure allowed it to pop into alignment. After snugging up the collar again, everything stayed true.

jb shows am excellent way to precisely measure for centering and if you let the indicator ride on the surface, it also will show you if it is all perpendicular to the surface.

If after being sure your router shaft is truly perpendicular to the table surface and these type of steps don’t fully correct any X/Y offset, you’ll need to try shimming between the motor and collar. Your 0.012” is not much and even a section of aluminum can or a few layers of paper can work in a pinch.

Also don’t be afraid to rotate the motor in the collar and try different positions. Any off center in the router motor machining can be used to compensate for any off center machining/assembly in the lift

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