Reply by splintergroup

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

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5133 posts in 2307 days

#1 posted 01-05-2021 05:22 PM

Another simple technique that I used before resorting to the dial gauges is to select a guide bushing with either a 1/2” ID (best) or a 1/4” ID if you don’t have a 1/2”.

Hopefully the bushing has a good fit into your insert for a permanent fix, but some slop can be useful.

Assuming you have your router mounted as vertical as possible, chuck up a 1/2” drill bit or other precision 1/2” rod.

With the bushing installed, you should be able to “coax” the router enough to allow the shaft to slip in/out of the bushing as it is raised/lowered.

If your bushing has some slop in the insert, you can raise the router and slide the bushing retaining nut over the shaft and let it slide down to the router. With the shaft raised above the table surface, slide the bushing over the shaft and into the insert.

If you have enough hand room underneath, you might be able to spin the nut onto the bushing and snug it up a bit, effectively centering it. Lower the router so the shaft is out of the bushing, carefully remove the insert and tighten up the bushing.

Reinstall the insert/bushing with the same indexing and you should be near dead centered.
This worked well for me, but with a different lift there may be issues that make it un-doable 8^)

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