I have been using a router collar guide and jig to cut mortises on my last two projects. My one complaint is that the collar is not necessarily centered on the router bit. This leads to mortises that favor one side or the other by almost 1/32″. Stop laughing at me. Does anyone know a trick for centering collar guides? Or a brand of collar that does not have this flux?
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Replies
Get a centering jig for your router. You chuck it just like a router bit, but at the end it's sort of a cone or bulb. You slide it in or out so that its circumference contacts the guide, which is firmly mounted to your router's subbase. Then loosen the subbase and get it so the collar is dead centered on the centering jig, and tighten it down. Now your collar's center is the same as any router bit's center.
EDIT: These jigs cost less than $5. I got mine at WoodCraft.
Edited 2/17/2006 7:49 pm by John_D
Some routers, like Porter-Cable, have counter sunk screw mounting the bases on their routers so you can't really change the base position at all....it just goes to the base hole positions. The problem you have can be improved with marking one handle side of your router base and you would need to watch that side during router placements and subsequent work involving the routed parts.
Not the perfect fix but a large improvement over pot luck routing from an unknown alignment. I've done it for my PC's and it will help you.
If you can "recenter" your bases, the center tool/bit is your perfect bet.
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