Dovetail Jig Question - router bit height

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Forum topic by jtm posted 08-15-2014 02:31 AM 1076 views 0 times favorited 4 replies Add to Favorites Watch
View jtm's profile


230 posts in 1602 days

08-15-2014 02:31 AM

Hi peoples,

I have a question about my dovetail router jig.

This is my first time using one of these, and I can get a close fit, but the tails are slightly too big for the pins.

I know that reducing the bit height will make the tails smaller, but I’ve run into a problem. I have the bit as low as it will go without hitting the inside of the bushing (and it may have hit it a tiny bit already). This is still too high to get the tails to fit well (I can hammer them in, but that’s too tight).

I figure there’s a reason that the bushings are made out of a soft metal like brass, but I just wanted to check with you guys first.

Is there any reason not to retract the bit a little and rout away some of the brass? I know it shouldn’t hurt the carbide, and I’m not too concerned about the accuracy of the INNER diameter of the bushing.

Just wanted to get some suggestions.


4 replies so far

View TheFridge's profile


9249 posts in 1451 days

#1 posted 08-15-2014 02:39 AM

A rat tail file would be my solution.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View ajosephg's profile


1880 posts in 3526 days

#2 posted 08-15-2014 08:58 PM

What brand of jig do you have?

-- Joe

View kdc68's profile


2649 posts in 2242 days

#3 posted 08-15-2014 09:49 PM

I’ve ran into your situation where the bit needed lowered a minuscule amount for a proper fit but couldn’t because of the brass bushing. My fix was to apply wide masking tape over the router base plate. This thickens the base plate and in essence lowers the bit without the hassle.

-- Measure "at least" twice and cut once

View Sawdustonmyshoulder's profile


474 posts in 3593 days

#4 posted 08-15-2014 09:49 PM


Sounds to me like you have the wrong bit for the jig or the type of dovetail (ie: half-blind, through) that you are cutting. This info would be very helpful in determining the problem. I have two dovetail jigs and each one has certain bits for certain dovetails.

Here is what a bit should look like for half-blind.

I certainly wouldn’t allow the bit to cut into the bushing. It could loosen it and cause a real danger.

Here is my first attempt at using my PC 4216 dovetail jig.

Hope this helps.

-- The more skilled you are at something, the worse you are at it when someone is watching.

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