How does a self-centering doweling jig work? That is, how does the
centering set-up actually function? There is the center and then the two
sides. I assume it is all in the threading, but what is the setup? I DAGS
and all I could find was how-to-use info. TIA. -- Igor
The threads reverse at the center section. There is a smooth section in the
middle of the threaded rods that ride in a bearing in the center part of the
jig, so the center piece never moves on the threaded rods. Since the
threads to either side of the center section are revered from each other,
both side either move in towards the center or out, as the threads rotate,
if that makes sense.
Like Rumpy said - that's the theory. I have one and it never
seems to line up perfectly - that's the reality. I don't
think that the thread rotation is perfectly in synch. (front
Not a bad jig to have around when you need it tho.
There's another kind of centering jig, too. The kind I'm familiar with
doesn't use threaded rods at all, but has two pins, with the drill
guide hole perfectly centered between them. So long as the two pins
touch opposite faces of the stock, the drill will be centered. No
moving parts, no adjustments.
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