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Reply by Kelly

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Posted on Band Saw Circle Cutting Jig Problems

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Kelly

245 posts in 1696 days


#1 posted 06-09-2010 08:02 PM

The circle jig I made yesterday was just an 8”x8” piece of 3/4” ply with a miter guide glued and nailed to the bottom. The miter guide was secured so that the left side of the plywood just kissed the blade.

I then ran it though the band saw and shaved off one gazillionth inch of plywood. Now I could measure from the blade side to get the radiuses I needed for five circles I’d be repeating regularly.
I then drilled holes that would accept my [low tech] rivets (snipped to about a quarter inch, or just under. Each hole was for a different diameter circle, of course.

Because the radius dimensions would have put the holes for the pivot pin very close together, I shifted their positions forward and back. This required me to move the jig forward or back in the miter tract to line each pin hole up just in front of the blade required moving the jig forward and back.

To make the jig quick to align, I just used a square to scribe a line from the center of the pivot pin hole to the blade edge of the plywood. I used a felt tip marker to darken the lines and to write the circle diameter for each pin hole.

To operate, all I have to do is push the jig forward until the line of the pivot hole I am using lands immediately in front of the blade. Since I have a couple of those wonderful switching magnets, I set one down at the end of the jig and turn it on, to act as a stop.

Now, I drop my over-sized piece of wood on the pivot pin, push it into the (by then running) band saw and, once I hit the stop, start turning.

If need be, I can try to take some pictures of this ridiculously simple (and easy to store) beast for posting.

SIDE NOTE: You can test for the binding problem this thread started from by backing up just a quarter inch and see what happens.


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