Circle Maker

I needed a jig to let me saw circles on my bandsaw and I realized I could also use it to route circles/semi circles on my router table.   I also decided I didn't mind a 5/16" hole in the center of my circles.   I needed to add a tee track to the edge of my bandsaw so I did some routing on a 14" piece of wood and drilled a couple of holes and shazam, I had a tee track on my bandsaw.  
So I cut a 14" by 12" piece of 1/4" plywood, glued a 5/16" peg near the top, drilled another 5/16" hole in the lower left, and routed a 5/16" curved slot on the right and I had a circle maker.  

Its 2021 and I have a different bandsaw, I don't want to add a piece of tee track to the outer edge of the bandsaw's table.   I realized I can use a miter bar in the bandsaw and router tables.   The advantage of the previous circle maker using a tee track, it was easy to tighten the tee nut and lock the slider into position.   Now, if I use the miter bar, I have to come up with a way to secure the circle cutter.  

The circle maker base ready to use.   The peg at the top is a 5/16" oak dowel, the center of rotation.   The two fixed 5/16" holes at the left allow me to increase the distance from the cutting edge.   The slot on the right is the final fine adjustment of cut radius.

Tee track wood support bolted to the side of my bandsaw table.

You can see the shape of the wood support bar, I left a lip at the bottom so it would be easy to align when I removed the tee track to replace the bandsaw's blade.

A view of the tee track from the front of the bandsaw.

Sawing a circle on the bandsaw.

From farther away.

Blocks before and after sawing circles.   These are bases for a paper towel holder.

I used the circle maker to saw the circles and route out the circular channels for holding weights in the bottom of the paper towel holder.

Using It On The RouterTable

The jig on the router table.   I use it to route curved slots (like the on on the right side of the jig).

Closer look at the peg and router bit.   This is for routing a curved slot.

Making guide bar for the cylender maker.

Align the piece with the left 45° mark.

Then rotate it around to the right hand 45° mark.

And you get a 45° semi circular slot like this.

Viewed from a little angle.