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I was building a off-dock crane to unload containers from a barge. I wanted to have a rotating crane supported on a tube structure on a circular platform with a lower man-platform also circular. I needed a circular base plate to attach the tubes base to the concrete pylon foundation; again circular.

 

To cut the perfect plastic circles in 1.5", 2" and 3" diameters without having any internal circular hole I used Carter's accuright circle cutter that attaches to my band saw table. See below:

 

 

http://www.carterproducts.com/...rightr-circle-cutter

 

This creates circles of any diameter(depending on the band saw blade size) up to about 4 feet in diameter.

 

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Originally Posted by AlanRail:

I was building a off-dock crane to unload containers from a barge. I wanted to have a rotating crane supported on a tube structure on a circular platform with a lower man-platform also circular. I needed a circular base plate to attach the tubes base to the concrete pylon foundation; again circular.

 

To cut the perfect plastic circles in 1.5", 2" and 3" diameters without having any internal circular hole I used Carter's accuright circle cutter that attaches to my band saw table. See below:

 

 

http://www.carterproducts.com/...rightr-circle-cutter

 

This creates circles of any diameter(depending on the band saw blade size) up to about 4 feet in diameter.

 

Neat. Good tool.  I've used a jig I made to cut circles with my bandsaw and I think it used the same idea.  

Lee

 

I made a circle cutter as well; however with Carters you don't need to drill a hole through the stock for the pivot just a punch on the underside. You slide the stock into the blade on a tangent point cause the stock sits on a sliding pivot point; when the pivot locks in place you start the rotating cut. So the blade point hits at a circumference point and not the flat of the blade where a slight flat can be created.

 

Also the various size circles can be cut by just sliding the arm toward the blade and setting the built-in scale to 1/2 the circle diameter or the radius of the circle.

 

Once I finish the crane I'll post pics.

 

 

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