I started on a Longworth Chuck to suite my lathe which only has a 13 inch diameter swing ability over the bed.
So I am at the stage of getting my arcs cut out in the two discs of plywood that i am to use for the chuck.
Here is my issue that i have been pondering all weekend. I have made a circle routing jig for my PC router to be able to cut the arcs.
The arcs pivot point due to size of disc 13" and the size of my faceplate 2.5" means that when i rout the arc the pivot point for the next arc is in the path and will disappear.
I need some wisdom on how to overcome this. I have come up with some crazy methods but they are too way out. I am sure the wisdom here with slap me silly with a why didnt I think of that.
So i need some spinny help if i am to get this chuck finished.