Looking for a arc jig that I can build that is not a 1/4 piece of wood with a nail use as a pivot point. I have a slew of jig I use for making poker tables but here of late I have been getting orders for sizes I do not have jigs for. I have used the nail thing and it works but its not all that accurate.
I was thinking of ataching the pivot point with carpet tape and having an adjustable arm of 25 inches so that I can use a full sheet of ply to make the tables from or smaller. Would like to have a bearing pivot point of 1/4 inch. I can invision what I want but was hoping someone has built a hi-tech jig...
The circle jigs that everyone on this forum makes seem to work fine and are very accurate. Try going up to 1/2" stock and a 1/4" pivot. I use a 1/4-20 bolt and cut off the threads (i.e. buy one long enough so that the unthreaded portion protrudes at least a 1/2 inch). You don't need a bearing for this since each time you use it, you make a new hole. For the jig, use a 15/64 drill bit for the pivot hole and press the bolt thru. You may need to ream out the hole a bit but if you have a letter index, a C bit would be perfect. This will hold the pivot tight in the jig.
I've heard of carpet tape (double sioded tape) used for various purposes and it will probably work here as well if you make the base large enough. You still don't need a bearing but since you're using the same pivot hole over and over, you may need to re-drill the base after a number of uses.
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