Hello All:
I'm sure some of you have seen Jeremy Schmidt's tablesaw fence with incremental positioning. I had thought about making one but I really like my old Delta Unifence. I spent quite a bit of time trying to figure out how to integrate incremental positioning with my Unifence but was just coming up empty. Then I saw Bob Neumann’s set up on Instructables and that got me going.
My fence ended up being a composite of their two approaches.
I used 3/4-16 because I thought it would be strong enough on its own with support along the whole length like 3/8-16 would need. Nut and Bolt supply sells the 3/4" threaded rod for less than Ace would get for the 3/8". I only supported it at each end with simple blocks made from scraps. I also included Jeremy's feature to rotate the threaded rod as a micro adjust. The nuts grip the support block fairly tightly so it won’t rotate on its own. Its simple to rotate the nut by 1/12 of a rotation (from a flat to a point) which gives a travel of ~0.005 inches. Nuts are held by loctite to prevent coming loose without needing two nuts on each side of the support block.
I followed Bob’s approach of using a piece of spring steel which I screwed to the Unifence head. I attached a half-coupler-nut to the spring steel with epoxy since I don’t have a welder (I'll add screws to reinforce the epoxy). I did not implement a toggle clamp like he did because I can micro adjust and don't need to use freehand positioning. So my half nut and spring are set so that they always engage when I position the fence. If I find that I want the ability to slide it without engaging the teeth I can always modify it later.
So far so good. Of course it took a lot longer than it should have and I drilled several more holes in my fence rail than necessary. Just to see how repeatable it really is, I dialed in the fence for 4" then removed and replaced it. See the pic.
Cheers,
Jim
Incremental Unfence 1.jpgIncremental Unfence 2.jpgIncremental Unfence 3.jpgIncremental Unfence 4.jpgIncremental Unfence 5.jpg
Cheers,
Jim