I envision a plunge router constrained by a bushing riding in a slot cut to the correct length and at right angles to the board being cut. But, how to index either the router or the wood in equal steps? Anyone have a clever idea how to accomplish this?
BTW I did consider routing completely through a wide board and then cutting the correct width out and gluing strips to the edges but that would leave me with square ends to the slots and I would prefer the same rounded appearance.
Yep, that's basically how I would do it.
Index them? No prob. Clever idea? Don't know if I'd go so far as to call it that.
Don't know how clearly I can get this part across. I'd rout the correct size slots, at least two slots, completely thru a piece of plywood, at least 1/2" thick. Gluing, nailing, or screwing, a guide strip under one edge, so that the slots would be centered on the work piece as I wanted. Position the jig so the first slot is exactly where you want to rout in the work piece, clamp in place, rout, then the second, or more, slots will also be in place so rout those too. Loosen your jig. Slide it along, until the last work slot is centered exactly under the thru first thru slot. If you wanted to get fancy, you could make a fixture that would fit in and align it just so, then clamp. Rout as many holes as you have free in the jig, repeat as needed. And that's how I do things like that, with not enough inaccuracy to be able to tell. Except instead of clamping my jigs down, I usually tack them down with slim nails, but that leaves nail holes, which I'm thinking you don't want to have.