I got a couple hours in yesterday afternoon, I started by lapping in the central dovetail block into both the subassembly guide rails, and the base guide rails, respectively,
here is one side of the block without any lapping done to it, it is rough on the top inside of the dovetail, this could have been prevented if I would have taken light cuts on the mill, however. I knew I would lapp this in, so I took substantially deep cuts, around 0.200” at a time, so the reason for the roughness.
here is the lapping compound spread onto the dovetail of the central block, I just apply very thin film of it
Here is the after lapping of one part of the block,
everything is smooth sliding, with little play, there will always be some play with this kind of sliding joint, due to the need for extreme ease of travel, by hand pressure, ususally for a dovetail slide, you want it to be almost zero play, which is where adjustable gibs are used, however, with that, you then need to move the slide via mechanical means, usualy a screw thread, because of the snugness of the sliding joint.
If I wanted a very good sliding fit with zero play I would have gone the rout of using a round bar and reamed bearings.
Now it’s time to start the front fence assembly
when I placed the guide rails on the base plate, I wanted some extra space to put a substantially long support block in to stiffen the fence front with the base plate.
So after some measurements
I can start making the two support brackets.
need to check to see how it fits in with very little gap on top.
now the marking off and machining of both blocks together as one piece.
and cutting it into two pieces for each side.
and a quick check for fitting in place.
Next is to attach these blocks and the front fence, then start working on the depth fence, for holding down the jig tight to the workpiece for edge mortising.
A few hours of shop time at a time, but it is coming together a little at a time.
have fun in the shop.