Got most of the rest of the lube pump done (waiting on an order of a bunch of sizes of steel balls for check valves, and viton rings for pistons/shafts/etc for the rest of the engine). The pump plungers are simple shafts with discs silver soldered up at the tops, to ride on the cams.
For the eccentric straps, was about to dig out some flat bar stock, when I noticed that Kozo milled his down out of discs of brass - I happened to have a piece just big enough left over from making the bevel gears, and split it down with a parting tool on the lathe to make two discs, one for each pump strap.
Before sawing the disc into two halves for top/bottom of the strap, I milled in some flats and drilled/tapped for the bolts that will hold the straps together. Doing it now meant that the two halves would line up correctly.
Then sawed the disc in two (not in the center, since there is a protrusion on one side to attach the conn-rod) with a slitting saw.
With the two halves screwed back together and held in the 4-jaw (one jaw turned around to give clearance to the lathe bed), I bored out the centers to match the eccentric diameter (the eccentrics were made along with the wheels, and are already on the axles).
Then moved to the mill, and held the strap from the inside with the 3-jaw on the rotary table, and milled the arcs on the outside, leaving the bolt extensions and the con-rod flange. Kozo did this without a rotary table (dont think he has one, never saw it in the books). He held the strap on a vertical post, and did a whole lot of plunge cuts, moving the strap a little around the post between cuts. Much faster with the table, though end result is the same.
Last step was to slot the attachment flange with a slitting saw.
Last photo is the pump assembly on the left, and the eccentric strap for the feedwater pump on the right. That pump and the hand-pump come next.
After that, the real fun begins - the boiler! Gulp. :hDe:
