The two long rods that pass up either side of the cylinder terminating at the little ends again started life as round stock rather than rectangular that Stuarts provide. Like the shorter rod the ends were first reduced to 4mm, threaded, then a small length reduced in diameter from the 12mm stock which will be the flange that bears against the cross piece.
Then with more stock drawn out of the collet and using tailstock support the rod was roughed down to 8mm diameter, this being the thickest part of what will be the fishbelly.
It was then back over to the mill and indexer to form the rectangular end, drill dummy holes and ream for the bearings.
Then once more back to the lathe to have the end 1/3rds turned to a taper with an insert that had a 0.8mm radius to leave a small fillet, hand blending of the three facets followed.
After sawing off from the parent bar the little end was mounted on an arbor to be rounded over using the rotary table. I seldom use filing buttons for this type of job these days.
A couple of bearings were turned and reamed from Colphos, here I am checking the size which was a nice push fit, bearings will be Loctited into place.
Four square head bolts for the dummy straps finish that part of the engine.
.Part one here Part two Part three Part four Part five
.
