Last few days I have been working on the crankshaft main bearings (item 12) and the crankshaft main bearing locking rings (item 13). Fortunately I had a piece of phosphor bronze of the right length. Can't remember why I had it.
First made the bearing blanks and another blank for the locking rings.
Finished off the locking rings first by drilling and boring to fit the bearing blanks.
This material is a real pig to drill.
After finishing the rings I replaced the 3 jaw chuck with a collet holder and drilled 9.8mm and then reamed 10mm.
Finally, the moment of truth. Will I bores of the bearings align with each other? Used a 10mm ground shaft from an old printer to check. Managed to line them up but it was very stiff to turn. Eventually I managed to make the shaft turn freely with lots of playing around with the frames.
Vince