Just one photo to show that I have not totally ignored the triple expansion marine engine. I have started to re-assemble it, having made almost all of the components. But there were quite a few finishing tasks put aside until later, which I am now tackling. eg lubrication points. I suspect that this will not be the final teardown and assembly.
The gunmetal base, with main bearings and crankshaft installed. The eccentrics are not finally positioned.
And some reminder photos from 2 years ago, of making the crankshaft.
The centres were drilled on the CNC milling machine, after the locating the top of the bar
Turning the second big end bearing. Note the packing to support the crankshaft after the first big end had been turned. The main bearings were turned last.
The finished crankshaft. Not much remains of the 51mm stainless rod.