Stuart Victoria
The Crankshaft

The crank was set to run true in the 4-jaw chuck so that a concentric step could be machined to suit the hole just drilled in the crank web.
A collet chuck could also be used but one the correct size was not available. 

The crank was pinned to the crankshaft and the outer face machined to bring the part to final thickness.
Also in this setting the small end was faced to final thickness using light cuts because of the intermittent cut.

The small end of the crank was drilled on the drill press making sure the table was set as square as possible to the drill axis.
Absolute accuracy would not be needed because the hole would be used to hold a shouldered pin which should pull itself square to the machined faces. However the hole should still be drilled as carefully as possible.

The crank pin was turned in one setting just using the 3-jaw chuck. The diameters and steps were turned using a sharp point tool to create nice crisp corners.

The crank bush was turned to be a push fit in the connecting rod and was reamed to be a running fit on the pin.
The length of the bush was progressively reduced until it was a free running fit on the pin with the nut fully tightened up.