I have made LH cranks for my own use. What a PIA. I think i counted 15 setups to make a crank.
??
1: Chuck stock in 3-jaw, turn & polish bearing surface, prop mount, prop shaft (or hole for same), and front face of crank
2: Turn, wrap beer can around bearing surface, drill hole for intake
3: mount in offset holder, put holder in chuck (maybe swap to 4-jaw to dial in the stroke), turn pin and counterweight (thunkity thunkity thunkity)
4: Mount on V-block,
carefully align crank pin, drill/mill/whatever the intake hole. Mill flat on prop mount if that's what floats your boat.
If you're not going to heat treat and a D-shaped prop drive is enough -- you're done and I'm confused. Even if you are heat treating then I come up with two more setups (one to finish grind the bearing, and one to finish grind the pin), and I'm
still confused.
Granted, as wannabe machinists go I'm a lot more "wanna" than "be". So I'm not criticizing -- I'm wondering what the other 11 (or 9) setups are?