Well the crank has not gone well. I ground a form tool as described and cut the four big ends first.
I achieved a nice finish with the lathe and then just ran some wet/dry around to polish the bearing.
Then I set up for the Mains , no matter how I tried I suffered vibration and a poor finish.
I tried adjusting tool height, different speeds , re grinding tool bits, ect but could not get the finish I achieved with the Big ends. I am now at the stage were I do not have enough material left to risk another bad cut so I am going to make up grinding wheel and see if I can save it by grinding down to size.
I am thinking the problem may be from cutting the Webs and Big ends first , weakening the crank and causing it to flex [vibrate]
Edited By David Kenyon 2 on 11/01/2019 13:20:25