The most common thing I see when we regrind a Model A crank is that the previous shop didn't indicate off the true centers of the crank; the flange and crank gear surface. Other most common thing I see is that the previous shop ground the radius off the rods and mains.
We always maintain the radi as this is the internal strength of the crankshaft.
What these pictures represent is the "As Ground" finish of the crank these aren't polished yet. Referring to Joe K, Not all grinders do a crummy job.
The crank has to be straightened before grinding as well as magnafluxed; the hammer routine "ring test" doesn't prove the crank isn't cracked.
Russ40: If you have to explain how to grind a Model A crank to a crank grinding shop I would suggest you find another shop that needs no explanation.
As with any machining operation there are many ways to achieve a good job and many to do it wrong.
If you ask the right questions which the grinder should know, is mag. straighten ,grind, maintain radius, indicate off unworn machined gear and flange surface and grind to the size you desire.
If he is a know it all then find another shop.
Yes we are located in Massachusetts.
http://www.jandm-machine.com/