Qustionable Crankshaft Grind

I just got my Atlas crankshaft back from grind and was surprised to find a lip on both journals just before the inner radius. Presumably this is because the grinding wheel ran into interference with the flywheel lip? Is this acceptable or should the crank be reground with the flywheel removed and the two cheeks bolted together? Thanks for any advice.

Domiracer66, The crank has to be dismantled in order for the grinding tool to access the inner radius, you do not have to bolt the two ends together, it is probably easier for the machinist if you leave them loose. Prior to dismantling do mark the flywheel as to which side it faces, the flywheel is physically symmetrical but the orientation is critical to retain the original factory balance. The radius on the crankpins is also critical as it prevents an area of high stress that would otherwise exist with a 90 degree cut. It is good practice to replace all of the studs and nuts bolting the crank together as the threads are often damaged because the nuts are peened over and rip them up on removal.

Hi:

The shop that does my reginds uses parrallels with the centre removed.
Bruce

Bruce can you describe how your grinder uses parallels in the grinding process? After splitting the crank it looks as though the best option for grinding the cheeks individually would be chucking up or using a center on the outboard side and using the locating dowel pin hole on the inboard side bolt pattern as a secondary locating/support point. Is this dowel pin hole on center line? Thanks again for the help.

Hi:
He explained he uses the bolts for the crank and puts parralels he has which take the place of the centre weight. I have never seen him do it,but I could go and have a look for you.He did the cranks for our norton dealer for years using this method.Our dealer passed away 17 years ago,but I remember he sent lots of cranks to him.
Bruce

Thanks Bruce, I guess I'm confused as why the flywheel can't just be removed from the equation, the two cheeks bolted together, and then grind the crankshaft as an assembly?
Kris

Hi:
I think the shop that does the grinding from the start just used the original bolts because of there good fit and used the parrallels close to the width of the counterweight. I suppose you could bolt them together without the parrallels .Check with the shop that is going to do it.
Bruce

If only seen a crank journal grinder once but from what I remember the main bearing axis is supported in some eccentrics. Maybe on the Norton crank the parallels are put on the grinder ways so the crank is supported on the rod journals lining them up with the center of the grinder. Hopefully you'd be lining up from a good surface. Then you could see where the eccentric needed attaching to the main bearing axis.
I guess there's not room on the grinder to just chuck up on the boss that locates in the flywheel.