Original Model a crankshaft material

The good news is forgings are very strong with superior fatigue life due to their continuous micro grain structure. The bad news is machining a forging ruins its grain structure continuity which causes stress risers and reduced fatigue life. Castings are typically not as durable as forgings, but grain structures are not an issue in castings.
Castings allow more complex shapes which makes them less expensive to manufacture. However, metallurgy plays a larger role in the ruggedness of castings.
 
Last edited:
the early crankshafts are forged, later cast out of heat treated EE steel , the blueprint has a note that the forged crankshaft is machined to the tolerance as the cast
 
Kurt in NJ said:
the early crankshafts are forged, later cast out of heat treated EE steel , the blueprint has a note that the forged crankshaft is machined to the tolerance as the cast
Click to expand...

Hmmm Kurt, I'm not sure that is what that is saying. I read it to say that on that particular print, all dimensions on this revision are to be the same as what is found on A-6303-A1 and 6303-A2 Forgings drawings. I don't read that comment to say this is not a forging but only to say that the machining department needs to refer to all previous prints in case of a question or discrepancy.

Additionally, because this drawing was just a final clean-up of other revision drawings, you would need to refer back to EI #s 12200 and 17014 to find what changes were being made.
.

.
.

.
 

Attachments

You must log in or register to reply here.
Back
Top