Posted by ScottyHOMEy on June 19, 2010 at 19:43:08 from (64.222.222.226):
In Reply to: Super A crankshaft posted by nickc711 on June 19, 2010 at 18:31:32:
Are you dealing directly with the machine shop or dropping your crank off with a local shop tht will job it out? An idle question really. Last one I had ground, it was closer to the shop with the lathe than to the nearest jobber. I took it there myself.
Was pretty impressed. He asked wht it was out of, and went straight to a manual about the size of the MAnhattan white pages, and looked up the original specs to match the part number on the crank. Pulled a mic out of his pocket and went across the rods and mains. Told me tight off bat that it was worn enough that he knew he could turn it down .010 but might not be able to polish it, might have to go the whole .020. He made a point of looking at the shaft to see if any machinist had turned it down before, and left a mark to indicate that, the same kind of mark he left when he was done. Just like watch makers used to engrave the date of every cleaning or adjustemnt under the back cover of the watch, these guys stamp into any crank they work on how far they have turned it down, with codes for the rods and the mains.
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