Can someone tell me how to identify 1st gen box cranks from 2nd gen cranks?? Thanks in advance!!

Rick

square corners versus rounded corners

still a little unsure.. can someone tell me which ones these are?? sorry guys.. the size 180-805 is hand scribed on the back side near the spindle ..

1st

1st Generation box cranks were made with folded steel and welded on one edge. 2nd generation arms were made from tubular steel.

I thought those in the pics were 1st and the more
rounded ones were second?

Are the first generation 1 or 2 pieces? I think the first generation were made from a c section that makes up all but the rear of the arm. The c section is rolled and the 2 edges on the face are slightly rounded. The rear is a flat plate welded on to the c section and the welds are ground down flat forming a square edges. The second generation are formed out of a tube, all four corners are rounded more than the front corners of the first generation c section.

[ February 06, 2006, 07:09 PM: Message edited by: raybeard ]

Ben your correct. I don't think Alan was saying you're wrong. I think hes just expanding on the explanation.