[Vwdiesel] Camshafts ---- ( missing key mystery )

[LBaird119 at aol.com]

  I'd expect the slot is what would be used for locating the cam.  It'd 
be a bit tougher to locate to a half moon slot.  My speculation is that 
it still has to do with the blanks but it's part of the roughing process 
and it's simpler to let them all get keyed along with the gas cams.  I 
forget exactly how it's all done but as I recall, a cam grinder only is 
indexed on a lobe and then follows the cam pattern and then indexes 
it's way to the rest of the same lobes then the other (intake or exhaust) 
pattern goes in and the remainging lobes are ground.  Most cranks are 
ground similarly.  That's why blueprinting a crank is possible.  They're 
only ground so  close instead of exact indexing.
    Loren