Randall Young writes:
> That's absurd !
I agree. Prices may be higher in CA, but a 7-journal crank shouldn't cost
more than about $80-90 to grind to the next undersize.
Here's the other silliness--sending it off to have the scroll ground off.
That can be done at the same time as grinding the journals to size. Might
take one additional set-up to get the correct radius on the sides of the
crank grinding wheel, but I doubt even that would be required.
As for more grinding required after nitriding (more likely Tufftriding,
these days), the journals will grow, and they will be somewhat discolored.
Tufftriding may cause a journal to grow by about 0.001", I think, so the
simplest procedure is to grind slightly undersize, maybe 0.0005" (based on
the recommendations of the nitrider for that journal size), nitride, then
polish the crank to the standard dimension. That still leaves a few
thousandths of harder material, and cleans up the discoloration and the few
iron nitride nodules that are formed on the surface.
That said, it is possible that the $220 crank grinding fee included the cost
of nitriding and polishing afterwards. But the only way to know for sure
would be to have the surface hardness of the crank checked. A shop doing
nitriding could likely do that.
Cheers.
/// triumphs@autox.team.net mailing list
/// or try http://www.team.net/cgi-bin/majorcool
/// Archives at http://www.team.net/archive
|