At 03:57 PM 10/25/2008, Tony Drews wrote:
>I'm trying to help one of the list members buy a connecting rod, and
>the rod manufacturer wants the small end and big end weights of the
>existing rods to match to. Then it occurred to me - I have no idea
>how to go about doing that. Anyone know the technique for weighing
>each end of the rod? This is just for future reference for me, but
>may help out my cohort.
>
>Thanks, Tony Drews
Tony, my first attempt at balancing my own rods involved weighing
each end, then grinding to match. Perhaps a workable plan, but I
came up with an even better method.
Anyway, the fixture I made supported one end while I weighed the
other. Having the rod exactly horizontal didn't seem to be
important. I found some small ABEC 5 (fairly high quality, from
McMaster Carr if memory serves) ball bearings. I made a vertically
adjustable T fixture from scrap Aluminum. Into the upper piece I
threaded a 1/4" bolt, on which the bearings sat. One end of the rod
was suspended on the bearings while the other end sat on a beam
balance. It's important to use 2 bearings, or a very wide one, so
the rod doesn't wobble.
BTW, I tried simply balancing the rods on a nail, but the coefficient
of friction was too variable to give reliable results. That's why a
set of quality bearings are needed.
jim
--
J.C. Hassall
Blacksburg VA
'63 TR4 in autox preparation
96% finished, 90% to go
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