In "Engineer to Win" Carroll Smith tells about the time that someone decided
to make Can-Am rear halfshafts out of maraging steel. This is a superalloy of
sorts with a very high yield stress and is used in a lot of applications where
light weight and high strength is required. Unfortunately it has very poor
tolerance of repeated stress reversals, and a lot of people broke a lot of
halfshafts until they read the full spec on the material.
I'm not saying that Monel is the wrong material or that the "caterpillar bolt"
material used by Derek White was the wrong material for fulcrum pins, but the
needs of the fulcrum pin application should determine what the right material
is, not the fact that a particular alloy was used on a boat, backhoe, or the
Space Shuttle.
Dale and Doug's pins are not that expensive in the context of a full front
crossmember rebuild, especially if you factor in any required straightening or
reinforcing of the crossmember. Just buy the things from them... you know that
they will be made from a suitable material, they'll be machined properly using
the appropriate tools, and they'll fit.
Cheers,
Theo
----- Original Message -----
From: Tony McNulty <bamcnulty@optonline.net>
Date: Tuesday, February 10, 2009 6:01 pm
Subject: Re: [Tigers] Fulcrum Pins (Tigers Digest, Vol 3, Issue 49)
To: TIGEROOTES@aol.com, tigers@autox.team.net
> I'm looking into monel as a possible material -- I recall that
> the USCG used
> that for prop shafts on the 40" utility boats with twin Jimmy 6-
> 71's.
> Rarely broke under the worst kinds of conditions imaginable.
>
> Anyone have the proper machine drawings for these critters?
>
>
>
>
> ----- Original Message -----
> From: <TIGEROOTES@aol.com>
> To: <tigers@autox.team.net>
> Sent: Tuesday, February 10, 2009 6:49 PM
> Subject: Re: [Tigers] Fulcrum Pins (Tigers Digest, Vol 3, Issue 49)
>
>
> > request@autox.team.net writes:
> >
> >> A number of years ago Derek White has some pins made in
> Africa. They
> >> were
> >> purported to be made from steel used in Caterpillar tractors.
> >>
> > Tom,
> > Brent Edinger and I
> purchased several sets of fulcrum pins from
> > Derek
> > and they were completely unacceptable. None of them were
> the same length
> > as
> > eachother, the slots on the sides were randomly cut and the
> machined ends
> > were
> > also completely different lengths on each pin.
> > Jim Leach Pacific Tiger
> Club Seattle
> >
> >
> > **************
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