[DeTomaso] Cable Shifter

michael@michaelshortt.com michaelsavga at gmail.com
Fri Aug 31 18:34:41 EDT 2012


Couldn't they also be made of CF like a fishing rod, golf club, sailing
mast?

We use some CF rods on camera platforms in place of AL, lighter and more
bling factor.

Michael
On Aug 31, 2012 6:30 PM, "Corey Price" <coreyjprice at gmail.com> wrote:

> Yes, you're right about stronger steel being stronger but it still isn't
> stiffer.  The modulus of elasticity is a measure of the deflection rate of
> a material given a load.  The modulus of elasticity of most steels is
> around 28,500 ksi to 29,000 ksi, including chro-moly.  The 270 ksi
> high-strength prestressing steel strands I specify for some concrete
> structures have a modulus of 28,000 ksi which is less than 50 ksi mild
> steel!
>
> I know there are many engineers here so I won't go much further.  Stronger
> steel is just that- stronger.  It isn't stiffer.  Carbon fiber is used for
> weight savings since it can be woven with layups that promote stiffness or
> other properties.  For example, the Hubble telescope uses special carbon
> fiber struts that are specially woven so that they don't contract or
> elongate when temperatures swing wildly.
>
> I think the way to make the shift rods stiffer is to increase their
> diameter.
>
> Corey
>
>
> On Aug 31, 2012, at 3:54 PM, "michael at michaelshortt.com" <
> michaelsavga at gmail.com> wrote:
>
> > Isn't that backwards. Stronger steel doesn't bend as easily, when it does
> > break, it pops, whereas the soft stuff contorts, bends and just plain
> turns
> > into twisty playdoh when pushed two far.
> > At least as far as hardware/fasteners seem to function.
> >
> > Michael
> > On Aug 31, 2012 5:46 PM, "David" <fisher95020 at yahoo.com> wrote:
> >
> >> ...  Or the son in law panics and forces it.  :-)
> >>
> >> MikeLDrew at aol.com wrote:
> >>
> >>>
> >>> In a message dated 8/31/12 14 21 55, fisher95020 at yahoo.com writes:
> >>>
> >>>
> >>>> So I'm not the only one.  I let my son in law drive and when he got
> back
> >>>> we couldn't get reverse anymore and had to adjust again.   My view was
> >> the
> >>>> fore / aft adjustment is pretty robust,  but side to side is not so as
> >> the
> >>>> locking nut on the turnbuckle is the only thing keeping that in
> >> check.   I
> >>>> replaced the rubber bushing that holds the first long rod with a
> delrin
> >>>> bushing and liked the feel but still have trouble keeping it in
> >> adjustment.
> >>>>
> >>>
> >>>>>> Often the cause is that the support bearing comes loose from the
> >>> chassis, OR the trunnion mount on the chassis cracks and flexes, which
> >> does the
> >>> same thing.
> >>>
> >>> Mike
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