[DeTomaso] Cable Shifter

[Corey Price]

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
>> _______________________________________________
>> 
>> Detomaso Forum Managed by POCA
>> 
>> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
>> 
>> DeTomaso mailing list
>> DeTomaso at list.realbig.com
>> http://list.realbig.com/mailman/listinfo/detomaso
>> 
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> 
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso