[TR] TR3 Leaf Springs?

[David Friedlander]

Thanks, Randall. Perhaps I'll take my springs along with the
documentation you've sent, to my local sporing shop (they've
been in business for over a hundred years) and see if they
can make multiple sets for less than a single set. I'll let you
know what I find. Perhaps others are interested as well.

Dave



On Thu, Mar 16, 2017 at 4:32 PM, Randall <TR3driver at ca.rr.com> wrote:

>
>
> > If I took my old ones to a spring -
>
> > maker here in the Portland (Maine) area, what data would I need to
>
> > provide to them, along with my old springs? It's obviously possible to
>
> > make them look right but still be too stiff...
>
>
>
> The drawing in the workshop manual should be enough.  Page 203 here
>
> https://drive.google.com/open?id=0B2H2NJt34OffYWZiN2VlZGMtNTkxM
> i00NGUzLWE4NzMtMGRkODRkYzU3MDU1
>
>
>
> The ones I got from TRF appeared to have two problems:
>
> 1) The leaves were not tapered in thickness as shown in the drawing.
>
>
>
> 2) (More importantly, I think) The leaves were just a bit thicker than
> given in the drawing.  Not by much, but apparently it doesn't take much.  I
> found an on-line site that would calculate leaf spring stiffness (sorry,
> I've lost the link).  When I put in the measured thickness of the new
> spring leaves (along with all the other data), it came up with a spring
> rate very similar to what I had measured.  When I put in the numbers from
> the workshop manual, the result was much closer to the rate in the manual.
>
>
>
> In case anyone is interested, here's a photo of my lashup to measure
> spring rate.
>
> http://s258.photobucket.com/user/TR3driver/media/Tools/DSCF0008.jpg.html
>
>
>
> Two needle valves (one is hidden in the photo) allow adjusting the amount
> of air in the cylinder.  The resulting force can be calculated from the air
> pressure displayed (times the area of the cylinder piston), and the
> deflection measured with a ruler (not shown).  Cost for the whole
> contraption was only about $50 (the used air cylinder was $25 with shipping
> from ebay).
>
>
>
> As it happened, I got given a pair of original springs, so I kind of lost
> interest in the quest for new ones.  Unfortunately, they seem to be sagging
> pretty badly, so I need to be working on this topic again soon.
>
>
>
>
>
> -- Randall
>
> 56 TR3 TS13571L daily driver
>
> 71 Stag LE1473 - awaiting engine rebuild
>
> 71-2-3 Stag - awaiting gearbox rebuild
>
>
>
>
>
>
>
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