[TR] TR3 Leaf Springs?

[David Friedlander]

Randall;

Perhaps this question has come up before but, in looking at the
spring diagram on page 203 of the manual, what do the "red"
and "blue" camber laden designations in the  legend section
of the drawing mean?

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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