<div dir="ltr"><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:rgb(0,0,153)">Thanks, Randall. Perhaps I'll take my springs along with the <br>documentation you've sent, to my local sporing shop (they've <br>been in business for over a hundred years) and see if they <br>can make multiple sets for less than a single set. I'll let you <br>know what I find. Perhaps others are interested as well.<br><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:rgb(0,0,153)">Dave<br><br><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Mar 16, 2017 at 4:32 PM, Randall <span dir="ltr"><<a href="mailto:TR3driver@ca.rr.com" target="_blank">TR3driver@ca.rr.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt"><u></u> <u></u></span></font></p>
<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">> If I took my old ones to a spring -</span></font></p>
<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">> maker here in the <u></u>Portland<u></u> (<u></u><u></u>Maine<u></u><u></u>) area, what data
would I need to</span></font></p>
<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">> provide to them, along with my old springs? It's obviously possible
to</span></font></p>
<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">> make them look right but still be too stiff...<u></u><u></u></span></font></p>
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</span><p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">The drawing in the workshop manual should be enough. Page 203
here<u></u><u></u></span></font></p>
<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt"><a href="https://drive.google.com/open?id=0B2H2NJt34OffYWZiN2VlZGMtNTkxMi00NGUzLWE4NzMtMGRkODRkYzU3MDU1" target="_blank">https://drive.google.com/open?<wbr>id=<wbr>0B2H2NJt34OffYWZiN2VlZGMtNTkxM<wbr>i00NGUzLWE4NzMtMGRkODRkYzU3MDU<wbr>1</a><u></u><u></u></span></font></p>
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<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">The ones I got from TRF appeared to have two problems:<u></u><u></u></span></font></p>
<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">1) The leaves were not tapered in thickness as shown in the drawing.<u></u><u></u></span></font></p>
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<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">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.<u></u><u></u></span></font></p>
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<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">In case anyone is interested, here's a photo of my lashup to measure
spring rate.<u></u><u></u></span></font></p>
<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt"><a href="http://s258.photobucket.com/user/TR3driver/media/Tools/DSCF0008.jpg.html" target="_blank">http://s258.photobucket.com/<wbr>user/TR3driver/media/Tools/<wbr>DSCF0008.jpg.html</a><u></u><u></u></span></font></p>
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<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">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).<u></u><u></u></span></font></p>
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<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">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.<u></u><u></u></span></font></p>
<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt"><u></u> <u></u></span></font></p>
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<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">-- Randall <u></u><u></u></span></font></p>
<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">56 TR3 TS13571L daily driver<u></u><u></u></span></font></p>
<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">71 Stag LE1473 - awaiting engine rebuild<u></u><u></u></span></font></p>
<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt">71-2-3 Stag - awaiting gearbox rebuild<u></u><u></u></span></font></p>
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<p class="m_-5548964582315343795MsoPlainText"><font size="2" face="Courier New"><span style="font-size:10.0pt"> </span></font></p>
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