<div dir="ltr">I found the original manual for my Sears Craftsman DigiTork torque wrench, circa 1981. Copy attached for those who might be able to use it, and apologies for wasting the bandwith of everyone else.<div><br></div><div>As we all know, there's no provision for user calibration, and they state it's not possible. They do note three things I'd forgotten over the years: </div><div>(1) that 25% of full scale is the minimum target for storage of the wrench. I usually go al the way to zero. </div><div>(2) the wrench should be allowed to recover for four hours or so if the wrench has been left tensioned for more than a few hours.</div><div>(3) the wrench should be recalibrated every 10,000 cycles in a production environment. At that rate, I have another hundred years or more before mine needs it.</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Aug 17, 2018 at 12:38 PM, Sujit Roy <span dir="ltr"><<a href="mailto:triumphstag@gmail.com" target="_blank">triumphstag@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">My Craftsman torque wrench fell apart. If I recall these things did fall under their life time warranty . I bought a new one.<div><br></div><div>I still have it .</div><div><br></div><div>One day I will get to it</div><div><br></div><div>Sujit</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Aug 17, 2018 at 8:24 AM, John Innis <span dir="ltr"><<a href="mailto:jdinnis@gmail.com" target="_blank">jdinnis@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">The only time I have ever needed to calibrate a wrench was because it broke. On my Craftsman that I bought in 1993 the adjustment nut came loose after about 20 years of service, so I reassembled it and re-calibrated. Since I had the set up there I also tested another Craftsman I had of the same vintage and a Snap-ON I bought in 2016. Both of the other two wrenches were within 5 ft-lbs. which I consider to be about as good as you are going to get with this style of wrench. When I was working on airplanes for a living the shop sent torque wrenches out for re-calibration every 12 months. I have no idea if the service that we used ever did any adjustment on them or not.<br></div><div class="gmail_extra"><br><div class="gmail_quote"><span class=""><span>On Thu, Aug 16, 2018 at 11:49 PM, <span dir="ltr"><<a href="mailto:glemon@neb.rr.com" target="_blank">glemon@neb.rr.com</a>></span> wrote:<br></span></span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=""><span>That is a great tutorial on how to calibrate a torque wrench,I have to confess that I have two or three and I have never bothered in many, many years of ownership. For those that have done it or had it done how far off are they usually?<br>
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