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.
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:
(1) that 25% of full scale is the minimum target for storage of the
wrench. I usually go al the way to zero.
(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.
(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.
On Fri, Aug 17, 2018 at 12:38 PM, Sujit Roy <triumphstag at gmail.com> wrote:
> My Craftsman torque wrench fell apart. If I recall these things did fall
> under their life time warranty . I bought a new one.
>
> I still have it .
>
> One day I will get to it
>
> Sujit
>
> On Fri, Aug 17, 2018 at 8:24 AM, John Innis <jdinnis at gmail.com> wrote:
>
>> 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.
>>
>> On Thu, Aug 16, 2018 at 11:49 PM, <glemon at neb.rr.com> wrote:
>>
>>> 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?
>>>
>>> Greg Lemon
>>> TR250
>>>
>>>
>>> ** triumphs at autox.team.net **
>>>
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>>>
>>
>>
>>
>> --
>> =================================
>> = Never offend people with style when you =
>> = can offend with substance --- Sam Brown =
>> =================================
>>
>>
>> ** triumphs at autox.team.net **
>>
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>>
>>
>
>
> --
> Sujit Roy
> Cupertino, California
>
> https://triumphstagblog.wordpress.com/
>
>
>
> ** triumphs at autox.team.net **
>
> Donate: http://www.team.net/donate.html
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>
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