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Topic: Torque wrench
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30/11/2011 at 9:59am
Location: Hampshire Outfit: Hymer Nova S
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Having been responsible for the calculation and laboratory testing of bolt torquing I can confidently say that the achieved tension results can vary wildly. Important factors affecting this are bolt/nut quality, steel/material spec, plating types and condition, whether pre tightened, virgin, or with even mirco corrosion and very critically if lubricated and with what lubricant.
In respect to our caravan and car wheel bolting where the innate quality and wide ranging in use conditions set the parameters that we are coping with I can also confidently say:
The variations in achieved tension, are of a level that is far wider than I would expect the precision of all but bargain basement torque wrenches to be. So I would suggest that if this is the job you have in mind for your torque wrench, then there is little to be gained spending a lot. Certainly use one don't simply guess it, the safe torque might be a lot lower than you think!
A big mistake to make is to lubricate these bolts where the quoted torque values are not specifically for lubricated assembly; this massively increases the achieved tension in what is a highly stressed item; very very unwise and ill informed.
If the wrench is also for use on high precision components then the quality needs to reflect this, but most of our DIY type usage is with dry, low spec, initially plated, multi use, non precision stuff.
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30/11/2011 at 2:41pm
Location: NE Scotland Outfit: Bailey Phoenix + CRV
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Lidl had them a few weeks ago and I bought one - does the job and under £20
I got the last one in my local 2 weeks ago - try phoning around local lidls there might be one somewhere.
Remember to slacken it off after each use
------------- playing at tinkies
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30/11/2011 at 2:49pm
Location: Argyll Scotland Outfit: 1997 Bailey Ranger 470 4
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There are two basic types of torque wrenches.
The spring type and the handle twist type.
The spring type is by far the cheapest but it does have the advantage of you being able to see how close you are getting to your proposed torque setting.
The twist handle type are the most popular, but unless you go for an expensive one, they can be difficult to tell the exact moment that you hit the torque setting.
I have both and use them on different jobs.
------------- Lobey.
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