Adrian Saunders Posted June 18, 2020 Report Share Posted June 18, 2020 Would anyone be able to tell me how to correct a torque wrench setting when using a crow’s foot spanner on one? Link to comment Share on other sites More sharing options...
KevinR Posted June 18, 2020 Report Share Posted June 18, 2020 It depends on which direction the crows foot is pointing. If it’s at 90 or 270 degrees to the shaft then it makes virtually no difference to the breaking torque, but if it’s at zero degrees (Out the front of the wrench) it increases the breaking torque and at 180 degrees it decreases the torque. In a test just now with my torque calibrator, a crows foot that has 20mm between centres increased the torque by 5% at 0 degrees and decreased it by 5% at 180 degrees. Of course, when one has a torque calibrator available It’s an academic question as one sets the breaking torque with the crows foot fitted 😀 The following formula has been used: M1 = M2 x L1 / L2 Where: M1 is the torque setting of the wrench M2 is the actual torque applied to the nut L1 is the normal length of the wrench L2 is the extended length of the wrench Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 18, 2020 Report Share Posted June 18, 2020 most dont change the length of leverage by much to worry about if the drive is close to the foot but buy as example 100 ft lbs is 100lb at a length of 1 ft turn it into inch lbs by X 12 and divide the sum by the length say 14" = 85 on the wrench or thereabouts Pete Link to comment Share on other sites More sharing options...
ahebron Posted June 26, 2020 Report Share Posted June 26, 2020 On 19/06/2020 at 07:53, KevinR said: KevinR why is the length of the torque wrench taken from middle of the handgrip. But I think I have just answered my own question with because it is where you push/pull on the torque wrench. Adrian Link to comment Share on other sites More sharing options...
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