2007-02-06 00:34:37 · 6 answers · asked by raa 1 in Science & Mathematics ➔ Engineering
Hmmm. have found the specs for tightness in mechanic books, but never how much to loosen them! Always seems to take more to get them loose when they have been in a while though.
I know it sounds sarcastic, but it will take whatever it takes to get loose.
2007-02-06 00:38:58 · answer #1 · answered by ralphers 3 · 0⤊ 0⤋
There is no table for it but if not frozen, it will take 10% to 20% more torque to loosen it.
Q? is valid, first you should examine it to see if it is rested if it is, it is frozen now if possible you should use liquid wrench, or some rest dissolving oil, if you can find breaking torque for this bolt then you can set the wrench to below the that torque but no one makes a wrench that is calibrated in this direction but you can be care full and not use whole crank to loosen the bolt that way you cannot apply enough torque to break the head off.
Allen bolt provides the wretch with a box of the bold, if you use this wrench, it is made so it will give enough and you cannot break of the bolt head unless you use extension or defeat the safety of the wretch in some way.
2007-02-06 13:07:24 · answer #2 · answered by minootoo 7 · 0⤊ 0⤋
Theoretical calculation of loosening torque would be difficult, as it would depend upon a number of factors such as the condition of the bolt/nut, the load, the friction and so on. Theoretical values are likely to be off considerably because of this.
However, with a toque wrench, you can actually measure the loosening torque very easily. Tohnichi is a Japanese company well known for its torque wrenches.
2007-02-09 08:53:19 · answer #3 · answered by Bharat 4 · 0⤊ 0⤋
The torque needed would be based on the friction of the nut on the surface, if you know the force applied by the bolt, the sorface area of the nut and the materials in use then you might be able to calculate it.
Otherwise use a torque wrench.
2007-02-06 08:49:42 · answer #4 · answered by fleacircusdirector 3 · 0⤊ 0⤋
A little vague, but here goes...
Mechanically you can either
1) Look in the manual and see what it says.
2) Use a Torque wrench and see what it reads when it starts to loosen.
3) I suppose you could set up a strain gauge, with a force transducer calibrate it, and connect this on a wrench, then when you remove the bolt, record the highest reading.
2007-02-06 08:40:12 · answer #5 · answered by Dylan m 3 · 0⤊ 0⤋
Use a beam type torque wrench ( the kind with a guage) Instead of a click type. The guage should tell you how much torque it takes.
2007-02-06 08:40:21 · answer #6 · answered by Jacob M 1 · 0⤊ 0⤋