How to set a torque wrench in inch pounds - Quora- how do you set a torque wrench to 7 ft pounds ,You will need to get a torque wrench which reads a smaller foot lbs torque figure then convert it into Inch pounds,for example, you need to divide the inch lb figure by 12 to get the foot lbs figure. I use a torque beam indicator to read such a small figure,for example, I have a small one which goes up to 7 Newton metres (5.1629 foot lbs) which is 61.955 inch lbs & I use it to check bearing preload,etc !Torque Wrench Tool Calculation | Physics Forums28/9/2010· You are putting 100 ft-lbs of force on a 2 ft extender bar. Shouldn't it be only 2 feet in your calculation instead of 3? The 100 ft-lbs doesn't mean that you simply have 1 ft in length already to start with. Since the torque wrench is 2 feet long (W), 50 pounds of force must be applied at the center of the torque wrench handle to produce the torque wrench setting of 100 ft-lbs.