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Old 05-30-2021, 09:15 PM #31
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Originally Posted by texadelphia View Post
The way I figure, I weigh 150 lbs and I was pulling down on the torque wrench so if it's about a foot long the most I could put into it would be 150 ft-lbs before I was doing pull ups on the torque wrench. Lol. But it might be a little longer than a foot. Still seems like there should be a bigger factor of safety on the hardware.

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Just so nobody makes the mistake of assuming their mass (weight) is small enough to hang on a torque wrench - the lbs in ft-lbs is pounds - force. You need to multiply your mass (150 lbs) by the acceleration of gravity to get the true force. I believe gravity is ~32 ft / sec^2. Thus, a 1 ft long torque wrench with you hanging off it would be 4,800 ft-lbs of torque.
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Old 05-31-2021, 11:02 AM #32
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Originally Posted by TX4Running View Post
Just so nobody makes the mistake of assuming their mass (weight) is small enough to hang on a torque wrench - the lbs in ft-lbs is pounds - force. You need to multiply your mass (150 lbs) by the acceleration of gravity to get the true force. I believe gravity is ~32 ft / sec^2. Thus, a 1 ft long torque wrench with you hanging off it would be 4,800 ft-lbs of torque.
That's actually not at all correct. Acceleration due to gravity is already accounted for in scale readings so weight measurements are are actually in lbs-force. Read this.

mechanical engineering - Pound-force (lbf) vs Pound-mass (lbm) - Engineering Stack Exchange
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Old 05-31-2021, 11:30 AM #33
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Originally Posted by texadelphia View Post
That's actually not at all correct. Acceleration due to gravity is already accounted for in scale readings so weight measurements are are actually in lbs-force. Read this.

mechanical engineering - Pound-force (lbf) vs Pound-mass (lbm) - Engineering Stack Exchange
10-4. I stand corrected. It's been over 20 years since I took mechanics in college.
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Old 05-31-2021, 02:45 PM #34
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10-4. I stand corrected. It's been over 20 years since I took mechanics in college.
Same. It's another confusing quirk of the English unit system. I do a lot of FEA work dealing with acceleration and body forces so this stuff hasn't gone stale with me yet.

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