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Old 11-10-2008, 10:51 AM
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Question lb/ft to in/lb

I have a unit conversion issue at work: we have 5 pounds per foot, and we need to know how many inches are in one pound.

Any help would be greatly appreciated. I need a formula, because it looks like this is the first of many such conversions from lb/ft to in/lb.

Thanks,

James
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  #2  
Old 11-10-2008, 02:41 PM
JohnS JohnS is offline
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Default Re: lb/ft to in/lb

Quote:
Originally Posted by Unregistered
I have a unit conversion issue at work: we have 5 pounds per foot, and we need to know how many inches are in one pound.

Any help would be greatly appreciated. I need a formula, because it looks like this is the first of many such conversions from lb/ft to in/lb.

Thanks,

James
First, construct the reciprocal. If it is 5 lb/ft, then it is 1 ft/5 lb = 0.2 ft/lb. Then convert the foot to inches
0.2 ft/lb x 12 in/ft = 2.4 in/lb
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Old 05-05-2011, 08:50 PM
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Default Re: lb/ft to in/lb

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Originally Posted by Unregistered View Post
I have a unit conversion issue at work: we have 5 pounds per foot, and we need to know how many inches are in one pound.

Any help would be greatly appreciated. I need a formula, because it looks like this is the first of many such conversions from lb/ft to in/lb.

Thanks,

James
You are getting your unit values mixed up.

1- a pound is a unit of weight; an inch is a unit of distance; they are not the same and cannot be converted to each other. A pound will always equal 32 oz and a foot will always equal 12 inches. eg. (5 lb / 1 ft) = (5 lb / 12 in) = (0.4166 lb / 1 in)

2- a lb-ft not lb/ft is a unit value for torque. Picture a shaft with a 1ft or 12 inch arm affixed to it at say the 3:00 position. Hanging a 1 pound weight at the end of the arm creates a 1 lb-ft of torque on the shaft. (1 lb-ft = 12 lb-in).

2- ft-lb not ft/lb is a unit value for energy expended or work. Picture a 1 pound weight on a flat surface. Moving the weight 1 foot or 12 inches expends 1 ft-lb of energy or uses 1ft-lb of work to accomplish the task. (1 ft-lb) = 12 in-lb)
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Old 05-06-2011, 02:38 AM
JohnS JohnS is offline
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Default Re: lb/ft to in/lb

Quote:
Originally Posted by Unregistered View Post
You are getting your unit values mixed up.

1- a pound is a unit of weight; an inch is a unit of distance; they are not the same and cannot be converted to each other. A pound will always equal 32 oz and a foot will always equal 12 inches. eg. (5 lb / 1 ft) = (5 lb / 12 in) = (0.4166 lb / 1 in)

2- a lb-ft not lb/ft is a unit value for torque. Picture a shaft with a 1ft or 12 inch arm affixed to it at say the 3:00 position. Hanging a 1 pound weight at the end of the arm creates a 1 lb-ft of torque on the shaft. (1 lb-ft = 12 lb-in).

2- ft-lb not ft/lb is a unit value for energy expended or work. Picture a 1 pound weight on a flat surface. Moving the weight 1 foot or 12 inches expends 1 ft-lb of energy or uses 1ft-lb of work to accomplish the task. (1 ft-lb) = 12 in-lb)
A pound is 16 oz, actually. Your comments are correct about torque but lb/ft is a reasonable unit for spring rate of a spring; in/lb, besides the conversion of feet to inches, is a reciprocal spring rate.
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