Applied Product Catalog 2016 2017 Page i5 Technical Reference

Horsepower & Torque All Things Industrial SM i5 Horsepower Torque SPEED, in the science of bearing application and power transmission, is expressed in terms of the revolutions per minute (rpms) of a rotating object. VELOCITY is speed in a designated direction and is usually expressed in terms of feet per minute (fpm). FORCE is the element that produces a change in the velocity of an object. It is usually expressed in pounds. WORK occurs when a force moves an object through a distance. It is usually expressed in foot-pounds or inch-pounds. POWER is the rate of doing work. It is usually expressed in foot-pounds per minute (fppm). HORSEPOWER is the unit of power. It is the power required to lift 33,000 pounds one foot in one minute. Illustration of Horsepower 33,000# x 1 = 1 hp 33,000 1,000# x 33 = 1 hp 33,000 A POUND-FOOT is the moment created by a force of one pound applied to the end of a lever arm one foot long. Pound-feet indicate torque. Example: 25 hp at 150 rpm = 10,504 Pound-Inches Torque 25 hp at 1.50 rpm = 1,050,400 Pound-Inches Torque 2.5 hp at 1.50 rpm = 105,040 Pound-Inches Torque HORSEPOWER (hp) = pounds (#) x feet 33,000 x no. minutes hp = Force (lb-in) X fpm 33,000 hp = Torque (in lb-in) X rpm 63,025 hp = Torque (in lb-ft) X rpm 5,252 TORQUE is the turning moment or twisting effort in a shaft or an object that tends to cause rotation. It is the measure of rotational force and is expressed in foot-pounds. Torque = force in pounds x radius in inch or foot Torque (pound-inch) = 63,025 x hp rpm Torque (pound-foot) = 5,252 x hp rpm Horsepower = TORQUE (lb-in) x rpm 63,025 Horsepower = TORQUE (lb-ft) x rpm 5,252 To compute torque at any horsepower, multiply torque values above by horsepower required. Example: 10 hp @ 580 rpm, torque = 10 x 109, or 1,090 lb-ins 1/2 hp @ 100 rpm, torque = 1/2 x 630, or 315 lb-ins For intermediate speeds, approximate the torque from table, or apply standard torque formula above. HORSEPOWER TO TORQUE CONVERSION TABLE Torque lb-in @ 1 hp rpm LB-IN rpm LB-IN rpm LB-IN rpm LB-IN 3450 18 580 109 68 927 7.5 8,403 3000 21 520 121 56 1,125 6 10,504 2500 25 420 150 45 1,401 4.7 13,410 2000 32 350 180 37 1,703 4 15,756 1750 36 280 225 30 2,101 3.2 19,695 1430 44 230 274 25 2,521 2.7 23,343 1170 54 190 332 20 3,151 2.2 28,648 950 66 155 407 16.5 3,820 1.8 35,014 870 72 125 504 13.5 4,669 1.5 42,017 780 81 100 630 11 5,730 1.2 52,521 640 98 84 750 9 7,003 1 63,025

Previous PageNext Page