Mechanical Formulas

Need to Find Formula
Circumference of a Circle 3.1416 x Diameter
Arc Length 0.017453 x Radius x Angle
Velocity (feet per minute) FPM=0.262 x Diameter x rpm
Torque (inch pounds) T=(HP x 63025)/rpm
Torque (inch pounds) T= Force (lbs) x Radius (in)
Horsepower HP= (T (in-lbs) x RPM)/63025
Horsepower HP=(Force x FPM)/33000
Belt or Chain Pull (HP*126000)/(RPM x Diameter inches)