Assembly Manual

[Feltman]

Received my Assembly Manual yesterday..money well spent. Question are the torque values that are list as newton something or another related to regular torque values..IE in-lbs or ft-pds?:cool

 

[Tom Bryant]

Here

This explains it all. :crazy

newton meter (N·m)
the SI unit of torque. Torque, the tendency of a force to cause a rotation, is the product of the force and the distance from the center of rotation to the point where the force is applied. Torque has the same units as work or energy, but it is a different physical concept. To stress the difference, scientists measure torque in newton meters rather than in joules, the SI unit of work. One newton meter is approximately 0.737 562 pound foot.

I'll bet somebody makes torque wrenches graduated in newton meters. Or you could just grab the calculator and convert it. Looks like you would multiply the torque value given in newton meters by .74 or 74% to get lb/ft.

But waite! Isn't lb/ft torque as relating to work as in the torque rating of an engine? Torque for tightening fasteners is ft/lbs, right? Or is it the other way around? My torque wrenches say foot pounds.

foot pound (ft·lbf or ft·lb)
a traditional unit of work, equal to the work done by a force of one pound acting through a distance of one foot. This is equivalent to approximately 1.355 818 joule, 1.285 07 x 10-3 Btu, or 0.323 832 (small) calorie.

So what is a joule?

joule (J)
the SI unit of work or energy, defined to be the work done by a force of one newton acting to move an object through a distance of one meter in the direction in which the force is applied. Equivalently, since kinetic energy is one half the mass times the square of the velocity, one joule is the kinetic energy of a mass of two kilograms moving at a velocity of 1 m/sec. This is the same as 107 ergs in the CGS system, or approximately 0.737 562 foot-pound in the traditional English system. In other energy units, one joule equals about 9.478 170 x 10-4 Btu, 0.238 846 (small) calories, or 2.777 778 x 10-4 watt hour. The joule is named for the British physicist James Prescott Joule (1818-1889), who demonstrated the equivalence of mechanical and thermal energy in a famous experiment in 1843. Although Joule pronounced his name "jowl", the unit is usually pronounced "jew'l".

So it looks like a joule and a newton are basically the same measurement but used in different types of calculations: 1=0.737 562 ft/lb or lb/ft as it's discribed both ways in the above paragraphs, using the same decimal equivilent.

Maybe this will help, or not.

pound foot (lbf ft or lb ft)
a traditional unit of torque. Torque is the tendency of a force to cause a rotation; it is the product of the force and the distance from the center of rotation to the point where the force is applied. Thus it can be measured in pounds of force times feet of distance. One pound foot is equal to approximately 1.355 818 newton meter (N·m) in SI units. Algebraically, torque has the same units as work or energy, but it is a different physical concept. To stress the difference, scientists and engineers traditionally measure torque in pound feet (or newton meters) and work or energy in foot pounds (or joules).

I think the answer is get a service manual that lists torque values in lbs and inches. Whew.

Tom