An example of the measurement of this

formula is shown in figure 2-12. When the exten-

sion is pointed back toward the handle of the

torque wrench, subtract the effective length of the

extension from the effective length of the torque

wrench. If the extension is pointed at a right angle

to the torque wrench, then the actual value does

not change.

An engineering study revealed a widespread

lack of understanding as to what happens when

an adapter is used with a torque wrench, To see

if you understand the effects of adapters and

extension handles, read the situation below and

answer the questions.

Situation: Given a dial-indicating torque

wrench, an adapter, and an extension handle,

perform the following steps:

taken. If this is not done, the torque obtained will

be in error.

Torque a nut to a predetermined indicated

value, gripping the torque wrench at the end of

the extension handle. Return to this torque value

a person repairing and building up engines

twice to ensure the nut is fully seated.

thoroughly understand the use, and care of the

m i c r o m e t e r . Micrometers are used to set

clearances and to measure damage or repair limits.

Remove the extension handle and apply the

Figure 2-13 shows an outside micrometer caliper

same indicated torque again.

w i t h the various parts clearly indicated.

Micrometers are used to measure distances to the

Question: Will the nut rotate before the

nearest one thousandth of an inch, The measure-

previously indicated torque is reached?

ment is usually expressed or written as a decimal.

You must know the method of writing and

Answer: Yes! Think it through--if you

reading decimals.

decrease the handle length (L), you increase the

torque (T) if the indicated torque (S) remains

of micrometers that are most commonly used

constant.

throughout the Navy. They are the outside

micrometer caliper (including the screw thread

Question: What would happen if a micrometer

micrometer), the inside micrometer, and the depth

torque wrench was used?

Answer: Nothing would change. The type of

torque wrench has no effect at all. It is simply a

function of the length of the lever arm between

the torque wrench square drive and where the

hands are placed on the handle.

Using solid-handle torque wrenches with

extension handles can cause significant over- or

undertorquing. This problem exists based on the

handle length chosen for the computation and

where hand force is actually applied on the

handle. When applying the formula, force must

be applied to the handle of the torque wrench at

the point from which the measurements were