70-23-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B. Extensions for a Torque Wrench (Fig. 201)
S 912-028-N00
(1) When you use an extension on a torque wrench, the effect of length changes.
(a)
You must calculate the torque indication that will give you the necessary torque on the part.
(b)
Use the formula that is shown in Figure 201 to get the indication of torque by the torque wrench.
TASK 70-23-00-912-029-N00
3. General Instruction For Torque
______________________________
A. Consumable Materials
(1)
Engine Oil (PWA 521)
(2)
Anti-Galling Compound (PWA 586-3)
(3)
Lubricant (High Temperature)
B.
References
(1)
70-24-01/201, Assembly of Flexible Type Fittings
(2)
74-21-02/401, Igniter Plug
C.
Torque for parts that you lubricate
NOTE: Torque values in this section apply, when you lubricate the
____ part with the engine oil or the antiseize compound. You must lubricate one or two of the surfaces, that will rub together, when you apply the torque. Do not use the engine oil and antiseize compound on the same pair of surfaces.
S 912-030-N00
(1)
Torque limits apply to the parts, that you lubricate with oil, when you use the engine oil or the equivalent.
S 912-031-N00
(2)
Torque limits apply to the parts, that you lubricate with the antiseize compound, when you use the wet antiseize compound or the wet high temperature lubricant.
D.
Torque limits for nuts, bolts and screws (Fig. 202)
S 912-032-N00
(1) Standard nuts, bolts, and screws
(a)
Torque limits in the Figure 202 for the nuts, bolts, and screws give a sufficient load without damage to the parts.
(b)
The limits are for the materials that have a minimum strength in tension of 125,000 pounds for each square inch (861844.6 kilo-Pascals).
(c)
This is the equivalent to the Rockwell C26-hardness for steel parts.
NOTE: The torque limits apply to bolts in heli-coils if
____
the threads engage fully.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A CALCULATION OF THE INDICATED TORQUE IS NECESSARY WHEN AN EXTENSION IS USED, WHICH CHANGES THE EFFECT OF LENGTH OF A TORQUE WRENCH. USE THE FORMULA THAT FOLLOWS TO GET THE INDICATED TORQUE.
L x T
R =
L + E
A CALCULATION OF THE INDICATED TORQUE IS NECESSARY WHEN AN EXTENSION IS USED, WHICH CHANGES THE EFFECT OF LENGTH OF A TORQUE WRENCH. USE THE FORMULA THAT FOLLOWS TO GET THE INDICATED TORQUE.
L x T
R =
L - E
BEACON (ULB)
SEE
NO CORRECTION OF THE INDICATION OF TORQUE IS NECESSARY WHEN AN EXTENSION IS USED WHICH DOES NOT CHANGE THE EFFECT OF LENGTH OF THE TORQUE WRENCH.
LEGEND
T = NECESSARY TORQUE E = LENGTH OF THE EXTENSION THAT HAS AN EFFECT L = LENGTH OF THE TORQUE WRENCH R = INDICATION OF TORQUE ON THE WRENCH
NOTES:DO NOT USE AN EXTENSION ON THE HANDLE OF THE TORQUE WRENCH.
THE LENGTH THAT CAN HAVE AN EFFECT IS STAMPED ON THE PWA EXTENSIONS, ADAPTERS, AND WRENCHES.
L-47816
EXAMPLE: A TORQUE OF 1440 POUND-INCHES (162.698 NEWTON METERS) IS NECESSARY ON A PART. YOU USE AN EXTENSION THAT HAS A LENGTH OF 3 INCHES (76.2 MILLIMETERS) FROM CENTER TO CENTER OF ITS HOLES. YOU USE A TORQUE WRENCH THAT HAS A LENGTH OF 15 INCHES (381 MILLIMETERS) FROM THE CENTER OF THE HANDLE OR THE SWIVEL PIN OF THE HANDLE TO THE CENTER OF ITS SQUARE ADAPTER.
L x T 15 x 1440
THEN: R =
= = 1200 POUND-INCHES
L + E 15 + 3
L x T 381 x 162.698
R =
= = 135.582 NEWTON METERS
L + E 381 + 76.2
WITH THE AXIS OF THE EXTENSION OR ADAPTER AND THE TORQUE WRENCH IN A STRAIGHT LINE, TIGHTEN TO AN INDICATION OF TORQUE OF 1200 POUND-INCHES (135.582 NEWTON METERS) TO SUPPLY THE NECESSARY TORQUE OF 1440 POUND-INCHES (162.698 NEWTON METERS) ON THE PART.
Calculate the Effect of an Extension for a Torque Wrench
Figure 201
K28947
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