Torque Wrench Usage and Torque Wrench History

TIMELINE:
0:00 History of Torque (tension) wrenches
1:48 Units of measurement
1:52 Lever length and force
2:00 1-foot x pound example
2:30 Older tools for measuring bearing rotational torque (tension)
2:50 Lever length example
3:45 Spring tension example
5:25 1939 tension wrench
6:30 Modern units of measurement
7:05 Inch x pound measurements
8:28 Modern (2017) torque wrenches
8:45 Flexible beam torque wrenches
9:27 holding a flexible beam torque wrench
10:15 Accuracy and precision
11:59 Electronic torque wrenches
13:10 Torque only verses torque-angle wrenches
14:00 Why I do not use clicker-style torque wrenches
14:25 Major flaws with early Snap-On electronic torque wrenches
16:25 How to prevent batteries from draining
16:45 Power button
16:54 Units button
17:26 Plus and Minus buttons
18:11 Later style (all steel) Snap-On electronic torque wrenches
18:58 Powering on the torque wrench
19:24 Angle Zeroing - Set Still
20:00 Additional units of measure
20:30 Powering off the torque wrench
20:45 How reaching the desired torque is indicated
21:10 How to avoid over-torquing
22:30 Accuracy and choosing the proper torque wrench
24:00 Proper care and storage
24:25 Precision spring scales
24:50 Dial style torque wrenches
25:21 Never exceed the maximum rating of a torque wrench
26:10 Three different dial style torque wrenches
27:12 Units of measure on the dial
27:33 Minimum/Maximum needle
29:00 Maximum scale/torque
29:50 Example of measuring rotating torque of a preloaded pinion bearing
30:20 Measuring an unknown bearing preload
31:00 Breakaway torque
33:30 Proper care and storage of torque wrenches

ABOUT US
Weber State University (WSU) - Department of Automotive Technology - Ardell Brown Technology Wing - Transmission Lab. This is part of a series of videos on Precision Measurements and tool care - Basic use and care of Hammers, Chisels, and Punches.

This video was created and edited by Professor John D. Kelly at WSU. For a full biography, see http://www.weber.edu/automotive/J_Kel...

QUESTIONS FOR TEACHERS:
1. How did mechanics from the 1960s and earlier, measure the rotational torque of axle bearings?
2. What two basic units of measure are involved in applying torque to a bolt, nut, etc.?
3. What does it mean to apply 10 foot-pounds of torque to something?
4. What does a spring scale have to do with applying torque to something?
5. What was the 1939 tool in the video called that was used to torque things?
6. What is the modern unit of measurement of torque that the majority of the world uses?
7. How is an inch-pound of torque different than a foot-pound of torque?
8. How should you hold the handle of a flexible beam torque wrench?
9. Under what condition(s) are most torque wrenches the most accurate?
10. What is the difference between the three small flexible beam torque wrenches shown in the video?
11. What is the difference between the red housing and the gray housing electronic torque wrenches shown in the video?
12. What does Torque-to-Yield mean?
13. Why are clicker-style torque wrenches not recommended by the professor for any type of work?
14. What is one major flaw in the red housing or gray housing Snap-on electronic torque wrenches?
15. What should you do to the end caps on the red housing or gray housing Snap-on electronic torque wrenches when you put them back in the professor's toolbox?
16. What is another major flaw in the red housing or gray housing Snap-on electronic torque wrenches?
17. Where should your hand be placed when using the red housing or gray housing Snap-on electronic torque wrenches to tighten something?
18. What can happen if you pull on the end cap of the red housing or gray housing Snap-on electronic torque wrenches?
19. When using any electronic torque wrench, how do you avoid over-torquing whatever you are torquing?
20. When torquing a lug nut to 100 foot-pounds, which torque wrench should you use? A 5-100 foot-pound range torque wrench or a 25-250 foot-pound range torque wrench?
21. Explain the reason for your answer to the previous question?
22. When putting away torque wrenches in the toolbox, what precautions should be taken?
23. What is the advantage of the dial-type torque wrenches?
24. What is the min-max needle used for?
25. How do you avoid damaging the internal components of a dial-type torque wrench?
26. Where should the dial-type torque wrenches be sat when not being used on your workbench?
27. How do you convert foot-pounds to inch-pounds?
28. How do you convert inch-pounds to foot-pounds?
29. How do you convert foot-pounds to Newton-meters?
30. How do you convert Newton-meters to foot-pounds?

DONATE TO OUR DEPARTMENT
Please consider a donation to the Department of Automotive Technology at Weber State University here: http://advancement.weber.edu/Automotive