1.10 Figure 1.24 shows a special spanner used to tighten screwed components. A torque is applied at the tommy- bar and is transmitted to the pins which engage into holes located into the end of a screwed component. (a) Using the data given in Fig. 1.24 calculate: (i) the diameter D of the shank if the shear stress is not to exceed 50 N/mm², (ii) the stress due to bending in the tommy-bar, (iii) the shear stress in the pins. (b) Why is the tommy-bar a preferred method of applying the torque? [C.G.] [9.14 mm; 254.6 MN/m²; 39.8 MN/m².] 50N force applied oto ostonce of 25 mm from both ends of tommy bar Fig. 1.24. 25 t- 25 8

1.10 Figure 1.24 shows a special spanner used to tighten screwed components. A torque is applied at the tommy- bar and is transmitted to the pins which engage into holes located into the end of a screwed component. (a) Using the data given in Fig. 1.24 calculate: (i) the diameter D of the shank if the shear stress is not to exceed 50 N/mm², (ii) the stress due to bending in the tommy-bar, (iii) the shear stress in the pins. (b) Why is the tommy-bar a preferred method of applying the torque? [C.G.] [9.14 mm; 254.6 MN/m²; 39.8 MN/m².] 50N force applied oto ostonce of 25 mm from both ends of tommy bar Fig. 1.24. 25 t- 25 8

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Question

1.10 Figure 1.24 shows a special spanner used to tighten screwed components. A torque is applied at the tommy-
bar and is transmitted to the pins which engage into holes located into the end of a screwed component.
(a) Using the data given in Fig. 1.24 calculate:
(i) the diameter D of the shank if the shear stress is not to exceed 50 N/mm²,
(ii) the stress due to bending in the tommy-bar.
(iii) the shear stress in the pins.
(b) Why is the tommy-bar a preferred method of applying the torque?
[C.G.] [9.14 mm; 254.6 MN/m²; 39.8 MN/m²]
50N force applied of a ostonce
of 25 mm from both ends of
tommy bar
040
Fig. 1.24.
92

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