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Engineering · Mechanical Engineering
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A pair of involute gears have base circle diameters of 60 and 120 mm. Calculate the pressure angle of this gear set if the centre distance is 120 mm. (b) (4 marks) Figure 6 shows an electric m spur gears having 16, 32, and 24 teeth. The gears have the diametral pitch P -8 and the pressure angle 20°, and the pitch diameter for the idler gear is 100 mm. The idler shaft is supported by (e) driving a machine by mean of three straight-tooth A and B KKKM3934 () For the direction of motor rotation shown, determine the radial load carried by (6 marks) cach bearing. (ii For the opposite direction of the original motor rotation, determine the loads (6 marks) carried by both bearings. i) Explain briefly why the answers in (ii) and (iii) are different. (3 marks) 1700-rpm motor T- 20 N.m 16T 1 25.4 mm 32T 2.0 24T To driven Figure 6 (T teeth, T-torque)

Mc 3 V 2 A 64 16T 32M 32 ry 2φ = tan-ı ơeq-Vo;+02-oo, +3r, (for 2-D state of stress) ; 4C-1 0.615 1 ksi-6.890 MPa; K,-1 + (K-1)g; Kw- 4C-4 C 8FD 0.5 Mc P 8FDN dG 8FD 4F 8F 32 8NC

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