A gear drive consists of a 20-degree steel spur pinion with 18 teeth driving a 48-tooth cast iron. The pinion speed is 1200 rpm, face width 30 mm and module 4 mm and it delivers 5 kW power. The gears are to be made to number 6 AGMA quality standards and are to be accurately and rigidly mounted. Use Ca = Cs = Cr= 1, Cm = 1.3, Cp 174 (MPa)05. Circle the correct answer on the answer sheet:

The value of the AGMA compressive stress in MPa is: 

(a) 480.4 (b) 491 (c) 500 (d) 386 

The value of compressive stress in MPa using standard formula is: 

(a) 480.4 (b) 491 (c) 505 (d) 380.2 

The percentage error between the above two values given in 4 and 5 is: 

(a) 3.92% (b) 2.15 % (c) 1% (d) 1.5% 

Using the Lewis formula, the bending stress in MPa is: 

(a) 38 (b) 18.975 (c) 33.7 (d) 45.2

Answer rating: 100% (QA)

Ans Spur gear d20 Tp 18 Tg 48 m 4mmp 200... View the full answer