THEORY OF MACHINE AND MECHANISM || PROBLEM 2 || INVOLUTE SPUR GEAR ||

Problem 2: Two gears wheels mesh externally and are to give a velocity ratio of 3 to 1. The teeth are of involute form; module = 6 mm, addendum = one module, pressure angle = 200. The pinion rotates at 90 rpm. Determine: 1. The number of teeth on pinion to avoid interference on it and the corresponding number of teeth on the wheel, 2. The length of path and arc of contact, 3. The number of pair of teeth in contact, and 4. The maximum velocity of sliding.
PROBLEM 3

[aygunagayeva]

The figure shows a double-reduction helical gearset. Pinion 2 is the driver, and it
receives a torque of 2120 lbf. in from its shaft in the direction shown. Pinion 2 has
a normal diametral pitch of 8 teeth/in, 14 teeth, and a normal pressure angle of 20
and is cut right-handed with a helix angle of 30°. The mating gear 3 on shaft b
has 36 teeth. Gear 4, which is the driver for the second pair of gears in the train,
has a normal diametral pitch of 5 teeth/in, 15 teeth, and a normal pressure angle of
20° and is cut left-handed with a helix angle of 15°. Mating gear 5 has 54 teeth.
Find the magnitude and direction of the force exerted by all of the bearings on
shaft a, b and the c, if bearings B, C and E can take only a radial load while
bearings A, D and F are mounted to take both radial and thrust loads. The life goal
is 25 kh, with a reliability factor for the ensemble of all four bearings to equal or
exceed 96%. The Weibull parameters are x0= 0.02, (θ- x0)=4.439, and b= 1.483.
The efficiency of the system is 90%.
(a) Select the roller bearing for location B and C and ball bearing for E.
(b) Select the ball bearing (angular contact) for location A and D assuming the
inner ring rotates and for F assuming the outer ring rotates.

***Can you help me to solve this problem?***

[yashbagale]

This is wrong solution l, In Ap addendum should be in fractional number not in mm

[yogeshpareek]

Questions no. 2 me 18.2 value kese aa rhi h please solve