Mechanical Engineering Answers

Fig shows a mechanism in which the hydraulic actuator O2A

is expanding at a constant rate of 10 cm / sec. Determine

the directions and magnitudes of angular velocity and

acceleration of link O4A.

A reciprocating roller follower has cycloidal motion and its stroke of 30 mm is completed in 90°of the cam rotation. The follower is offset against the direction of rotation by 6.25 mm and radius of the roller is 12.5 mm. determine the base circle radius which would limit the pressure angle to 30°

In a crank and slotted lever quick return motion mechanism, the ratio of maximum

velocity at return stroke to the maximum velocity at cutting stroke is 2. If 25cm is the

stroke length, find (a) slotted lever length, (b) the ratio of time of cutting to return

strokes, (c) If the crank rotates at 30rpm, what is the maximum cutting velocity per

sec.

A reciprocating roller follower has cycloidal motion and its

stroke of 30 mm is completed in 90°of the cam rotation.

The follower is offset against the direction of rotation by

6.25 mm and radius of the roller is 12.5 mm. determine the

base circle radius which would limit the pressure angle to

30°.

In the mechanism shown in fig., the crank O2A makes 300

r.p.m in the conte clock wise direction as shown. Find

(i) Angular velocity of link O1A. (ii) Velocity of slider at B.

. The bush of the small end of a connecting rod is shown in Figure. Calculate

(i) the maximum and minimum diameters of the bush and connecting rod; and

(ii) the maximum and minimum interference between them

 It is required to design a knuckle joint to connect two circular rods subjected to an axial tensile force of 50 kN. The rods are co-axial and a small amount of angular movement between their axes is permissible. Design the joint and specify the dimensions of its components. The material for two rods and pin is selected as plain carbon steel of Grade 30C8 (Syt= 400 N/mm2 ). The Factor of safety is 5.

A Manufacturer is interested in starting a business with five different models of tractors ranging from 7.5 KW to 75 KW capacities. Specify power capacities of models

Four bar chain is given with length of links as follow: Link 1 = 74mm, link 2 = 96 mm, link 3 = 60 mm, Link 4 = 70mm. Determine: a) Whether it belong to class 1 or class 2 category of mechanisms. b) Describe all possible inversions with explanations

Axes Q2 and Q4 are fixed. Q2A = 1 1/2 inches.,Q4B = 2 inches., Q2Q4=3 inches. AB is out of such a length that when the driving crank 2 is 30 degrees celsius above Q2Q4, the driven crank 4 is 60 degrees celsius below Q2Q4 as shown. Find the length of AB and the two extreme positions of the center line Q4B of crank 4.