+1 vote
in Machine Kinematics by (38.0k points)
The number of degrees of freedom of a planar linkage with 8 links and 9 simple revolute joints is

(a) 1

(b) 2

(c) 3

(d) 4

This question was addressed to me at a job interview.

This intriguing question comes from Velocity of a point Link on a Link By Instanteneous Centre Method in portion Velocity in Mechanisms of Machine Kinematics

1 Answer

0 votes
by (106k points)
The correct choice is (c) 3

Easiest explanation: Given l= 8, j= 9

We know that, Degree of freedom,

n =3(l − 1)−2j = 3(8 − 1)−2 x 9 = 3.

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