# Examples of kinematic pairs - Theory of Machines - 1

Q.  Match the following Group 1 items (Kinematic pairs) with Group 2 items (Examples) and select the correct option

1. Revolute pair ----------------------------------------------- A. Ball bearing
2. Helical pair ------------------------------------------------- B. Ball and socket
3. Rolling pair ------------------------------------------------- C. Lathe spindle in the head stock
4. Globular pair ----------------------------------------------- D. Motion between bolt and fixed nut

- Published on 06 Aug 15

a. 1 – D, 2 – A, 3 – C, 4 – B
b. 1 – B, 2 – D, 3 – A, 4 – C
c. 1 – C, 2 – D, 3 – A, 4 – B
d. 1 – A, 2 – C, 3 – D, 4 – B

ANSWER: 1 – C, 2 – D, 3 – A, 4 – B

#### Discussion

• Sravanthi   -Posted on 19 Oct 15
- Lathe spindle supported in the head stock or wheel turning over the axle is an example of turning or revolute pair. If two links are connected in such a way that one link is constrained to turn with respect to other link, then they form a revolute pair.

- Motion between bolt and the fixed nut is an example of helical or screw pair. A screw pair is formed if one link turns about the other link by screw threads. Thus screw pairs have both rotational and sliding motion.

- A ball with its bearing forms a rolling pair. When one link rolls over the other link then it is said to form a rolling pair.

- A ball and socket is an example of spherical or globular pair. A spherical pair is a kinematic pair formed when one link forms a spherical shape and turns inside a fixed element.

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