1. KINEMATIC PAIRS Prepared by B.BALAMURALI AP/MECH
SNS COLLEGE OF ENGINEERING, COIMBATORE   DEPARTMENT OF MECHANICAL ENGINEERING  
KINEMATIC PAIRS Prepared by B.BALAMURALI AP/MECH
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2. RECAP MECHANISM - A device to transmit and modify motion.
MACHINE - A machine is a device which transmits both motion and forces.
KINEMATIC LINK
CONSTRAINED MOTIONS
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3. KINEMATIC PAIR
It is a joint of two links that permits relative motion.
When any two links are connected in such away that their relative motion is completely or successfully constrained, they form a kinematic pair.
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4. CLASSIFICATION OF KINEMATIC PAIRS
DEPENDING UPON THE NATURE OF RELATIVE MOTION BETWEEN THE LINKS
DEPENDING UPON THE NATURE OF CONTACT BETWEEEN THE LINKS
DEPENDING UPON THE NATURE OF MECHANICAL ARRAGEMENT BETWEEN THE LINKS
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5. DEPENDING UPON THE NATURE OF RELATIVE MOTION BETWEEN THE LINKS
(1)Sliding / Prismatic Pair
(2) Turning / Revolute Pair
(3) Screw / Helical Pair
(4) Cylindrical Pair
(5) Spherical / Globular Pair
(6) Rolling Pair
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6. SLIDING OR PRISMATIC PAIR(P)
When two links have a sliding motion relative to each other it is known as sliding or prismatic pair.
Example : Piston and cylinder
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7. TURNING OR REVOLUTE PAIR(R)
When two elements are connected such that one element revolves around the other, it forms a turning pair.
Example : Lathe spindle support
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8. SCREW OR HELICAL PAIR(S)
In a screw pair, one link is constrained to have a combination of turning and sliding motion relative to the other link.
Example : Nut & Bolt
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9. CYLINDRICAL PAIR(C)
In a cylindrical pair, one link is constrained to have a combination of translation and rotation motion relative to the other link.
Example : Circular shaft
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10. SPHERICAL OR GLOBULAR PAIR(G)
In a spherical pair, one link is constrained to swivel in or abut the other fixed point.
Example : Attachment of a car mirror.
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11. ROLLING PAIR(G)
When one link is free to roll over the other, it forms a rolling pair.
Example : Ball & Roller bearing & A road roller rolling over the ground.
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12. ACTIVITY!!!
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13. 1#
Two batsman each on 94 runs ,seven runs needed to win in last 3 balls. Both make 100*.How? ANS : 1st Batsman hits a six and gone retired hurt while the new batsman comes to play and get run out for his wicket. And the other batsman hit six and make both century and team win.
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14. 2# I’m a five letter word .If you remove one ,only two letters remain.
WHO AM I ?
ANS : Phone \ Stone
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15. DEPENDING UPON THE NATURE OF CONTACT BETWEEN THE LINKS
(1)LOWER PAIR - If a kinematic pair in motion has a surface or area contact between the two links it is called a lower pair. Ex : Nut & Bolt.
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16. HIGHER PAIR
If a kinematic pair in motion has a line or point contact between the two links it is called a higher pair. Ex : Cam & Follower.
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17. DEPENDING UPON THE NATURE OF MECHANICAL ARRANGEMENTS BETWEEN THE LINKS
(1)CLOSED PAIR - When two links of a pair are held together mechanically, they constitute a closed pair. Ex : All lower pairs are self closed pairs.
(2) UNCLOSED PAIR - When two links of a pair are not held together mechanically, they constitute a closed pair. Ex : Cam & Follower.
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18. Application of this types of pair
WORKTIME
Parts
Name the types of pair
Application of this types of pair
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19. HOME ASSIGNMENT
Write down different applications of kinematic pairs with diagram
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20. ME KOM / TOPIC-2