1. Government Tool Room & Training Centre, Chikodi
Diploma in Tool and Die Making
“Jigs and Fixture”
4th semester
1
GTTC,CHIKODI SANTOSH MALIPATIL
Unit-03 Clamping

2. 2
Clamping Elements:
The forces exerted by the clamps hold a part securely in the fixture against
all other external forces.
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3. 3
Clamping Elements:
The forces exerted by the clamps hold a part securely in the fixture against
all other external forces.
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4. 4
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5. 5
1. Clamping device holds workpiece in jigs and fixture against the forces.
2. Proper clamping is necessary to get good productive cycle
3. It should be rigid to hold work piece
4. Work piece should not be damaged due to more force
5. Clamping force depends on type of material used
Example- In case of Mild steel, case hardened, Cast Iron, Aluminium
clamping force are different
6. Clamping is used when more vibration occurs during drilling
7. Clamping and releasing should be easy which saves labour cost
Basic requirement of Clamping
8. Clamping force should be directed towards the supporting points
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6. 6
What the difference between locators & clamps?
 Locators: Locators provide a positive stop for the work piece. Placed against
the stop, the work piece cannot move.
 Clamps: on the other hand, rely only upon friction between the clamp and
the clamped surface to hold the work piece. Sufficient force could move the
work piece.
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7. 7
Types of Clamping
1. Cam clamp
2. Screw clamp
3. Hook clamp
4. Strap clamp
5. Latch Clamp
6. Wedge clamp
7. Swinging Strap (Latch Clamp)
8. Hydraulic clamp(Power clamping)
9. Pneumatic clamp(Power clamping)
10.‘C’ Clamp
11.Toggle clamp
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8. GTTC,CHIKODI SANTOSH MALIPATIL 8

9. 9
• It is used for unloading and loading of workpiece is done easily
• Its not used when vibration in machine while drilling is more
1. Cam Clamp
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• Light weight workpiece is used
• Time will take more for fitting and unfitting
• Force on workpiece is less
2. Screw clamp
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• This is very simple clamping device and is only suitable for light work
• It is used where screw clamping is not possible.
3. Hook Clamp
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Lever clamp
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13. 13
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To unload the work piece, the locking nut is unscrewed by giving it about
one turn and this releases the c- clamp. When the clamp is removed or
swing away the work piece can freely pass over the nut.
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15. 15
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Hydraulic Clamping
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Pneumatic Clamping
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