power hacksaw machine fabricated by using motors,flywheels,belts,and bearings.

1. AUTOMATIC HACKSAW MACHINE
SUBMITTED BY:-
Nirban Shakti Singh
Nandre Srujan Kumar
Bodala Raja sekhar SUBMITTED TO:-
Himavant Akhil Sai Prof. M.S.CHAROO
Votti Sayam Sai NIT SRINAGAR

2. CONTENT
 Introduction
 Working Principle
 Power Transmission
 List of Components
 Mechanical Analysis
 Cost Estimation
 Advantage
 Disadvantage
 Conclusion

3. Introduction
 The machine can solve the problem of time consumption.
 Waste of resources in face of labour cost is reduced.
 The machine can be used in the industry where it is manufactured, at the
packaging sector.
 And it is used as hardware in large quantity like in fabrication of machine.
 It provide alternative for industries aiming toward reducing human effort.
 It generates sustainable and practical automation solutions for the future
industrial development.

4. Working Principle
 The Slider–Crank mechanism is used to transform rotational motion into
translational motion by means of a rotating driving beam, a connection rod
and sliding body.

5. POWER TRANSMISSION
[V Belt]
 The belts are used to transmit power from one shaft to another by means of
pulleys which rotates at same or at different speeds.
 The amount of power transmitted depends on the following factors:
a) The velocity of the belt.
b) The tension under which the belt is placed on pulleys.
c) The arc of contact between belt and smaller pulley.
d) The conditions under which the belt is used.

6.  V- belts provide best combination of traction, speed of movement ,load of
bearings, long service life.
 V-belt may be homogenously rubber or polymer throughout or these may be
fibres embedded in the rubber or polymer for strength and reinforcement.

7. List of Components
DRIVING FORCE - AC MOTORS
 An AC motor is an electric motor driven by an alternating current.
 The reciprocating motion of the hacksaw blade, because of which the
cutting process takes place is produced with the help of an AC motor which
operates by a simple crank mechanism to convert the rotary motion of crank
into reciprocating motion hacksaw blade.
 The torque of AC motor must be increased
so as to bring about necessary power for
cutting work pieces efficiently.

8. COLLAR CLAMP BALL BEARING
 Ball bearing used to reduce rotational friction and support radial and axial
loads.
 It achieves this by using at least two races contain the balls and transmits
load through the balls.
 In most applications, one race is stationary and the other is attached to the
rotating assembly.(e.g. a hub or shaft).
 It has an advantage over sliding contact
bearing as it offers low friction.

9. FLYWHEEL AND PULLEY
 A flywheel used in machines serves as a reservior which stores energy
during the period when the supply of energy is more than the requirement
and releases it during the period when the energy is more than supply.
 Flywheels have a significant moment of inertia and thus resists changes in
rotational speed.
 The amount of energy stored in a flywheel is proportional to square of its
rotational speed.
 Energy is transferred to a flywheel by applying torque to it.

10.  A pulley is a wheel on an axle or shaft that is designed to support movement
and change of direction of a cable or a belt along its circumference.
 These are typically made of steel and rotate on conventional bearings.
Maximum speed is up to 60,000 RPM.
 The drive element of a pulley system can be a rope ,cable, belt or a chain
that runs over the pulley inside the grooves to lift loads,apply forces and to
transmit power.

11. DRIVEN – HACKSAW BLADE
 A hacksaw is a hand held tool used to cut through materials like plastic
tubing and meta pipes.
 Its cutting mechanism is provided by removable blades which feature sharp
teeth along their outer edge.
 Hacksaw blades are generally made up of carbon steel (or) high speed steel.

12. Bench vice
 It is a holding apparatus used to secure an object to allow work to be
performed on it.
 It has two parallel jaws, one fixed and the other movable, threaded in and
out by a screw and lever.

13. Mechanical Analysis
 Motor, driving Pulley (1) diameter= 0.0508 m
 Driven Pulley (1) diameter= 0.2032 m
 Therefore, Reduction Ratio= 4:1
 Speed of motor, N (driving) = 1400 rpm
 Driven Pulley speed N (1) = 350 rpm
 Power = 0.5 Hp = 0.373 kW
 Power = 2πNT/60
 Torque T (Driving) = 2.544 Nm

14.  Therefore, Torque T (Driven) (1) = 10.1768 Nm
 Driving Pulley (2) diameter= 0.0889 m
 Driven Pulley (2) diameter= 0.2032 m
 Therefore, Reduction Ratio = 2.285:1
 Driving Pulley speed N (2) = 350 rpm
 Driven Pulley speed N (driven) (2) = 153.17 rpm
 Torque T (Driving) (2) = 10.1768 Nm
 Therefore, Torque T (Driven) (2) = 23.25 Nm

15. DESIGN SPECIFICATIONS AND MATERIALS
The various parts have been designed like,
 Base Table (27×21×26)inch , material used is Mild steel.
 Back Arm(18×7) inch, material used is Mild steel.
 Collar Clamp Bearing(Ø25mm),material used is stainless steel. It is attached
with back arm.
 Shaft(20inch,Ø25mm)is used as connecting link for collar clamp ball bearing
and back arm, material is Mild steel.
 Flywheel (Ø8 inch)and material used is Cast iron.
 AC Motor(1400 rpm)is attached under base table.
 Pulley (Ø3.5 inch)is connected to AC motor and material used is Cast iron.

16. COST &ESTIMATION
S.N
O.
NAME SPECIFICATION MATERIAL QUANTITY COST
(RS)
1 AC MOTOR 1400 RPM,SINGLE
PHASE,0.5HP
MILD STEEL 1 4000
2 BACK ARM 18×8 INCH MILD STEEL 1 300
3 COLLAR CLAMP
BALL BEARING
ɸ25MM STAINLESS
STEEL
8 2000
4 UPPER ARM 33 INCH MILD STEEL 1 400
5 SHAFT ɸ 25MM,20 INCH MILD STEEL 4 300
6 FLYWHEEL ɸ08 INCH CAST IRON 2 1400
7 CONNECTING
ROD
7×1.5 INCH MILD STEEL 1 200
8 CRANK 4.25×1.5 INCH MILD STEEL 1 100

17. 9 PULLEY1 2 INCH CAST IRON 1 200
10 PULLEY2 3.5 INCH CAST IRON 1 250
11 V- BELT1 A 950 LP/
A40 B-SET
NEOPRENE
POLYSTER
1 185
12 V-BELT2 A 1001 LP/
A38 B-SET
NEOPRENE
POLYSTER
1 155
13 NUT ɸ12MM MILD STEEL 24 72
14 BOLT ɸ12MM MILD STEEL 22 240
15 WASHER ɸ14MM MILD STEEL 24 72
16 BENCH VICE 1 NO. MILD STEEL 1 750
17 TRANSPORTATION
CHARGE
1000
TOTAL 94 13070

18. ADVANTAGES
 EASY TO USE
 AUTOMATIC SO REDUCES MAN POWER
 TIME ,DEPTH OF CUT CAN BE MAINTAINED
 ECONOMICAL
 RENEWABLE ENERGY SOURCE
 LESS COST TO MAKE

19. DISADVANTAGES
 Cannot Be Used In Mass Production
 Cannot Be Used For Larger Diameters
 Cannot Be Used In Low Heat Conditions
 Strong Materials Will Take More Time