Power hacksaw machine

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. I ntroduction 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 H p = 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 M ild 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.NO. 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