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Design and Fabrication Of Four Way Hacksaw-Mechanical Project

AUTOMATIC OPERATED FOUR WAY HACKSAW

ABSTRACT

The world today is moving ahead at a very fast pace. Some of the very common examples of fast moving objects are aeroplanes, high speed cars and many more. In our everyday life we come across many fast moving vehicles and so it is very important to measure the speed of these vehicles.

This is an era of automation where it is broadly defined as replacement of manual effort by mechanical power in all degrees of automation. The operation remains an essential part of the system although with changing demands on physical input as the degree of mechanization is increased.

Motor operated hacksaw consists of hacksaw frame, transformer, Control Unit, wiper motor, shafts and bench vice. It follows the principle of scotch yoke mechanism.

INTRODUCTION

We have pleasure in introducing our new project “AUTOMATIC OPERATED FOUR WAY HACKSAW”, which is fully equipped by sensors circuit and wiper motor. It is a genuine project which is fully equipped and designed for Machines. 

The  FOUR WAY HACKSAW  system is a fully automation project.

This is an era of automation where it is broadly defined as replacement of manual effort by mechanical power in all degrees of automation. The operation remains an essential part of the system although with changing demands on physical input as the degree of mechanization is increased.

Working:

4 way Hacksaw drawing
4 way Hacksaw drawing

Finally, most known hacksaw apparatuses include only a single hacksaw, operable therefore only to cut a work piece from one side only. Such devices are relatively slow in operation because they can only cut from one side. Known hacksaw apparatuses having two hacksaws are very bulky and heavy. The mechanical complexities of single hacksaw machines are compounded by having two opposed hacksaws.The invention therefore provides two essentially parallel spaced apart hacksaw blades, mounted on reciprocating support means in opposition to one another, which can be operated simultaneously so as to cut a bar from both sides at once.

More specifically, the invention provides a saw apparatus having the foregoing advantages in which the slid able guide means for guiding the blade frames are slid able towards and away from one another, by power operated means, such power operated means being mounted on said slid able guide means, and being reciprocal in association there with. Consequently, it would be advantageous to provide a four hacksaw apparatus, the blades of which are operable to apply a relatively constant force to a work piece during a cutting stroke. Furthermore, such blades ought preferably to have a more constant velocity during the cutting stroke in order to increase the overall speed of the cutting operation and in order to improve the efficiency of the cutting stroke. Such advantages should be obtained, if possible, without adding to the bulk, weight or expense of the hacksaw apparatus.

A wiper motor is placed at the centre of the frame and links are attached to each of the hacksaw frame for their operations for its operation scotch yoke mechanism is used. The Scotch yoke (also known as slotted link mechanism) is a reciprocating motion mechanism, converting the linear motion of a slider into rotational motion or vice versa. The piston or other reciprocating part is directly coupled to a sliding yoke with a slot that engages a pin on the rotating part.
 The shape of the motion of the piston is a pure sine wave over time given a constant rotational speed.

Four of the blades operates one after another to cut the metal pieces mounted on each vice. The blades slides on the shaft support and cuts the workpiece as the wiper motor requires 12volt dc supply so transformer is used to convert ac current into 12volt dc current and capacitor is used to supply the required energy to motor to operate.

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