Design and Fabrication Of Semi Automatic Circular Path Gas Cutting Report

Design and Fabrication Of Semi Automatic Circular Path Gas Cutting Report


In this project “DESIGN AND FABRICATION OF SEMI-AUTOMATIC CIRCULAR PATH GAS CUTTING” main objectives is to bring out the idea of making circular path cutting in semi automatic manner without manual handling.
Generally in conventional welding type, the cutting is done manually. As it is manual process, the chance for error is high moreover the accuracy is less, which leads to more tolerance. since in minute cutting operation, it is difficult to obtain the desired output. Particularly for cutting shapes, the conventional cutting method seems to more tedious. Here in our project, we suggest a new idea to overcome the difficulties in the conventional cutting.


In Our project ”DESIGN AND FABRICATION OF SEMI-AUTOMATIC CIRCULAR PATH GAS CUTTING” suggest a new method for circular path operation in cutting process.. An Oxy-Acetylene outfit is portable, inexpensive and versatile. By using the proper tips, almost any metal can be cut using the Oxy-Acetylene process. Acetylene is a gas that is manufactured by mixing Calcium Carbide with water. Acetylene, when burned alone, can produce a flame temperature of about 4000 deg. F. With the addition of Oxygen a flame temperature in excess of 6000 deg. F. can be achieved, making Acetylene ideal for welding and cutting. Today most welding is accomplished by arc welding, and gas is used predominately for cutting purposes. Oxy-Acetylene torch cutting relies on the combustion of fuel gases, usually Oxygen and Acetylene, to heat metals at the cutting point. Torch cutting is a quick and inexpensive solution to the problem of field cutting metals.


The common methods used in cutting metal are oxy gas flame cutting, air carbon-arc cutting, and plasma-arc cutting. The method used depends on the type of metal to be cut and the availability of equipment. As a Steelworker, oxy gas or air carbon-arc equipment is the most
common type of equipment available for your use.
The oxy gas cutting torch has many uses in steel- work. At most naval activities, the Steelworker finds the cutting torch an excellent tool for cutting ferrous metals. This versatile tool is used for operations, such as beveling plate, cutting and beveling pipe, piercing holes in steel plate, and cutting wire rope.
When using the oxy gas cutting process, you heat a spot on the metal to the kindling or ignition temperature (between 1400°F and 1600°F for steels). The term for this oxy gas flame is the PREHEATING FLAME. Next, you direct a jet of pure oxygen at the heated metal by
pressing a lever on the cutting torch. The oxygen causes a chemical reaction known as OXIDATION to take place rapidly. When oxidation occurs rapidly, it is called COMBUSTION or BURNING. When it occurs slowly, it is known as RUSTING.

Oxy-Acetylene process
Oxy-Acetylene process


An oxy gas cutting outfit usually consists of a cylinder of acetylene or MAPP gas, a cylinder of oxygen, two regulators, two lengths of hose with fittings, and a cutting torch with tips (fig. 4-1). An oxy gas cutting outfit also is referred to as a cutting rig. In addition to the basic
equipment mentioned above, numerous types of auxiliary equipment are used in oxy gas cutting. An important item is the spark igniter that is used to light the torch (fig. 4-2, view A). Another item you use is an apparatus wrench. It is similar in design to the one shown in figure 4-2, view B. The apparatus wrench is sometimes called a gang wrench because it fits all the connections on the cutting rig. Note that the wrench shown has a raised opening in the handle that serves as an acetylene tank key.

Working principle

The table consist of gear coupled motor, pinion, mating gear,bearing, revoving disc and guiding plate. the shaft of the motor to which pinion gear is fixed. The pinion is made to be matted with the large matting gear for the pupose of speed reduction. The shaft of the matting gear to which the revolving disc fixed.
The guiding plate in the revolving disc is used to hold the cutting torch. The gear coupled motor which acts as the external source of power transmits the speed from the pinion to matting gear and thus the speed gets reduced. Due to the revolving disc rotates the torch attached to it also rotated.
The forward and reverse motion of the disc is obtain by using forward and reverse switch. the work piece when placed on a bed at certain distance from the torch get cutted in circular path.


  • Portable.
  • Less space occupied.
  • Less maintenance.
  • Initial cost is less.


  • High safety precaution is required.
  • Chance to burst


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Sachin Thorat

Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos.

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