Technologies
Private
Limited
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Protosys
Technologies Private Limited |
| M/s. Jetex Carburettors Ltd is a company involved in developing carburettors for two-stroke engine driven vehicles e.g. scooters, motor-cycles, mopeds etc. They cater to both, the OEM & the spares market in India. Earlier (before 1996), Jetex used to develop about one or two models every year. However, now with a wider variety of two-wheeler models coming to India, the demand of the development team has gone up to about 4 to 6 models per year. |
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Apart from the design for mixing of air & fuel, development of a new model of a carburettor involves imparting a suitable exterior shape so that it fits properly into the available space of the vehicle. The design of internal elements is proprietary and usually under their control. However, the externals have to suit the specific vehicle. Proper dimensional drawings are usually available while developing a carburettor for supply to the OEMs but while developing it for the spares market the data for the overall dimensions and the matching contours have to be extracted all by themselves. |
| The conventional process of developing a new carburettor was to take these inputs on a drafting board and draw each and every part to ensure proper assembly. As the external body is of die cast zinc or aluminium or other non-ferrous alloys, a hand-made mock-up of the external shape made out of wood /clay was also used to verify the fitment of the carburettor on the vehicle. The entire process usually took about 4 to 6 months and also had the inherent problem of data in-consistency. Quite often, a small error would go un-noticed and resulted in modifications of the dies. This was adding to the cost apart from the valuable time loss. |
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Now the external dimensional parameters are fed into the CAD software and designing of the external features is done as per these constraints. Then using the library of internal parts the rest of the design is developed. The library consists of the commonly used internal parts with their dimensional and assembly relationship set-up parametrically. This enables a new design to be ready usually within a week. |
| The use of CAD software also facilitates the fast development of a prototype. The STL data of the external body of the carburettor is sent to a rapid prototyping service bureau, Protosys, and a more accurate mock-up of the new design is ready within another week. This is assembled on the vehicle and verified for the final fitment on it. After making any necessary modifications the new design is released. The entire process is now, typically completed within one month and results in no rejection due to a design error. |