i need some useful ideas

Originally Posted by irfanahamed

First of all i thankyou for ur reply. And i didnt study engineering for this particular purpose. I did it for my personal intrest. Now to start a buisness i prefare to do A/C scraping since it will b profitable. And im a fresher in this feild.

What discipline in engineering did you get you degree in.

Engineering Disciplines

Engineering is broad field that is divided into various disciplines and sub-disciplines. The disciplines of engineering can be divided into four main categories, chemical, civil, electrical and mechanical engineering. Each main discipline will provide you with a “taste” of the various skills and knowledge required to work in any field related to the discipline.

There are also branches, or sub-disciplines, of these main disciplines that offers specialised knowledge in a particular field; for example an automotive engineer (branch of mechanical engineering) would focus on vehicle design and testing, while these in-depth subjects are generally not covered in mechanical engineering.

I am curious as to where you are located, its up to you to decide if you want to share this info. How old are you, and what in your experience motivates you into the scrap business? Why do you believe A/C will be profitable for you? Mike

Originally Posted by irfanahamed

Im from south india. Im just 24 years. Nd i dnt have any experience in the feild of scraping

Twenty five years ago I thought it would be a good idea to recondition the larger compressors used on heat pumps and larger commercial units, the hermetically sealed units are easy enough to open enabling you to re-weld the canister back together.

If you examine the canister you will note that the top half fits into an expanded lip to assist with alignment of the tow half pairs, then welded if you use a zip cut just below the weld do not go all the way through with the cut as your nearing a full through cut on the shell you will note a colour change as the metal being cut gets thinner. Be gentle at this point as we you do not want to damage the inner shell.

Once you have made the circumference fully cut gently tap the top half with a dead blow hammer to release it, Once the top half has been removed you will note that the oil cooler lines which are located at the bottom most part underneath the compressor motor are simply coiled and looped back out of the can, while t he larger copper line is the suction line make no internal connection but is simply brazed to the can.

Another small line attached to the compressor head is the high pressure line which is affixed with a bolt and a cap. You can remove this then place it out of t he way, the compressor motor is mounted on springs which dampen the sound.

The motor windings are located underneath the compressor head, once you remove the bolts form the spring suspension remove the electrical connection which is plugged into the bottom inside canister. Now you can lift out the whole compressor unit.

The motor will have a thermal protection device, check this for continuity both cold then heated to its rated limit to see if its working properly, A megger is used to check the insulation on the motor and will also show if any shorts are present. If the motor is shorted a rewind will be necessary.

I had difficulty in obtaining replacement reed valves for the compressor head but with laser cutting technology you could procure the proper grade spring steel sheet and gasket material to have your own reeds and gaskets cut.

If I were to have another go at this project I would specialise in the larger three phase units.

Amazing what can happen over a 25 year period, compressor parts no available online

Process - National Compressor Exchange

With the additional information you have added then here is a little advise based on assumptions made by me. If you are able to maintain yourself without a job for income then pursue your dream.

If you need employment to maintain yourself then pursue the job then pursue your dream part-time.

Alloy2, thanks for the education on the use of a megger for troubleshooting motors. My experience with a megger has been troubleshooting helo radio systems coax. It turns out it the same. 73. Mike

Originally Posted by alloy2

VA7ELM from British Columbia says your welcome.

Tell him "73 de ke4ilg" Mike