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What is Assembly Drawing and why do we need them?



What is Assembly Drawing and why do we need them?


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The sole purpose of assembly drawing is to show parts located in assembly. ..plus it provides the BOM.and additional details like how to assemble the parts..In which sequences...We also mentioned the torque required for bolts while assembling. ....sometimes standard requirements are provided with assembly drawings. ...

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Assembly drawing is important to show the whole system part and how to be assembled, also you can count the number of parts and specification of each one to be ordered or checked later.

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On 29/01/2017 at 9:26 PM, Kais Abdallah said:

we need an assembly drawing to know all components of the mechanism and how it function.

Assembly drawing is a detailed explanation of  a manufacturer component each and every part  detail's

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Assembly drawing is required when more than one component is assembled together to make the final assembly to be exactly the same that the designer conceived while designing.

Also,BILL OF MATERIAL gives details of number of parts required along with material specifications before actual assembly job is taken up.Normally detailed dimensions like size,,tolerances,surface finish specifications are not given in assembly drawing but overall dimension,weight etc are provided for the assembly and installation personnel to plan them in advance.Also special instructions for assembly job is provided in special cases.

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Let me tell a personal story related to this topic.

Something over 40 years ago, my boss, the manager of engineering for my employer, called me into his office. He told me that times were tight for the company, we were losing money at a furious rate (I already knew this).

He shoved a huge pile of drawings across the table to me, the full drawing set for a new product. I'd guess that there were about 500 drawings in all. There were about 200 individual parts in this product, and the rest of the drawings were assembly, notes, and BOM. It was a huge pile! (This was all pre-CAD, and everything was on paper.)

He told me that I was to be the project engineer for this product, to see that it got built and the order fulfilled. I felt sick. This really was not my bag. This is not what I came to work at that company to do, and I knew that I would be a nervous wreck if I had to take this own. He told me to take the drawings and start studying them. I would need to lay out an assembly line, specify the assembly equipment required, the number of stations, etc. It was all mine!!

I took the pile of paper back to my desk and began to look at the drawings. I could not make head nor tails of any of it. I could not find a final assembly drawing, even though I'm sure one was in there. I had only the vaguest idea what I was supposed to build.

I was planning to leave the company soon any way. I knew that they were going broke, and I wanted to get out before the roof fell in. I would prefer to wait a few months, but I could leave early if necessary. So,.... after about half an hour, .... I carried the whole pile back to the boss and put them on his desk. I told him that I would quit on the spot if he insisted that I take this job on. (I don't recommend doing this unless you have thought it out VERY CAREFULLY!!) I knew that I had leverage at that point, because the company urgently needed me for something else for which they had no one capable of doing. I knew that they had other much more experienced project engineers, who could take this on and deal well with it. But it was not for me. The boss looked unhappy, but he knew that I had the whip hand at that point.

He found someone else to take it on, I stayed a few more months to finish my essential job, and then I left. Shortly, the company went broke as expected, and it no longer exists at all.

So much for that pile of paper, piece part drawings and assembly drawings.


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