sheet metal assembly drawing best practices 1

[durablack2]

I have one sheet metal assembly that made from 2 parts and is welded together. There are several bends on each part and each have several holes that need to line up at the assembly level. Would you guys typically separate the parts and dimension them in separate views or would you dimension them in an assembly view?

I feel as if I separate the assembly and dimension the parts in separate views this may indicate that there is some allowance for the holes to be slightly misaligned.

When manufacturing these parts they will be punched, bent, then welded together. I'm just curious what the best practices are for drawing these type of applications.

BTW, these are wide tolerance parts and currently there is no GD&T on this drawing.



Thanks

 

[SwinnyGG]

Best practice would be for each sub-component to have its own drawing, and then an assembly drawing to detail the assembly and welding.

 

[dgallup]

Unless you are putting the holes in at the assembly level, they should be detailed at the component level. You have to have a tolerancing scheme that will ensure they can be assembled with the inevitable misalignment.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[chez311]

durablack2,

Something very similar was discussed recently, you may find the below thread helpful.

https://www.eng-tips.com/viewthread.cfm?qid=442508

 

[durablack2]

Thanks everyone.

I just read through the other thread, everything I needed.

 

[drawoh]

durablack2,

If you are sending a drawing out and getting a permanent part back, it is a fabrication drawing, not an assembly. Any subcontract drawing should show the vendor what you will accept, and pay for. There may be more than one way to assemble this thing, and you may not care. If showing the separate pieces is a convenient way to communicate what you want, the practise is okay. Normally, I would show the complete part.

When you say "assembly" to me, I expect assembly instructions and a BOM. I would expect it to be build in-house.

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JHG