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• # Unknown Drawing Line and Dimensioning

Discussion in 'Engineering Drawings' started by MuhammadHaris, Apr 11, 2014.

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Hello, there!
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My name is Muhammad Haris, and I'm a recently graduated Mechanical Engineer.
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A few days ago, I happen to receive a drawing with a FRONT VIEW shown below in the image. The only point of interest in this drawing is the yellow highlighted area. In drawing, a thick part line was given which was extending out from a given feature horizontally (Please note that I have replicated the original drawing below, I have checked this view many times to ensure it gets posted rightfully).
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Now my questions are:
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1. What does that thick line represent in the drawing?
2. How and where am I going to maintain that size of 25 mm?

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NOTES: The dimensions represented in BLUE COLOR were strictly given in the drawing. The dimension in RED COLOR was calculated by me to estimate the difference in height, and also, note that the tolerances are ignored just for the sake of simplicity.
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Image Link 2: 3D View: http://i58.tinypic.com/efh0kh.png
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Looking forward to your precious feedback.

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3. ### ErichWell-Known Member

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I have no idea what the purpose of that line is. I think it is an extraneous line that should not be there.

Assuming the isometric picture is correct, the line in question should not appear in the front view.

Who created the drawing and can you ask them what is up?

I think the 25 mm dimension is from the vertical wall on the right to the vertex of the angled surface on the left.

4. ### bdeuellMember

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My guess is that the line was included to clarify that the two top surfaces are not in the same plane. Perhaps this could have been done more clearly by placing a reference dimension where you have placed your red dimension.

I agree the 25mm dimension is to the vertex of the angled surface.

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Thanks Erich and
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6. ### SOCrouseNew Member

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Jul 2014
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As continuing education after a 20 year absence, I reviewed your problem of a few months ago. *By now you've no doubt moved on to other things. *However, the resolution would be of interest if you would chronicle it.

Notwithstanding, concerning the problem I'm no expert, but it looks like unfinished work. *If it were I, backtracking to the source if possible would give the answer. *In lieu of that, subject the information you do have to the 3F (form, fit, and function) requirements, and generate an adequate design and print (drafting).

This is a good problem for those of us who are green (as we say here in the USA), because as my earlier undergraduate Statics instructor told us: your greatest tool as an engineer is communication. *I would add that it is one of the general rules of life, applicable to all work.

Finally, I hope the following link is of some primitive help.* http://en.wikipedia.org/wiki/Datum_reference

Thanks for taking the time to post the problem. *Stephen

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