Brain fart Monday: Question about dimensioning

[vonsteimel]

Greetings,
I've attached a quick sketch.
Pretty sure I know the answer here but I thought I confirm with your opinions.

I've been given a drawing to check that looks like the top example. Now the shop made this (before it was checked) without a problem. However, we are going to outsource so I want it to be correct.

In the top example the bottom corner (called out with a leader) is insufficiently defined, correct? I believe it should be defined also in one of the two ways shown on the bottom of the illustration? Do you agree?

Otherwise the machinist has to assume that those corners are symmetrical otherwise.
Thanks,

VS

 

[ctopher]

I would use the bottom-left dwg.
There is nothing that indicates any feature is symmetric.

Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion

 

[KENAT]

You are correct that the top image is as a minimum missing a dimension.

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[pmarc]

vonsteimel,
I hope you are aware that regardless of dimensioning scheme chosen the drawing has to show much more - I am specifically thinking about linear and geometric tolerances.

But assuming that you just want to check whether nominal geometry of the contour has been fully defined, I see one inconsequence on both bottom pictures. You are focusing on .50 dimension. What about .75 dimension? Doesn't the same issue apply to this dimension?

 

[ewh]

I agree with pmarc; either both the .50 dimension and the .75 dimension need to be "2X" or they need to be shown twice.

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-Dalai Lama XIV

 

[KENAT]

Doh, yep another 2X or equivalent required. Pmarc that's what I meant by 'as a minimum'.

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[vonsteimel]

Yeah the 0.75 will get one too. I was just sticking to an example.

Of course it has tolerances...? and a titleblock.etc Just a quick sketch here to get the question across.

Thanks for your input everyone.