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Engineering
General Engineering
GD&T- Positional tolerance question
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[QUOTE="Lnewqban, post: 6582957, member: 673625"] I would say yes. Omitting those dimensions may create confusion in a machinist, who may be not familiar with that part and the mentioned symmetry. As a vertical symmetry exists, and the center of the lower hole is to be measured from the lower surface, the total distance between reference C and the lower surface should be included, with tolerance perhaps. It is always good practice to imaging that the person(s) performing the machining knows nothing about the requirements that the designer has in mind. Unless it is incorrect or contradictory, the more information, the better (especially when a high number of parts are to be fabricated). For example, total exterior dimensions tell a machinist what size of metal he needs to initially cut, rather than leaving the math of adding up partial dimensions to him, with the potential of error and wasted material and effort. [/QUOTE]
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GD&T- Positional tolerance question
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