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I have a drawing and it makes no sense to me whatsoever. There is an A datum, "bottom" surface, as you would expect. There is a rectangular slot that is shown as Basic, while the OD of the part has a positional callout back to datum A (only). Then there is a four-bolt hole pattern, but each hole has a positional callout to both datums A and B. Oh, and the B datum is identified as this Feature Control Block. The diameter of the bolt hole pattern is a reference dimension.
Please, please either explain this to me, or tell me I'm not crazy and this doesn't make sense. Thanks in advance.
Please, please either explain this to me, or tell me I'm not crazy and this doesn't make sense. Thanks in advance.
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