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DATUM CALLOUT

DATUM CALLOUT

DATUM CALLOUT

(OP)
When 2 surfaces are to determine one datum plane, how is it called out on a design drawing? The two surfaces are in line, but interrupted by a rib (wall). Could I put a Datum A Symbol with "2X" or "2 SURFACES". Datum targets? Is there more than one solution. I understand an extension line is not acceptable for GD&T. Material is MIM (Metal Injection Molding).

Thank you.

RE: DATUM CALLOUT

First question, as usually, is: which standard and which version of the standard governs the drawing?
Assuming it is Y14.5-2009, fig. 4-23 is what you probably need to look at first.
Datum targets can also be used, but I would use them only if some portions of the interrupted surface are acting as datum features.

RE: DATUM CALLOUT

(OP)
The standard is ASME Y14.5-2009 and figure 4-23 is exactly what I need. Darn on missing it. Thank you very much.

RE: DATUM CALLOUT

(OP)
KENAT......I will look at the section on coplanarity. Thanks.

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