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  1. B

    Perpendicularity callout with curved datum

    I re-created this drawing for illustration purposes. All the flat sides/surfaces are actually not flat (so cannot be used as datums). The intention is for dia4 hole to be perpendicular to curved surface (R10). But is this FCF correct? (whether by ASME or ISO) If Datum A was re-defined as a...
  2. B

    How to convert linear dimensions to GD&T

    Hi all, I have 2 dimensions which I hope to change to GD&T control. In the dwg represented below, dim 18 is meant to control the minimum width excluding root radius. Another part will fit in here. (a) I'm thinking this can be controlled by Profile of surface (with unequal tol). Please advise...
  3. B

    Can I omit Basic dimensions?

    My drawings are created (& read) in 3D format (MBD). I read an article that basic dimensions can be omitted in MBD; the main advantage being shorter dimensioning time. I only know 2 situations where basic dimensions are required: (a) for designer's information (to track changes or apply in...

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