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4.19 SIMULTANEOUS REQUIREMENTS
A simultaneous requirement is where two or more
geometric tolerances apply as a single pattern or part
requirement. A simultaneous requirement applies to
position and profile tolerances that are located by basic
dimensions, related to common datum features referenced
in the same order of precedence at the same
boundary conditions. In a simultaneous requirement
there is no translation or rotation between the datum
reference frames of the included geometric tolerances,
thus creating a single pattern. Figures 4-39 and 4-40 show
examples of simultaneous requirements. If such interrelationship
is not required, a notation such as SEP REQT is
placed adjacent to each applicable feature control frame.
See Figs. 4-41 and 7-54 and para. 7.5.4.2. This principle
does not apply to the lower segments of composite feature
control frames. See para. 7.5.4.2. If a simultaneous
requirement is desired for the lower segments of two or
more composite feature control frames, a notation such
as SIM REQT shall be placed adjacent to each applicable
lower segment of the feature control frames.
4.19 SIMULTANEOUS REQUIREMENTS
A simultaneous requirement is where two or more
geometric tolerances apply as a single pattern or part
requirement. A simultaneous requirement applies to
position and profile tolerances that are located by basic
dimensions, related to common datum features referenced
in the same order of precedence at the same
boundary conditions. In a simultaneous requirement
there is no translation or rotation between the datum
reference frames of the included geometric tolerances,
thus creating a single pattern. Figures 4-39 and 4-40 show
examples of simultaneous requirements. If such interrelationship
is not required, a notation such as SEP REQT is
placed adjacent to each applicable feature control frame.
See Figs. 4-41 and 7-54 and para. 7.5.4.2. This principle
does not apply to the lower segments of composite feature
control frames. See para. 7.5.4.2. If a simultaneous
requirement is desired for the lower segments of two or
more composite feature control frames, a notation such
as SIM REQT shall be placed adjacent to each applicable
lower segment of the feature control frames.
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