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Your Source for GD&T Training and
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| Circularity
Straightness
Position - Coaxial
Control |
| Another
Circularity Tip , Another
Straightness Tip, Position -
Coaxial Control Tip, Another Profile Tip
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If
You Want Location - Use Locating Controls.
Size and
form tolerances do not control location. On the Spool drawing,
it is intended that the individual lands align with one
another. The upper drawing could result in the part shown to
its right. Locating tolerances include profile of a surface
and position. To align the lands, one of these controls should
be used. The profile of a surface approach might be used if
the assembly area is making matched pairs and cannot have
interchangeability where the size tolerance is beyond the
process capability. Where the processes are capable of holding
the size and alignment (position) of the lands, the position
control would assure interchangeability.
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Note:
Although no datum reference has been used on the
position callout, position when applied to a pattern
controls the features within the
pattern. |
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