When specifying datum targets on a drawing, explain why the datum targets may indicate fixed or movable datum feature simulators.
What will be an ideal response?
ANS:
Datum feature simulators are fixed if their datum target location is defined with basic dimensions in all directions. Datum target simulators are movable if their datum target location is not defined with basic dimensions in all directions.
Where basic dimensions are not used to define a datum target in a direction on the drawing, the datum target simulator is movable. Unless otherwise specified, the direction of movement is normal to the part surface. The movable datum target symbol is not required, but it may be shown on a drawing for clarity.
If it is desired to have the direction of movement of a datum feature simulator not normal to the part surface, then the movable target symbol and the direction of movement must both be specified on the drawing.
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