Deck 14: Datum Targets

Question 1

Datum targets should be specified on parts where it is not practical (or possible) to use an entire surface as a datum feature.

Answer 1

True

Question 2

A(n) ____________________ is a designated area used in establishing a datum.

Answer 2

datum target area
datum target

Question 3

What are the three different ways a datum target line symbol may be specified on a drawing?

Answer 3

A datum target line symbol may be specified three different ways on a drawing.
The symbol may be shown and dimensioned on a plan view of the surface to which it is being applied. Where a plan view is not available, the target symbol can be shown and dimensioned in an edge view. Since the edge view of a line is a point, where a line target is shown in an edge view, the point symbol is used. The third method is to show and dimension the line symbol in the plan view and the point symbol in the edge view.

Question 4

What are the two types of symbols included in a datum target application?

Question 5

Datum targets are shown on an engineering drawing and describe datum feature ____________________.

Question 6

Where datum target points are used to establish a primary datum from a planar surface, ____________________ target points are used.

Question 7

When using datum targets to establish a complete datum reference frame, which three requirements should be met?

Question 8

The side of a gauge pin is often used as the datum feature simulator for a datum target line.

Question 9

The symbol for a datum target point is a(n) ____________________-shaped symbol.

Question 10

Datum targets can be used to establish a simulated datum from irregular surfaces.

Question 11

Datum targets cannot be used to establish a simulated datum from a feature of size.

Question 12

What does a pointed end on the datum target symbol indicate?

Question 13

When specifying datum targets on a drawing, explain why the datum targets may indicate fixed or movable datum feature simulators.

Question 14

Where a datum target line or area is indicated on a non-planar surface, a flat-tipped gauge element is often used as the datum feature simulator.

Question 15

A(n) ____________________ gauge pin is often used as the datum feature simulator for a datum target point.