GD&T Datum Reference Frames 2

Question 1

In a datum reference frame, what is the maximum number of degrees of freedom that can be constrained?

Accepted Answer

6

Answer

3

Answer

4

Answer

9

Question 2

Which datum feature simulator contact rule applies when establishing a primary datum plane from a flat surface?

Accepted Answer

True contact with at least 3 points

Answer

Minimum contact with 1 point

Answer

Maximum inscribed contact

Answer

Minimum circumscribed contact

Question 3

A datum reference frame established by [A|B|C] uses datum A as primary. How many degrees of freedom does datum A constrain?

Accepted Answer

3

Answer

1

Answer

2

Answer

6

Question 4

What is a 'basic dimension' in relation to a datum reference frame?

Accepted Answer

A theoretically exact dimension used to locate a datum or feature

Answer

A dimension with a tolerance of ±0.001

Answer

A dimension measured from a datum

Answer

A dimension that requires no tolerance

Question 5

When a cylindrical feature is used as a secondary datum after a planar primary datum, how many additional degrees of freedom does it constrain?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 6

What does 'datum shift' allow when a datum feature is referenced at MMC?

Accepted Answer

Additional tolerance as the datum feature departs from MMC

Answer

The tolerance zone shifts toward the datum

Answer

The datum feature to move out of the tolerance zone

Answer

The feature to ignore the datum reference

Question 7

In GD&T, what is the term for the perfect geometric counterpart of a datum feature used during measurement?

Accepted Answer

Datum feature simulator

Answer

Datum axis

Answer

Datum reference plane

Answer

Datum target point

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