Deck 15: Size Datum Features Rmb

Question 1

In the case where a surface is the primary datum feature, a diameter is the secondary datum feature at RMB, and a width is the tertiary datum feature at RMB, the datum reference frame consists of a plane and an axis with two planes passing through it.

Answer 1

True

Question 2

Where a planar surface is designated as a primary datum feature and referenced in a feature control frame at RMB, a(n) ____________________ plane is established.

Answer 2

datum

Question 3

An internal diameter is designated as a(n) ____________________ datum feature and referenced in a feature control frame at RMB, resulting in a datum axis being established.

Answer 3

secondary

Question 4

Where a diameter is designated as a datum feature and referenced in a feature control frame at RMB, the resulting datum is a(n) ___________________.

Question 5

Where a diameter is used as a primary datum feature at RMB, how many degrees of freedom are constrained?

Question 6

When referencing a planar surface as a primary datum feature and a diameter as a secondary datum feature RMB, what are the five conditions that apply?

Question 7

When a feature of size is specified as a datum feature, and referenced in a feature control frame, what are the two conditions that exist?

Question 8

Explain how a datum axis may be established where an internal diameter is designated as a secondary datum feature and referenced in a feature control frame at RMB.

Question 9

Per Rule #2, MMB is the default condition referenced by a size datum feature.

Question 10

Datum feature selection and datum feature reference are directly related to how a part functions in its assembly.

Question 11

Where a feature of size is referenced at RMB, three conditions exist.

Question 12

Regardless of material boundary indicates that a datum feature simulator is adjustable (or movable) from MMB toward LMB until it makes maximum contact with the extremities of the datum feature(s).

Question 13

One method for specifying a feature of size as a datum feature is by associating the datum feature symbol on a(n) ____________________ line of a feature of size dimension.

Question 14

What are the two conditions that exist where a size datum feature is referenced at RMB?

Question 15

____________________ are two (or more) diameters that are shown on a drawing as being on the same center line.