Question 1

Describe a surface model.

Accepted Answer

A surface model can be described as a wire-frame model with a sheet of material stretched over it. In a solid model, no hidden surfaces or edges are shown.

Question 2

Describe the STEP-NC language.

Accepted Answer

In 2007, a new machine tool control language was developed to enhance the older G-code. It is a language that connects CNC process data with the product description of the product being machined. Called STEP-NC, it allows tool parts descriptions to be independent of the machine tool. It also allows parts inspection information to be passed back directly to the machine tool to correct process errors.

Question 3

Describe the object in the accompanying figure.

Accepted Answer

The figure is a partial wire-frame model. A wire-frame model appears to be transparent, using lines to represent all edges. Hidden edges are indicated with broken lines.

Question 4

The ____ movement of indicating movement to points or positions defines a point from the machine's current position.

Accepted Answer

A)  incremental 
B)  relative 
C)  perspective 
D)  absolute 
A)  incremental 
B)  relative 
C)  perspective 
D)  absolute

Question 5

The zero origin point is called the ____.

Accepted Answer

A)  horizon point 
B)  real zero 
C)  internal zero 
D)  machine zero 
A)  horizon point 
B)  real zero 
C)  internal zero 
D)  machine zero

Question 6

Many CNC machines use a(n) "____" code programming to define a tool path and speed to draw or make a part.

Accepted Answer

A)  C 
B)  G 
C)  H 
D)  J 
A)  C 
B)  G 
C)  H 
D)  J

Question 7

In the ____ system, values are drawn so the x direction is the horizontal axis, y is drawn in the vertical axis direction, and z is perpendicular to the x and y axis.

Accepted Answer

A)  Cutting Coordinates 
B)  Machine Coordinates 
C)  World Coordinates 
D)  View Coordinates 
A)  Cutting Coordinates 
B)  Machine Coordinates 
C)  World Coordinates 
D)  View Coordinates

Question 8

The ____ method of indicating movement to points or positions defines a point from machine zero.

Accepted Answer

A)  relative 
B)  perspective 
C)  absolute 
D)  incremental 
A)  relative 
B)  perspective 
C)  absolute 
D)  incremental

Question 9

With ____, the axes of the object remain attached to the same view even if the object is rotated.

Accepted Answer

A)  World Coordinates 
B)  View Coordinates 
C)  Machine Coordinates 
D)  Cutting Coordinates 
A)  World Coordinates 
B)  View Coordinates 
C)  Machine Coordinates 
D)  Cutting Coordinates

Question 10

Describe why world views are useful when programming CNC machines.

Accepted Answer

World Views are very useful wh

Question 11

How can stereolithography printing help the manufacturing process?

Accepted Answer

Equipment called Stereolithography or 3-

Exam 45: Two-Dimensional and Three-Dimensional Cad Sketching

Describe a surface model.

Describe the STEP-NC language.

Describe the object in the accompanying figure.

The ____ movement of indicating movement to points or positions defines a point from the machine's current position.

The zero origin point is called the ____.

Many CNC machines use a(n) "____" code programming to define a tool path and speed to draw or make a part.

In the ____ system, values are drawn so the x direction is the horizontal axis, y is drawn in the vertical axis direction, and z is perpendicular to the x and y axis.

The ____ method of indicating movement to points or positions defines a point from machine zero.

With ____, the axes of the object remain attached to the same view even if the object is rotated.

Describe why world views are useful when programming CNC machines.

How can stereolithography printing help the manufacturing process?

Bases for Blueprint Reading and Sketching

The Alphabet of Lines and Object Lines

Hidden Lines and Center Lines

Extension Lines and Dimension Lines

Projection Lines, Other Lines, and Line Combinations

Three-View Drawings

Arrangement of Views

Two-View Drawings

One-View Drawings

Auxiliary Views

Size and Location Dimensions

Dimensioning Cylinders, Circles, and Arcs

Size Dimensions for Holes and Angles

Location Dimensions for Points, Centers, and Holes

Dimensioning Large Arcs and Base Line Dimensions

Tolerances Fractional and Angular Dimensions

Tolerances Unilateral and Bilateral, Decimal Dimensions

Interchangeable Parts, Allowances, and Classes of Fit

Representing and Dimensioning External Screw Threads

Representing and Specifying Internal and Left-Hand Threads

Dimensioning Tapers and Machined Surfaces

Dimensioning With Shop Notes

Metric System Dimensioning and Iso Symbols

First-Angle Projection and Dimensioning

Metric Screw Threads, Dual Dimensioning, and Tolerancing

Cutting Planes, Full Sections, and Section Lining

Half Sections, Partial Sections, and Full Section Assembly Drawings

Datums Ordinate and Tabular Dimensioning

Geometric Dimensioning, Tolerancing, and Datum Referencing

Caddcamcim and Robotics

Welding Symbols, Representation, and Dimensioning

Surface Development and Precision Sheet Metal Drawing

Detail Drawings and Assembly Drawings

Sketching Horizontal, Vertical, and Slant Lines

Sketching Curved Lines and Circles

Sketching Irregular Shapes

Sketching Fillets, Radii, Rounded Corners, Edges, and Shading

Freehand Vertical Lettering

Freehand Inclined Lettering

Orthographic Sketching

Oblique Sketching

Isometric Sketching

Perspective Sketching

Pictorial Drawings and Dimensions

Proportions and Assembly Drawings

Filters