CNC IP Practice Test

Question 1

Why is CNC technology adapted to many millwork manufacturing settings?

Answer 1

It Is reliable, accurate and cost effective

Question 2

When CNC technology is used for making different custom components, what type
of manufacturing is that company engaged in?

Answer 2

Intermittent

Question 3

You have a set up a CNC machine to produce case parts for a simple type of unit. All the parts
are identical. Which term describes your operation?

Answer 3

High volume - low mix

Question 4

While reorganizing your shop you decide to place the radial arm saw, the jointer and the
planer close together. What have you been considering when you make this decision?

Answer 4

Process flow

Question 5

When you reorganized your plant floor from an assembly line to a U-shaped work cell. What are
two results you expect from this

Answer 5

Same production, fewer workers

Question 6

At your shop, you only have production space and never carry an excess inventory of materials.
Why is this?

Answer 6

You are a just In time shop

Question 7

What information system helps control the manufacturing steps on cut sheet materials in some
large automated plants?

Answer 7

Bar codes

Question 8

After switching your shop over to a CNC based machining system, after a few months you are
unable to met expenses even though you still have good sales figures. What crucial analysis did
you fail to perform adequately

Answer 8

Return on investment

Question 9

In the picture below, what is the name of the process that decides how to break smaller pieces
out of a larger sheet?

Answer 9

Sheet optimization

Question 10

In which example below is CNC machinery best utilized?
a) The part is too complex and time-consuming to produce by hand
b) You are unable to get a cad drawing for a part produced quickly
c) You have many parts but no currently available program on file
d) The simple parts are normally produced on a regular table saw

Answer 10

a) The part is too complex and time-consuming to produce by hand

Question 11

What is the chief advantage of batching when using CNC equipment?

Answer 11

Reducing costs per unit

Question 12

Nesting technology is suited to which type of manufacturing?

Answer 12

Custom

Question 13

In CNC terminology, what is the Z axis on a 3 axis machine

Answer 13

Up and down

Question 14

Which type of CNC is adapted mainly for drilling holes in a single plane?

Answer 14

Point-to point

Question 15

When was NC manufacturing widely accepted and readily available?

Answer 15

1960

Question 16

What type of machine does not have programs stored in a computer and instead responds to
the direct input of the operator.

Answer 16

NC Machine

Question 17

What type of machine receives inputs from a program stored on a computer?
a) CNC machine
b) DET machine
c) NC machine
d) Point-to-point machine

Answer 17

CNC machine

Question 18

What percentage of woodworking machinery today are CNC’s?

Answer 18

85%

Question 19

True or False. Axis on CNC machines are defined as any point in two-dimensional space

Answer 19

F

Question 20

True or False. Setups and changeovers are quicker on conventional machines than on CNC
machines.

Answer 20

F

Question 21

Which of these power systems is not used on CNC machinery?
a) Electric
b) Magnetic
c) Hydraulic
d) Pneumatic

Answer 21

b) Magnetic

Question 22

An operator is turning on a CNC router to machine nested components out of a sheet of¾”
plywood. What is the order of operations they will follow?

Answer 22

Turn on the power, turn on the air, load the plywood, run the program

Question 23

What does a CNC machine require that will allow the control of the correct speed, direction
of rotation and the smooth transition of speeds for all operations?

Answer 23

frequency converter

Question 24

What type of power system is used as the motive system to power a CNC’s cutter head (as in a
router) or to activate the beam (as in a panel saw)?

Answer 24

Compressed air

Question 25

Hydraulics used in larger machines uses what process to create movement?

Answer 25

liquid

Question 26

What are hydraulics used for in CNC machinery?

Answer 26

Clamp spindles

Question 27

What device on a CNC router may be programmed to automatically control the machines correct speed, the direction of rotation and the smooth transition of speeds for all operations?

Answer 27

Frequency converter

Question 28

What type of motor in a CNC machine is highly precise and the most popular choice in industry today?

Answer 28

Servo

Question 29

True or False. A servo motor on a CNC rotates to a fixed number of degrees when it receives and electrical pulse.

Answer 29

F

Question 30

What type of electrical motor operates in a smooth, continuous motion, which results in highly desirable machining characteristics?

Answer 30

Servo

Question 31

What type of CNC machine is seen in this graphic?

Answer 31

NP Gantry rail

Question 32

On a gantry rail CNC router what is the axis of movement that defines when the tool is extended or retracted vertically in and out of the work piece?

Answer 32

Z

Question 33

True or False. In larger machines, chains are used for driving cutters

Answer 33

F

Question 33

What type of mechanism is seen in this graphic?

Answer 33

NP Ball screw

Question 34

What type of CNC devise is seen in this graphic?

Answer 34

NP Vacuum pods

Question 35

True of False. In this graphic the material does not move?

Answer 35

NP True

Question 36

True or False. In this CNC machine configuration, the material does not move.

Answer 36

F

Question 37

What controls the movement of a table, material or cutterhead beyond pre-set limits?

Answer 37

Limit switches

Question 38

What function does the safety device shown in this graphic do?

Answer 38

NP does not allow the machine to operate

Question 39

On a CNC machine, what main control device stores the information and tells other components what to do?

Answer 39

machine control unit

Question 40

On a CNC machine, what does MRZ stand for?

Answer 40

machine reference zero

Question 41

A CNC operator is facing the front of a CNC point-to-point machine. The machine has just drilled a 19mm hole in a sheet of 25 mm thick MDF. As programmed, the machine now moves 355 mm to the operator's right and drills another 19mm hole. What is the distance between the edges of the two holes?

Answer 41

336 mm

Question 42

A CNC operator is facing the front of a CNC point-to-point machine. The machine has just drilled a¾" hole in a sheet of 25 mm thick MDF. As programmed, the machine now moves 355 mm to the operator's right and drills another¾" hole. What were the machines axes of movement during these programmed commands?

Answer 42

NP Z and X

Question 43

When a CNC machine is set up to work from part reference zero, what location will the cutter head begin machining on the part?

Answer 43

lower left

Question 44

A CNC router is machining a part. In reference to the operator who is facing the machine what is the direction of travel of the cutter if the bit is moving from X3 Y2 to X3 Y355?

Answer 44

Front to back

Question 44

A CNC router is machining a part. In reference to the operator who is facing the machine what is the direction of travel of the cutter if the bit is moving from X35 Y2 to X14 Y2?

Answer 44

Right to left

Question 45

On CNC machines, what does the code seen in this graphic control?

Answer 45

NP Specific movement of the tool

Question 46

In reference to the program controls of a CNC, what is the purpose of M-Codes?

Answer 46

Activate or de-activate a performance or task

Question 47

What term describes the arrangement of parts that are cut out of one sheet, so all the parts are arranged to fit together while leaving space for the kerf or swath of the tooling?

Answer 47

Nesting

Question 48

True of False. Cell manufacturing means a grouping of machines and processes to deal with unusual product configurations

Answer 48

False

Question 49

What does the term CAM stand for?

Answer 49

Computer Aided Manufacturing

Question 50

On a CNC router, if you are working in a Z positive axis where would the cutter be? a. Cutting into the work piece

Answer 50

Anywhere above the work piece

Question 51

When we talk about CNC machines and say that they have high repeatability compared to conventional machining techniques, what does that mean?

Answer 51

They are more accurate

Question 52

On a CNC router, what is meant by the term, tool compensation?

Answer 52

A+ or- offset of the line

Question 53

You are using a CNC router with a 4' x 8' bed. Which way does the X axis run?

Answer 53

Along the 8' dimension

Question 54

With respect to CNC routers, what are G codes?

Answer 54

Preparation codes

Question 55

On a CNC router, which axis is working in a negative value when the tool is cutting?

Answer 55

Z