Deck 8: Computer Numerical Control

Question 1

Most modern CNC machines employ a high-tech modernized version of ways called ____.

A) linear guides
B) linear interpolation
C) modal interpolation
D) origin guides

Answer 1

A

Question 2

____ programming was developed to simplify the machine programming process.

A) Modal
B) Address
C) Conversational
D) Safe-start

Answer 2

C

Question 3

____ traverse is designated by the code G0.

A) Circular
B) Linear
C) Modal
D) Rapid

Answer 3

D

Question 4

When using ____ positioning, the coordinates of all positions will be referenced from the beginning.

A) absolute
B) polar
C) incremental
D) conversational

Question 5

CNC programming does not use north, south, east, or west to identify distance and direction, but instead a similar system called the ____ system.

A) absolute positioning
B) polar coordinate
C) Cartesian coordinate
D) incremental positioning

Question 6

A(n) ____ assembly device consists of a screw and nut assembly with steel balls in place of threads.

A) block nut
B) linear guide
C) encoder
D) ball screw

Question 7

____ coordinates require that positions be identified by defining both an angle and a distance (like a vector in mathematics).

A) Absolute
B) Incremental
C) Linear
D) Polar

Question 8

A(n) ____ motor is a hybrid electric motor with half motor/half position sensor.

A) modal
B) servo
C) block
D) encoder

Question 9

The X- and Y-axes of the Cartesian coordinate system divides the system into four separate regions called ____.

A) dimensions
B) modals
C) quadrants
D) planes

Question 10

____-codes are used to turn on and off miscellaneous (auxiliary) functions.

A) G
B) M
C) F
D) A

Question 11

The ____ positioning system specifies a distance from the current position to the next position instead of a location related to the origin.

A) rectangular
B) incremental
C) circular
D) absolute

Question 12

CNC mills with an ATC are called ____.

A) traverse mills
B) machining centers
C) turning centers
D) positioning mills

Question 13

Programming code that the machine can understand is called ____ address.

A) word
B) modal
C) encoded
D) traverse

Question 14

Linear interpolation produces a(n) ____ line between two points.

A) curved
B) angled
C) arced
D) straight

Question 15

The CNC program is created and stored in the ____.

A) rectangular coordinate system
B) modal control unit
C) machine control unit
D) origin control system

Question 16

____-codes prepare a machine to engage in a particular mode for machining.

A) P
B) C
C) G
D) M

Question 17

A(n) ____ works by recording the amount of rotation a motor makes (in degrees).

A) guide
B) code
C) encoder
D) leader

Question 18

When a CNC lathe is equipped with an automatic tool changer it is called a ____.

A) turning center
B) modal center
C) servo motor
D) machining center

Question 19

The place a traveler begins from is called the point of ____.

A) foundation
B) origin
C) cause
D) source

Question 20

____ interpolation motion causes the cutter's path to travel in an arc.

A) Circular
B) Linear
C) Rapid
D) Modal

Question 21

The characters I and ____ are used to define the arc center point in the X- and Z-axes.

A) C
B) J
C) K
D) M

Question 22

____ consist of a straight round shank with a tapered bore.

A) Hardinge HDB drill bushings
B) CNC collet chucks
C) Split drill bushings
D) Nose collar threads

Question 23

____ tools are small motorized spindles that enable a turning machine to perform light-duty milling and to perform hole-work such as drilling, tapping, and reaming off-center and cross-ways.

A) Live
B) Cell
C) Robotic
D) Turret

Question 24

A ____ is a tool that is mounted to the turret and, when programmed, can approach the remaining bar material after a part has been cut off.

A) power chuck
B) bar feeder
C) bar puller
D) grooving tool

Question 25

When programmed ____, all X coordinates are given as a radius of the part.

A) radially
B) diametrally
C) linearly
D) algebraically

Question 26

____ type machines typically are of a flat bed design and are fitted with a carriage where tools are installed.

A) CNC lathe
B) Swiss-type
C) Dovetail
D) Gang tool

Question 27

When programming ____, the programmer does not need to reduce the entry feed rate because there should be no significant synchronization error.

A) floating tap holders
B) collet chucks
C) turning canned cycles
D) rigid tapping

Question 28

A feature called ____ may be used instead so that the spindle RPM is automatically updated for the diameter being cut (the surface speed across the tool's cutting edge is always constant).

A) CNC
B) IPM
C) CSS
D) MCU

Question 29

Most turning centers are fitted with a circular ____ where all of the tooling is mounted.

A) top plate
B) lathe
C) turret
D) sub-spindle

Question 30

____ can be placed at the beginning of each block of code to serve as a label for each block.

A) Tool-change commands
B) Program stop commands
C) Safe-start commands
D) Sequence numbers

Question 31

At the very end of each block is a semicolon (;) character is called a(n) ____ character.

A) miscellaneous function
B) end of block
C) end of origin
D) preparatory command

Question 32

In order to move the tool in a linear movement on a turning center, a ____ is commanded along with the coordinates for the end position for the movement.

A) G0
B) G1
C) G2
D) G3

Question 33

A ____ is an auxiliary secondary spindle, which opposes the machine's main headstock spindle.

A) lathe
B) sub-spindle
C) turret
D) gang tool

Question 34

Once ____ is properly turned on, the MCU makes all necessary compensation and the part coordinates may be programmed as though the cutting tool did not have a radius at all.

A) TNRC
B) RCTC
C) TOQ
D) CCW

Question 35

The ____ operation is usually the first operation to be performed on a turned workpiece.

A) drilling
B) facing
C) contouring
D) roughing

Question 36

When a machine is programmed ____, all X coordinates are expressed as diameters.

A) linearly
B) diametrally
C) radially
D) algebraically

Question 37

Two M-codes can be used to cause a ____, or hold, on the program until it is resumed by pressing the cycle start button on the MCU.

A) program stop
B) sequence number
C) tool-change offset
D) coolant code

Question 38

____ cycles require the programmer to write a block or two of code in a specified format.

A) Finishing
B) Floating
C) Canned
D) Rigid

Question 39

____ tool-mounting adapters have a round shank with a serrated tooth pattern.

A) VDI
B) CNC
C) Quick-change
D) Dovetail

Question 40

____ are versatile because they can hold a broad range of diameters and can be used to grip on either the OD or ID of workpieces.

A) Clamps
B) Collets
C) Lathes
D) Chucks

Question 41

The ____ flange was originally developed specifically for CNC use by Caterpillar Inc.

A) BT
B) ER
C) TG
D) CAT

Question 42

The ____ knob is gripped by a power-actuated drawbar mechanism in the machine spindle to secure the mating tapers.

A) BT
B) chuck
C) retention
D) collet

Question 43

The ____ is used for the machine's own reference purposes and helps it to keep track of how far each axis can move before it runs out of travel.

A) MCS
B) MDI
C) WCS
D) DNC

Question 44

Once tool measurements have been determined, those tool offset measurements are stored in the machine's ____ offset page.

A) wear
B) run
C) geometry
D) work

Question 45

The Cartesian coordinate system that identifies the location of the origin on the workpiece is called the ____.

A) MCS
B) DNC
C) MDI
D) WCS

Question 46

____ mode allows the ability to execute only one block of the program at a time.

A) Single-block
B) Dry run
C) Drip feed
D) Safe offset

Question 47

The distance from the MCS to the WCS is called ____ offset.

A) work
B) jog
C) geometry
D) wear

Question 48

Axis ____ buttons and a small rotary handwheel allow manually controlled axis movement for machine setup.

A) feed
B) jog
C) offset
D) run

Question 49

____ controls slow rapid motion while a program is running or vary the jogging rate.

A) Feed rate override
B) Dry run
C) Rapid override
D) Direct override

Question 50

____ allows verification of the paths the tool will take by watching a simulated computer model cut the part on a display screen.

A) Dry-run
B) Graphic simulation
C) Safe offset
D) Auto mode

Question 51

____'s popularity is due partly to the versatility of workholding, the inherent rigidity of the machine's column, and the ability to allow gravity to help remove chips out of the machining area.

A) HMC
B) VMC
C) CNC
D) ATC

Question 52

When using TNRC, the tool tip ____ orientation must also be entered in the geometry offset page.

A) quadrant
B) axis
C) coordinate
D) dimension

Question 53

The configuration of a modern ____ can be compared to a standard vertical knee-type mill.

A) ATC
B) VMC
C) HMC
D) CTT

Question 54

After the machine has been properly turned on, most machines require a reference return to the machine's origin, or ____ position of the MCS.

A) work offset
B) machine home
C) machine coordinate
D) work coordinate

Question 55

____ is the method whereby the machine control only accepts as much code as it can process at a time.

A) DNC
B) MCS
C) WCS
D) MDI

Question 56

The ____ knob allows the programmed feed rate to be decreased, increased, or even stopped.

A) wear offset
B) feed rate override
C) rapid override
D) prove-out

Question 57

The ____ tool changer uses a double-ended arm to change tools.

A) carousel-type
B) CAT
C) swing-arm-type
D) endmill

Question 58

Generically speaking, a ____ refers to running a machine with disabled functions to eliminate the potential for collisions.

A) graphic simulation
B) safe offset
C) dry run
D) single-block

Question 59

____ mode provides a blank program screen for entering short programs or single program commands required for machine setup.

A) MDI
B) MCS
C) WCS
D) DNC

Question 60

____ offsets may be used to compensate and adjust for wear as the tool is used during production.

A) Geometry
B) Tool
C) Run
D) Wear

Question 61

____ holders are inexpensive, rugged, simple, and capable of transmitting a lot of torque, but there are a few disadvantages.

A) Endmill
B) Collet chuck
C) Shrink-fit
D) Drill chuck

Question 62

Using a combination of a T- and M-word command in a single block is performing a ____.

A) tool height offset
B) program stop
C) tool change
D) clearance change

Question 63

Offsetting the path of the cutting tool is called ____ compensation.

A) left-side
B) right-side
C) cutter radius
D) automatic

Question 64

The ____-command provides the spindle RPM.

A) S
B) M
C) G
D) N

Question 65

The ____ flange holders have a thicker flange with an off-center groove.

A) DA
B) BT
C) CAT
D) TG

Question 66

____ cycles feed the tool continuously to the programmed Z-depth without pecking.

A) Single-pass drilling
B) Circular
C) Radius
D) Two-dimensional

Question 67

____ vises are the most commonly used workholding devices for milling because they are highly versatile, accurate, and simple to use.

A) Clamp
B) Step
C) Machine
D) Toggle

Question 68

Most commonly used in horizontal spindle machines, a ____ is a tower with multiple vertical working surfaces where workholding devices are mounted.

A) manual collet fixture
B) pallet system
C) double vise
D) tombstone

Question 69

The coolant command ____ refers to the command for mist coolant.

A) M3
B) M7
C) N2
D) G93

Question 70

A G73 commands the ____ drilling cycle and uses only slight retracts.

A) fast-peck
B) single-pass
C) deep-hole peck
D) peck

Question 71

Some machines have a more accurate method of mating the spindle RPM and feed rate throughout the entire tapping cycle, which is called ____ tapping.

A) rigid
B) standard
C) initial plane
D) radial

Question 72

When the machine knows where the tool tip is so that the tool can be programmed from its tip regardless of its length, this is called the ____ offset.

A) tool height
B) tool change
C) clearance
D) geometric

Question 73

In CNC mill programming, it is standard practice to establish a safety zone above the workpiece or workholding device called a ____.

A) change plane
B) clearance plane
C) cutter offset
D) dwell

Question 74

____ systems use two or more workholding tooling plates that can be quickly and accurately interchanged on the machine's table.

A) Pallet
B) Manual jaw
C) Tombstone
D) Vacuum plate

Question 75

____ mode provides a blank program screen for entering short programs or single program commands.

A) MDI
B) MCU
C) MCS
D) WCS

Question 76

Often a part has a unique shape and needs precise location along with a highly secure clamping system, for which a custom ____ can be used.

A) fixture
B) lathe
C) chuck
D) vise

Question 77

When spot or center drilling, counterboring, or countersinking, it is often desirable to have the cutting tool ____ after it reaches full depth to relieve tool pressure or provide a consistent machined surface.

A) tap
B) can
C) dwell
D) toggle

Question 78

The ____ is used for the machine's own reference purposes and helps it to keep track of how far each axis can move before it runs out of travel.

A) WCS
B) MCS
C) MCU
D) MDI

Question 79

Two M-codes can be used to cause a ____.

A) tool change
B) dwell
C) rigid tap
D) program stop

Question 80

A G83 is for the ____ drilling cycle and fully retracts the tool from the hole between pecks.

A) rigid tap
B) peck
C) deep-hole
D) fast-peck