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Industrial Electronics > CNC > Flashcards

CNC Flashcards

1
Q

a method for automating the control of machine tools through the use of software embedded in a microcomputer attached to the tool.

A

Computer numerical control (CNC)

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2
Q

international standard language

A

G-code

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3
Q

were built in the 1940s and 1950s by Prof. John T. Parson

A

NC machines

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4
Q

a method of automatically operating a manufacturing machine based on a code of letters, numbers and special characters.

A

Numerical Control

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5
Q

converts written instruction into a corresponding hole pattern.

A

Tape punch

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6
Q

reads the hole pattern on the tape and converts the pattern to corresponding electrical signal code.

A

Tape reader

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7
Q

receives the electrical signal code from the tape reader and subsequently causes the NC machine to respond.

A

Controller

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8
Q

responds to programmed signals from the controller.

A

NC machine

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9
Q

It is a NC machine with the added feature of an onboard computer. The onboard computer is often referred to as the Machine Control Unit (MCU).

A

Computer Numerical Control

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10
Q

generates, stores and processes CNC programs.

A

Machine Control Unit

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11
Q

responds to programmed signals from the MCU and manufacture the part

A

NC machine

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12
Q

An alphanumeric character or punctuation marks

A

Programming Character

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13
Q

A letter that describes the meaning of numerical value following the address

A

Addresses

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14
Q

Composed of an address and a number

A

Word

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15
Q

Is a complete line of information to a CNC machine.

A

Blocks

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16
Q

Is a sequence of blocks that describe in detail the motions a CNC machine is to execute in order top manufacture a part. The MCU execute the program block by block.

A

Programs

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17
Q

Different types of system control

A

Fanuc
Allen-Bradley
GE
Okuma
Bendix
Mazak
Others

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18
Q

They cause the tool to move to a point on the part and execute an operation at that point only.

A

Point-to-point control movement

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19
Q

They cause the tool to maintain continuous contact with the part as the tool cut contour shape.

A

Continuous path tool movement

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20
Q

Is a mathematical method of approximating the true or exact position required to follow a pre-calculated path.

A

Interpolation

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21
Q

send electrical signals to drive motor controllers and receives some form of electrical feedback from the motor controllers.

A

loop system

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22
Q

utilizes stepping motors to create machine movements

A

open loop system

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23
Q

Special motor called servos are used for executing machine movements in __________

A

Closed Loop System

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24
Q

All ballscrews have some “slop” or _________ at assembly that causes errors when the screws reverses direction and the nuts lag behind.

A

Backlash

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25
Q

The location of CNC tool at any time is controlled by a XYZ coordinates

A

Cartesian Coordinates

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26
Q

executes machining operations by performing some form of sliding linear motion and rotary motion.

A

CNC equipment

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27
Q

EIA RS-267A standard

A
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28
Q

Right Hand Rule for Linear Motion

A
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29
Q

locate each new tool position by measuring from the last tool position established. if one ____________ movement is in error, all subsequent movements will be incorrect.

A

Incremental Positioning

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30
Q

is a machine tool used principally for shaping articles of metal (and sometimes wood or other materials) by causing the workpiece to be held and rotated by the lathe while a tool bit is advanced into the work causing the cutting action.

A

Lathe Machine

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31
Q

– are large lathe and is usually floor mounted. It can handle more machining jobs

A

Engine Lathes

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32
Q

are usually used in production or job shops for mass production and specialized parts.

A

Turret Lathes and Special Purpose Lathe

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33
Q

is the foundation of the working parts of the lathe to another

A

bed

34
Q

is located on the operator’s left end of the lathe bed. It contains the main spindle and oil reservoir and the gearing mechanism

A

headstock

35
Q

mounted on bearings in the headstock and is hardened and specially ground to fit different lathe holding devices.

A

main spindle

36
Q

may be inserted into the spindle.

A

Centers, collets, drill chucks, tapered shank drills and reamers

37
Q

may be screwed onto the spindle or clamped onto the spindle nose.

A

Chucks, drive plates, and faceplates

38
Q

located on the opposite end of the lathe from the headstock

A

tailstock

39
Q

includes the apron, saddle, compound rest, cross slide, tool post, and the cutting tool.

A

carriage

40
Q

carries the cross slide and the compound rest.

A

saddle

41
Q

mounted on the cross slide and can be swiveled and clamped at any angle in a horizontal plane.

A

compound rest

42
Q

are secured in the tool post which is mounted directly to the compound rest

A

cutting tool and tool holder

43
Q

mounted on the dovetail ways on the top of the saddle and is moved back and forth at 90° to the axis

A

cross slide

44
Q

contains the gears and feed clutches which transmit motion from the feed rod or lead screw to the carriage and cross slide

A

apron

45
Q

has a radius ground onto the nose of the tool bit that is smaller than the radius for a finishing

A

roughing tool

46
Q

is shaped to be fed from right to left.

A

right-hand turning tool bit

47
Q

is the opposite of the right-hand designed to cut when fed from left to right

A

left-hand turning tool bit

48
Q

very versatile and can be used to turn in either direction for roughing and finishing cuts.

A

round-nose turning tool bit

49
Q

is machining the ends and shoulders of a piece of stock smooth.

A

Facing

50
Q

sometimes called cylindrical turning, is the process of reducing the work diameter to a specific dimension

A

Straight Turning

51
Q

are machined to add strength for parts that are to be fitted together, make a corner, or improve the appearance of a part.

A

Shoulders

52
Q

to add to the general appearance of the work. Common types of corners are chamfered, rounded, and square

A

Corners

53
Q

Undercuts are the reductions in diameter machined onto the center portion of workplaces

A

Undercuts

54
Q

(or necking) is the process of turning a groove or furrow on a cylinder, shaft, or workpiece.

A

Grooving

55
Q

the process of machining radii and these irregular shapes.

A

Form turning

56
Q

When the diameter of a piece changes uniformly from one end to the other, the piece is said to be tapered.

A

TAPER TURNING

57
Q

is a uniform helical groove cut inside of a cylindrical workpiece, or on the outside of a tube or shaft.

A

SCREW THREAD CUTTING
(thread)

58
Q

is a process of impressing a diamond shaped or straight line pattern into the surface of a workpiece by using The diamond

A

Knurling

59
Q

is the enlarging and truing of a hole by removing material from internal surfaces with a single-point cutter bit

A

Boring

60
Q

sometimes called channeling or cambering, is the process of cutting a groove inside of a drilled, bored, or reamed hole.

A

RECESSING

61
Q

The address code G90 in a program

A

absolute mode.

62
Q

The code G91

A

incremental mode.

63
Q

The most common codes used when programming CNC machines tools are

A

G-codes (preparatory functions), and M codes (miscellaneous functions).

64
Q

sometimes called cycle codes because they refer to some action occurring on the X, Y, and/or Z axis of a machine tool

A

G-codes

65
Q

, containing codes G00, G01, G02, G03,

A

Group 1

66
Q

includes either absolute or incremental programming

A

Group 3

67
Q

deals with canned cycles.

A

Group 09

68
Q

The _____ ______ ______ move the axes at a controlled feedrate.

A

G01, G02, and G03 codes

69
Q

codes are used to either turn ON or OFF different functions which control certain machine tool operations, figure below.

A

M or miscellaneous codes

70
Q

M-codes are not grouped into categories, although several codes may control the same type of operations such as

A

M03 turns the spindle on clockwise
* M04 turns the spindle on counterclockwise
* M05 turns the spindle off

71
Q

machine tool that removes metal as the work is fed against a rotating multipoint cutter.

A

milling machine

72
Q

rotates at high speed and it removes metal at a very fast rate with the help of multiple cutting edges.

A

milling cutter

73
Q

Once or more number of cutters can be mounted simultaneously on the

A

arbor

74
Q

Classification of Milling Machine

A

According to the nature of purpose of use

According to the orientation of the spindle

According to configuration and motion of the work holding table/bed

According to automation and production rate

75
Q

Machining flat surfaces which are at right angles to the axis of the cutter,

A

Face milling.

76
Q

Machining flat surfaces which are at an inclination to the axis of the cutter.

A

Angular milling

77
Q

Machining surfaces having an irregular outline

A

Form milling

78
Q

Different Milling Operations

A

Surface, slot, dovetail, T-slot, Form, Straddle, Angular, Boring, Drilling

79
Q

Workpiece fed with Milling cutter

A

Climb Milling

80
Q

Workpiece fed against Milling Cutter

A

Conventional Milling

Industrial Electronics (3 decks)

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