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AIT 2019 QH-V2 > CNC Assignments > Flashcards

CNC Assignments Flashcards

1
Q

Which style of V-flange tool-holder is most commonly used in North America?

A
  • CAT 40
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2
Q

List two ( 2 ) types of 40 size tapers for machining centers.

A
  • CAT ( Caterpillar )
  • BT
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3
Q

What is the most obvious difference between CAT and BT V-flange tool holders?

A
  • Size of the width V-groove around the flange
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4
Q

What ensures that the tool-holder and cutting tool remain concentric with the spindle in a milling machine?

A
  • Smooth internal tapered surface within spindle engages matching external taper on tool-holder shank
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5
Q

What is the purpose of the dimple in the keyway of a tool-holder?

A
  • Helps with orientation

( Helps with identifying deeper drive slot )

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6
Q

If tool station number 2 is not currently in the spindle, what command must be used to place tool number 2 in the spindle?

A
  • T02 M06
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7
Q

What command makes the spindle rotate to the orient position?

A
  • M19
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8
Q

What codes are used to initiate tool length compensation?

A
  • G43 and an H-word
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9
Q

List 4 available safety functions, used when verifying a program.

A
  • Dry run
  • Single block
  • feed hold
  • distance to go
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10
Q

What feature allow you to ignore milling cutter size when calculating coordinates?

A
  • Cutter radius compensation
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11
Q

Most machining centers require feed rate, feed rate in IPM ( inches per minute). What G-code specifies IPM?

A
  • G94 = Inches per minute ( IPM )
  • G95 = Inches per revolution ( IPR )
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12
Q

What is the preferred positioning method, absolute or incremental?

A
  • Absolute
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13
Q

What G-codes are used to specify Absolute and Incremental positioning?

A
  • Absolute = G90
  • Incremental = G91
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14
Q

When programming an arc using directions vectors, what do the I and J values specify?

A
  • ” I “ specifies X-axis components
  • ” J “ specifies Z-axis components
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15
Q

What are the 3 G-codes related to plane selection?

A
  • G17 = XY plane
  • G18 = XZ plane
  • G19 = YZ plane
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16
Q

List and describe the 2 G-codes used to instate cutter compensation. ( For Milling )

A
  • G41 = cutter on left
  • G42 = cutter on right
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17
Q

What code cancels cutter compensation?

A
  • G40
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18
Q

How does G28 work?

A
  • Zero return command causes two motions to their intermediate points.
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19
Q

What is G80?

A
  • Cancels Canned cycle
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20
Q

What is G81 for milling?

A
  • Standard drilling cycle

( G81 G99 Z-0.375 R0.1 F9. )

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21
Q

What is G73?

( Milling )

A
  • Chip-breaking peck drilling cycle

( G73 G99 Z-2.15 Q0.2 R0.1 F9. )

22
Q

What is G83?

( Milling machines )

A
  • Deep hole peck drilling cycle
23
Q

What is G84?

( Milling machines )

A
  • Right hand tapping cycle

( 7/16 - 14 @ 500 RPM )

( G84 G99 Z-.065 R 0.1 J3 F3.5.7143 )

( J3 = Retract speed )

24
Q

What is G74?

( Milling machines )

A
  • Left hand tapping cycle

( G74 G99 Z-.065 R0.1 J3. F35.7143 )

( J3 = Retract speed )

25
Q

What is G86 for milling?

A
  • Standard boring cycle

( G86 G99 Z-0.54 R0.1 F4.5 )

26
Q

What is G89?

A
  • Counter-boring cycle

( G89 G99 Z-0.375 P0 )

27
Q

What type of tap holder is required on older machines?

A
  • Special Tension/Compression tap holder
28
Q

What is rigid tapping and what are the advantages?

A
  • Allow perfect synchronization between spindle reversal at hold bottom and Z-axis motion.
29
Q

How are G86 and G76 different?

A
  • G86 ( Standard Boring mill ) Leaves drag-line mark
  • G76 ( Fine Boring mill ) Leaves no marks
30
Q

What is the difference between G85 ( Reaming ) and G81 ( Drilling ) ?

A
  • G85 = Feeds to bottom of hole and retracts at the same feed-rate
  • G81 = Standard drilling cycle for reaming to save time
31
Q

Explain the difference between the Initial Plane and the R Plane.

A
  • ( G99 ) = R-plane, Position just above work surface
  • ( G98 ) = Initial-plane, Above obstruction in Z-Axis
32
Q

To avoid clamps and other obstructions with the Initial and the R plane specify G99 for ___ plane and G98 for the ___ plane.

A

( G99 ) R-plane / ( G98 ) Initial plane

33
Q

The G code used to instate the Polar Co-ordinate system mode is.

A
  • G16
  • G15 ( Cancels )
34
Q

When using polar co-ordinates the letters X and Y specify:

A
  • X specifies radial co-ordinates
  • Y specifies angular co-ordinates
35
Q

The G code used to specify a temporary shift of the program zero is.

36
Q

What is M97?

A
  • Local sub-routine call
37
Q

What is M98?

A
  • Invoke sub-program
38
Q

What is M99?

A
  • End of sub-program
39
Q

What are the 2 benefits of using sub-programs?

A
  • Series of commands can be repeated when machining holes.
  • Simplifies programming for manual programmers.
40
Q

What word has to be included in a program to allow all hole locations to be specified within a sub-program?

A
  • The L word
41
Q

What is the difference between Polar co-ordinates and Co-ordinate rotation?

A
  • Polar co-ordinates give you the ability to rotate one coordinate.
  • Coordinate rotation lets you rotate the whole series while maintaining relationships among coordinates.
42
Q

Explain the term Helical Interpolation.

A
  • Combination of linear and circular interpolation. X and Y-axis moves along a circular path while the Z-axis moves linearly.
43
Q

Name two ( 2 ) types of rotary devices.

A
  • Indexer
  • Rotary axis
44
Q

What is Limits of Size?

A
  • Actual upper and lower limit of size.
45
Q

Which of the following types of information does a “ go / no-go gauge “ provide?

a) type of material
b) SPC data
c) variable date
d) Attribute data

A

d) Attribute Data

46
Q

What materials are gauge blocks made from?

A
  • Hardened steel
  • Carbide ( Expensive, wears less faster )
  • Ceramic ( Expensive, wears less faster )
47
Q

Why would we use wear blocks in a gauge block set-up if we purchased them?

A
  • To prevent corrosion on the contact face
  • Placed on either ends to protect blocks from damage and abrasion
48
Q

What G code is used to specify a counter-boring cycle?

( Lathes )

a) G80 b) G81
c) G82 d) G83
e) G84 f) G73
g) G76

49
Q

What G code is used to specify a standard drilling cycle?

a) G80 b) G81
c) G82 d) G83
e) G84 f) G73
g) G76

50
Q

What G code is used to specify a chip-breaking peck drilling cycle?

( Lathes )

a) G80 b) G81
c) G82 d) G83
e) G84 f) G73
g) G76

51
Q

What G code is used to specify a deep-hole peck drilling cycle?

a) G80 b) G81
c) G82 d) G83
e) G84 f) G73
g) G76

52
Q

What G code is used to specify a tapping cycle?

( Milling - machines )

a) G80 b) G81
c) G82 d) G83
e) G84 f) G73
g) G76

AIT 2019 QH-V2 (7 decks)

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