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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
What is G86 for milling?
- Standard boring cycle ( G86 G99 Z-0.54 R0.1 F4.5 )
26
What is G89?
- Counter-boring cycle | ( G89 G99 Z-0.375 P0 )
27
What type of tap holder is required on older machines?
- Special Tension/Compression tap holder
28
What is rigid tapping and what are the advantages?
- Allow perfect synchronization between spindle reversal at hold bottom and Z-axis motion.
29
How are G86 and G76 different?
- G86 ( Standard Boring mill ) Leaves drag-line mark - G76 ( Fine Boring mill ) Leaves no marks
30
What is the difference between G85 ( Reaming ) and G81 ( Drilling ) ?
- G85 = Feeds to bottom of hole and retracts at the same feed-rate - G81 = Standard drilling cycle for reaming to save time
31
Explain the difference between the Initial Plane and the R Plane.
- ( G99 ) = R-plane, Position just above work surface - ( G98 ) = Initial-plane, Above obstruction in Z-Axis
32
To avoid clamps and other obstructions with the Initial and the R plane specify G99 for ___ plane and G98 for the ___ plane.
( G99 ) R-plane / ( G98 ) Initial plane
33
The G code used to instate the Polar Co-ordinate system mode is.
- G16 - G15 ( Cancels )
34
When using polar co-ordinates the letters X and Y specify:
- X specifies radial co-ordinates - Y specifies angular co-ordinates
35
The G code used to specify a temporary shift of the program zero is.
- G52
36
What is M97?
- Local sub-routine call
37
What is M98?
- Invoke sub-program
38
What is M99?
- End of sub-program
39
What are the 2 benefits of using sub-programs?
- Series of commands can be repeated when machining holes. - Simplifies programming for manual programmers.
40
What word has to be included in a program to allow all hole locations to be specified within a sub-program?
- The L word
41
What is the difference between Polar co-ordinates and Co-ordinate rotation?
- ***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
Explain the term Helical Interpolation.
- Combination of linear and circular interpolation. X and Y-axis moves along a circular path while the Z-axis moves linearly.
43
Name two ( 2 ) types of rotary devices.
- Indexer - Rotary axis
44
What is Limits of Size?
- Actual upper and lower limit of size.
45
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
d) Attribute Data
46
What materials are gauge blocks made from?
- **Hardened steel** - **Carbide** ( Expensive, wears less faster ) - **Ceramic** ( Expensive, wears less faster )
47
Why would we use wear blocks in a gauge block set-up if we purchased them?
- To prevent corrosion on the contact face - Placed on either ends to protect blocks from damage and abrasion
48
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
c) G82
49
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
b) G81
50
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
f) G73
51
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
d) G83
52
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
e) G84

AIT 2019 QH-V2 (7 decks)

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