CNC Assignments Flashcards
Which style of V-flange tool-holder is most commonly used in North America?
- CAT 40
List two ( 2 ) types of 40 size tapers for machining centers.
- CAT ( Caterpillar )
- BT
What is the most obvious difference between CAT and BT V-flange tool holders?
- Size of the width V-groove around the flange
What ensures that the tool-holder and cutting tool remain concentric with the spindle in a milling machine?
- Smooth internal tapered surface within spindle engages matching external taper on tool-holder shank
What is the purpose of the dimple in the keyway of a tool-holder?
- Helps with orientation
( Helps with identifying deeper drive slot )
If tool station number 2 is not currently in the spindle, what command must be used to place tool number 2 in the spindle?
- T02 M06
What command makes the spindle rotate to the orient position?
- M19
What codes are used to initiate tool length compensation?
- G43 and an H-word
List 4 available safety functions, used when verifying a program.
- Dry run
- Single block
- feed hold
- distance to go
What feature allow you to ignore milling cutter size when calculating coordinates?
- Cutter radius compensation
Most machining centers require feed rate, feed rate in IPM ( inches per minute). What G-code specifies IPM?
- G94 = Inches per minute ( IPM )
- G95 = Inches per revolution ( IPR )
What is the preferred positioning method, absolute or incremental?
- Absolute
What G-codes are used to specify Absolute and Incremental positioning?
- Absolute = G90
- Incremental = G91
When programming an arc using directions vectors, what do the I and J values specify?
- ” I “ specifies X-axis components
- ” J “ specifies Z-axis components
What are the 3 G-codes related to plane selection?
- G17 = XY plane
- G18 = XZ plane
- G19 = YZ plane
List and describe the 2 G-codes used to instate cutter compensation. ( For Milling )
- G41 = cutter on left
- G42 = cutter on right
What code cancels cutter compensation?
- G40
How does G28 work?
- Zero return command causes two motions to their intermediate points.
What is G80?
- Cancels Canned cycle
What is G81 for milling?
- Standard drilling cycle
( G81 G99 Z-0.375 R0.1 F9. )