CNC Flashcards
Work pieces made by EDM are submerged in what?
Dielectric Fluid
Where are the CNC programs created and stored?
The Machine Control Unit (MCU)
Which quadrant of the coordinate plane is positive in the Y axis and negative in the X axis?
2
Which quadrant of the coordinate plane is negative in both the X and Y axis?
3
What code causes the cutter to move directly to the specified coordinates without cutting?
G00
What code would move a cutter from Point A to Point B through a clockwise curve?
G02
What code would move a cutter from Point A to Point B through a counterclockwise curve?
G03
What is the difference between G00 and G01?
G00 moves the cutter as fast as the machine will allow, G01 requires a Feed Rate for cutting
How would you specify a clockwise curve with a radius of 8, traveling at less than half a circle at 500 inches per minute?
G02 R8 F500
How would you specify a counterclockwise curve with a radius of 6, traveling at more than half a circle at 300 inches per minute?
G03 R-6 F300
Point A is X5, Y0, Point B is X5, Y5. Feed Rate is 700 inches per minute. Rank all 5 methods of cutting from point A to point B from lowest to highest X value, using N in place of the radius.
- G02 Y5 R-N F700
- G02 Y5 RN F700
- G01 Y5 F700
- G03 Y5 RN F700
- G03 Y5 R-N F700
What function does a CNC machine do when prompted with an N-Code?
None. N-codes are for the user to identify which set of instructions they are looking at, and are ignored by the program.
What is a “Dog Leg”?
In a G00, the machine reaches one axis of its destination before it reaches the others.
How do you calculate Inches Per Minute for a Spot Drill or Split Point Drill?
Rotations per Minute x Inches per Revolution = Inches per Minute
How are Inches per Revolution calculated?
Diameter of cutting tool / 0.0625 x 0.001
How are rotations per minute calculated for aluminum?
3.82 x 300 / diameter of cutting tool
How are inches per minute calculated for an end mill?
Rotations per Minute x Number of Flutes x Chip Load
Define the following set of commands:
N05 G00 X0 Y0
N10 G01 X1 Y8 F500
Step 1: Set point A to 0,0
Step 2: At 500 inches per minute, proceed in a straight line to point B at 1,8
Define the function of M30
End the program and reset to starting point
What is G54 used for?
Defining the 0 point