CNC Programming: Absolute and Incremental Systems

This video tutorial covers the basics of CNC programming, focusing on the absolute and incremental positioning systems. It explains the differences between these systems, with absolute positioning using a fixed zero point and incremental positioning using the last point as zero. The tutorial includes practical examples and exercises to reinforce understanding, concluding with a summary of key concepts.

What are the two types of positioning systems discussed in CNC programming?

• Incremental and Relative

• Linear and Circular

• Absolute and Incremental

• Absolute and Relative

In the Absolute positioning system, how is the zero point determined?

• It changes with each movement

• It is fixed at the start of the program

• It is determined by the operator

• It is calculated automatically

What is the G-code used for Absolute positioning in CNC programming?

• G90

• G93

• G92

• G91

In the Incremental positioning system, what serves as the zero point?

• The last point reached

• The initial start point

• A user-defined point

• The midpoint of the tool path

What is the G-code used for Incremental positioning in CNC programming?

• G90

• G91

• G93

• G92

How does the Absolute system differ from the Incremental system?

• Absolute uses a fixed zero point, Incremental uses the last point as zero

• Both use the same zero point

• Incremental uses a fixed zero point, Absolute uses the last point as zero

• Both change zero points randomly

In an Absolute system, if the tool moves from point A (40mm) to point B (60mm), what is the X value?

• 40

• 100

• 20

• 60

In an Incremental system, if the tool moves from point A (40mm) to point B (20mm), what is the X value?

• 20

• 0

• 40

• 60

What is the X value when moving from point 2 to point 3 in the Incremental system?

• 3

• 2

• 0

• 1

In the practice problems, what is the Z value when moving to point 5 in the Absolute system?

• 5

• 0

• 2

• 6