Depth of cut and step-over in CNC Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is depth of cut in CNC machining?

Depth of cut is the thickness of the material layer removed in one pass of the cutting tool. It controls how deep the tool cuts into the workpiece.

beginner

Define step-over in CNC machining.

Step-over is the sideways distance the cutting tool moves between passes. It affects the surface finish and machining time.

intermediate

How does increasing the depth of cut affect machining?

Increasing depth of cut removes more material per pass, speeding up machining but increasing tool load and risk of tool wear or breakage.

intermediate

What happens if the step-over is too large?

If step-over is too large, the tool may miss some material between passes, causing a rough surface and poor finish.

advanced

Why is balancing depth of cut and step-over important?

Balancing them ensures efficient material removal, good surface finish, and longer tool life by avoiding excessive load or missed areas.

What does depth of cut control in CNC machining?

A The type of cutting tool used

B The speed of the spindle

C The sideways movement between passes

D How deep the tool cuts into the material

Depth of cut controls how deep the tool cuts into the workpiece material.

Step-over affects which of the following?

A Spindle speed

B Tool diameter

C Surface finish and machining time

D Material hardness

Step-over is the sideways distance between passes and affects surface finish and machining time.

What is a risk of increasing depth of cut too much?

A Tool wear or breakage

B Slower machining

C Better surface finish

D Reduced material removal

Too deep a cut increases tool load, risking wear or breakage.

If step-over is too small, what happens?

A Longer machining time with smoother finish

B Rough surface finish

C Tool breakage

D Material not cut

Small step-over means more passes, longer time, but smoother finish.

Why balance depth of cut and step-over?

A To change tool type

B To optimize efficiency and tool life

C To increase spindle speed

D To reduce coolant use

Balancing them optimizes material removal, surface finish, and tool life.

Explain what depth of cut and step-over mean in CNC machining and why they matter.

Think about how the tool moves in and across the material.

Describe the effects of choosing too large or too small values for depth of cut and step-over.

Consider the balance between speed and quality.