Depth of cut and step-over in CNC Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the depth of cut to 2 mm.

CNC Programming

depth_of_cut = [1]  # in millimeters

Drag options to blanks, or click blank then click option'

A2

B0.5

C5

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a value too large or too small for typical depth of cut.

Confusing depth of cut with step-over.

The depth of cut is set to 2 mm by assigning the value 2 to the variable depth_of_cut.

2fill in blank

medium

Complete the code to set the step-over to 40% of the tool diameter.

CNC Programming

step_over = tool_diameter * [1]  # step-over as fraction

Drag options to blanks, or click blank then click option'

A0.5

B0.4

C0.25

D0.75

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0.4 as 4 instead of 0.4.

Confusing step-over with depth of cut.

Step-over is set to 40% of the tool diameter by multiplying tool_diameter by 0.4.

3fill in blank

hard

Fix the error in the code to calculate the number of passes needed for a given total depth and depth of cut.

CNC Programming

passes = int(total_depth / [1] + 0.999)  # round up to next whole pass

Drag options to blanks, or click blank then click option'

Adepth_of_cut

Bfeed_rate

Ctool_diameter

Dstep_over

Attempts:

3 left

💡 Hint

Common Mistakes

Using step-over instead of depth of cut in the division.

Using feed rate or tool diameter incorrectly.

The number of passes depends on dividing the total depth by the depth of cut, not step-over or other values.

4fill in blank

hard

Fill both blanks to create a dictionary showing passes and step-over in mm for a tool diameter of 10 mm and depth of cut 2 mm.

CNC Programming

settings = {'passes': int(total_depth / [1] + 0.999), 'step_over_mm': [2] * tool_diameter}

Drag options to blanks, or click blank then click option'

Adepth_of_cut

B0.4

C0.5

Dstep_over

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up step-over and depth of cut in calculations.

Using 0.5 instead of 0.4 for step-over.

The number of passes is calculated using depth_of_cut. Step-over in mm is 40% (0.4) times the tool diameter.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps tool names to their step-over in mm, only if step-over is less than 5 mm.

CNC Programming

step_overs = {name: diameter * [1] for name, diameter in tools.items() if diameter * [2] [3] 5}

Drag options to blanks, or click blank then click option'

A0.4

C<

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using different fractions for calculation and condition.

Using > instead of < in the condition.

The step-over fraction is 0.4. The condition filters tools where step-over is less than 5 mm, so the operator is <.