3D surface machining basics in CNC Programming - Mini Project: Build & Apply

3D Surface Machining Basics

📖 Scenario: You are programming a CNC machine to carve a simple 3D surface. The surface is defined by points with X, Y, and Z coordinates. You will create a program that sets up the points, configures a cutting depth limit, calculates which points are safe to cut, and then outputs the safe points for machining.

🎯 Goal: Build a CNC program script that defines a set of 3D points, sets a maximum cutting depth, filters points that are within this depth, and prints the safe points for machining.

📋 What You'll Learn

Create a dictionary called surface_points with exact keys and values for X, Y, Z coordinates.

Create a variable called max_depth with the exact value 5.

Use a dictionary comprehension called safe_points to include only points where Z is less than or equal to max_depth.

Print the safe_points dictionary exactly as shown.

💡 Why This Matters

🌍 Real World

In CNC machining, programmers must define 3D surfaces and decide which areas are safe to cut based on depth limits to avoid damaging the machine or the workpiece.

💼 Career

This project teaches basic scripting skills used in CNC programming to automate surface machining tasks, a common requirement for manufacturing engineers and CNC programmers.

1

Define 3D surface points

Create a dictionary called surface_points with these exact entries: 'P1': (0, 0, 3), 'P2': (1, 0, 7), 'P3': (0, 1, 5), 'P4': (1, 1, 2).

CNC Programming

# Create the dictionary surface_points with given points
# Your code here

Need a hint?

Use curly braces to create a dictionary. Each key is a point name like 'P1'. Each value is a tuple with three numbers for X, Y, and Z.

2

Set maximum cutting depth

Create a variable called max_depth and set it to the integer 5.

CNC Programming

surface_points = {'P1': (0, 0, 3), 'P2': (1, 0, 7), 'P3': (0, 1, 5), 'P4': (1, 1, 2)}
# Create max_depth variable and set to 5
# Your code here

Need a hint?

Just write max_depth = 5 on a new line.

3

Filter safe points to cut

Use a dictionary comprehension called safe_points to include only points from surface_points where the Z coordinate (third value in the tuple) is less than or equal to max_depth.

CNC Programming

surface_points = {'P1': (0, 0, 3), 'P2': (1, 0, 7), 'P3': (0, 1, 5), 'P4': (1, 1, 2)}
max_depth = 5
# Create safe_points dictionary with points where Z <= max_depth
# Your code here

Need a hint?

Use {point: coords for point, coords in surface_points.items() if coords[2] <= max_depth}.

4

Print safe points

Print the safe_points dictionary exactly as it is.

CNC Programming

surface_points = {'P1': (0, 0, 3), 'P2': (1, 0, 7), 'P3': (0, 1, 5), 'P4': (1, 1, 2)}
max_depth = 5
safe_points = {point: coords for point, coords in surface_points.items() if coords[2] <= max_depth}
# Print safe_points dictionary
# Your code here

Need a hint?

Use print(safe_points) to show the filtered points.