In-process measurement in CNC Programming - Mini Project: Build & Apply

In-process Measurement Automation in CNC Programming

📖 Scenario: You are working with a CNC machine that needs to measure the diameter of a part during the machining process. This helps ensure the part is within the correct size before finishing.We will write a simple CNC program script that simulates in-process measurement by storing measurement data, setting a tolerance limit, checking measurements, and outputting the result.

🎯 Goal: Build a CNC program script that stores measurement values, sets a tolerance limit, checks if measurements are within tolerance, and outputs the measurement status.

📋 What You'll Learn

Create a variable called measurements with exact values: 49.8, 50.1, 50.0, 49.9

Create a variable called tolerance set to 0.2

Use a for loop with variable value to check each measurement against the tolerance

Print the status for each measurement as 'Measurement X: OK' or 'Measurement X: Out of tolerance' where X is the measurement number starting from 1

💡 Why This Matters

🌍 Real World

In-process measurement helps CNC operators check parts during machining to avoid errors and reduce waste.

💼 Career

Understanding how to automate measurement checks is useful for CNC programmers and manufacturing engineers to improve quality control.

1

Create the measurement data

Create a variable called measurements and assign it the list with these exact values: 49.8, 50.1, 50.0, 49.9

CNC Programming

# Create the measurements list with exact values
# Your code here

Need a hint?

Use square brackets to create a list and separate values with commas.

2

Set the tolerance limit

Create a variable called tolerance and set it to the exact value 0.2

CNC Programming

measurements = [49.8, 50.1, 50.0, 49.9]
# Set the tolerance value
# Your code here

Need a hint?

Use a simple assignment to create the tolerance variable.

3

Check measurements against tolerance

Use a for loop with variable value and an index variable i starting from 1 to check each measurement in measurements. Inside the loop, check if the absolute difference between value and 50.0 is less than or equal to tolerance.

CNC Programming

measurements = [49.8, 50.1, 50.0, 49.9]
tolerance = 0.2
# Loop through measurements and check tolerance
# Your code here

Need a hint?

Use enumerate to get both index and value starting at 1.

Use abs() to get the absolute difference.

4

Print the measurement status

Inside the for loop, print the message exactly as Measurement X: OK or Measurement X: Out of tolerance where X is the measurement number from i and the status is from the variable status.

CNC Programming

measurements = [49.8, 50.1, 50.0, 49.9]
tolerance = 0.2
for i, value in enumerate(measurements, start=1):
    if abs(value - 50.0) <= tolerance:
        status = 'OK'
    else:
        status = 'Out of tolerance'
    # Print the measurement status
    # Your code here

Need a hint?

Use an f-string to format the print message with i and status.