Work offset setup (G54-G59) in CNC Programming - Mini Project: Build & Apply

Work offset setup (G54-G59)

📖 Scenario: You are programming a CNC machine that needs to work on multiple parts placed on the machine table. Each part is positioned differently, so you need to set up different work offsets to tell the machine where each part's zero point is.

🎯 Goal: Create a CNC program that sets up work offsets G54 to G59 with specific X, Y, Z coordinates for each offset. Then, select each work offset and display its coordinates.

📋 What You'll Learn

Create variables for work offsets G54 to G59 with given X, Y, Z coordinates

Create a variable called current_offset to hold the selected work offset

Write code to select each work offset from G54 to G59 and assign its coordinates to current_offset

Print the selected work offset name and its X, Y, Z coordinates

💡 Why This Matters

🌍 Real World

CNC machines use work offsets to know where each part is placed on the machine table. Setting these offsets correctly allows the machine to cut or drill in the right place without moving the part physically.

💼 Career

Understanding and programming work offsets is essential for CNC programmers and machinists to ensure precise machining and efficient setup of multiple parts.

1

Create work offset variables G54 to G59

Create six dictionaries named G54, G55, G56, G57, G58, and G59. Each dictionary should have keys 'X', 'Y', and 'Z' with these exact values:
G54 = {'X': 10, 'Y': 20, 'Z': 0}
G55 = {'X': 30, 'Y': 40, 'Z': 5}
G56 = {'X': 50, 'Y': 60, 'Z': 10}
G57 = {'X': 70, 'Y': 80, 'Z': 15}
G58 = {'X': 90, 'Y': 100, 'Z': 20}
G59 = {'X': 110, 'Y': 120, 'Z': 25}

CNC Programming

# Create work offset dictionaries G54 to G59 with given coordinates
# Your code here

Hint

Use dictionary syntax with keys 'X', 'Y', and 'Z' and assign the exact values for each work offset.

2

Create a variable for the current work offset

Create a variable called current_offset and set it to None to start. This variable will hold the selected work offset's coordinates.

CNC Programming

G54 = {'X': 10, 'Y': 20, 'Z': 0}
G55 = {'X': 30, 'Y': 40, 'Z': 5}
G56 = {'X': 50, 'Y': 60, 'Z': 10}
G57 = {'X': 70, 'Y': 80, 'Z': 15}
G58 = {'X': 90, 'Y': 100, 'Z': 20}
G59 = {'X': 110, 'Y': 120, 'Z': 25}

# Create a variable called current_offset and set it to None
# Your code here

Hint

Just assign None to current_offset to start.

3

Select each work offset and assign to current_offset

Write a for loop that iterates over the list ['G54', 'G55', 'G56', 'G57', 'G58', 'G59']. Inside the loop, use match-case to assign the corresponding dictionary (G54, G55, etc.) to current_offset based on the loop variable.

CNC Programming

G54 = {'X': 10, 'Y': 20, 'Z': 0}
G55 = {'X': 30, 'Y': 40, 'Z': 5}
G56 = {'X': 50, 'Y': 60, 'Z': 10}
G57 = {'X': 70, 'Y': 80, 'Z': 15}
G58 = {'X': 90, 'Y': 100, 'Z': 20}
G59 = {'X': 110, 'Y': 120, 'Z': 25}

current_offset = None

# Use a for loop and match-case to assign current_offset
# Your code here

Hint

Use a for loop over the list of offset names and a match-case statement to assign the correct dictionary to current_offset.

4

Print the selected work offset and its coordinates

Inside the for loop, add a print statement that shows the selected work offset name and its X, Y, Z coordinates in this exact format:
Selected offset G54: X=10, Y=20, Z=0
Use f-strings and the variables offset_name and current_offset.

CNC Programming

G54 = {'X': 10, 'Y': 20, 'Z': 0}
G55 = {'X': 30, 'Y': 40, 'Z': 5}
G56 = {'X': 50, 'Y': 60, 'Z': 10}
G57 = {'X': 70, 'Y': 80, 'Z': 15}
G58 = {'X': 90, 'Y': 100, 'Z': 20}
G59 = {'X': 110, 'Y': 120, 'Z': 25}

current_offset = None

for offset_name in ['G54', 'G55', 'G56', 'G57', 'G58', 'G59']:
    match offset_name:
        case 'G54':
            current_offset = G54
        case 'G55':
            current_offset = G55
        case 'G56':
            current_offset = G56
        case 'G57':
            current_offset = G57
        case 'G58':
            current_offset = G58
        case 'G59':
            current_offset = G59
    # Print the selected offset and coordinates here
    # Your code here

Hint

Use print(f"Selected offset {offset_name}: X={current_offset['X']}, Y={current_offset['Y']}, Z={current_offset['Z']}") inside the loop.