From Drawing to CNC Program

The journey from an engineering drawing to a running CNC machining program involves multiple steps, each requiring specific skills and tools. Understanding the complete workflow helps identify where time is lost, where errors are introduced, and where software can help.

Step 1 — Read the Drawing

Before touching any software, read the complete engineering drawing. Identify:

• All geometry types — straight edges, arcs, circles, tangent transitions
• All dimensions and tolerances
• Surface finish requirements
• Material specification
• Any special notes or requirements

Planning the construction sequence before starting saves time and prevents errors. Identify which geometry to create first, which operators to use, and which dimensions to verify.

Step 2 — Create the 2D Geometry

Create the 2D geometry that defines the component profile. In XyzPilot, this means:

• Creating construction points at key locations
• Building lines, arcs, and circles from the drawing dimensions
• Using intersection and tangency operators to locate geometry precisely
• Applying fillets and chamfers at corners

The geometry is created analytically — every result is exact. No manual coordinate calculation required.

Step 3 — Verify the Geometry

Before proceeding to CAM, verify every critical dimension using the Measure tools:

• Measure → Distance for linear dimensions
• Measure → Radius/Diameter for circular features
• Measure → Entity Info for arc centres, angles, and sweep

Verification at this stage is fast and catches errors before they reach the machine.

Step 4 — Define CAM Features

Select the geometry profiles and define the machining operations:

• Select the profile for each operation (contour, pocket, drilling)
• Specify the tool — diameter, type, material
• Set the depths — Z start, Z end, step-down
• Define the machining strategy — climb or conventional, direction

Step 5 — Generate the Machining Program

Generate the G-code program from the CAM setup. XyzPilot produces correct G-code with:

• Correct cyclic rotation for closed contours — the program starts at the lead-in point
• Correct cutter compensation — G41/G42 engagement and G40 cancellation
• Correct drill cycles — G81/G83 for drilling operations

Step 6 — Simulate and Verify

Run the Toolpath Simulator to verify the program before machining:

• Verify the cutter follows the correct profile
• Check for collisions or unexpected movements
• Confirm depths and directions are correct

Never skip simulation. A 30-second simulation can prevent a scrapped component and a damaged cutter.

Step 7 — Set Up the Machine and Prove Out

Set up the CNC machine and prove out the program:

• Fit the correct tools and measure tool lengths
• Set the work offset (G54/G55) correctly
• Run the program at reduced feed rate for the first component
• Measure the first component before full production