Powermill | Macro

A macro that aggregates all active toolpaths, sets the NC program number (+1 increment), applies your post-processor of choice, outputs the .nc file to a dated folder, and generates a print-out setup sheet.

Autodesk doesn’t publish a complete macro command dictionary (frustrating, I know). But here’s the workaround:

Also, download the PowerMILL Command Reference (PDF). It’s old but still 90% accurate for macro syntax. powermill macro

Let’s build a macro that automates the safe setup of a new job. Open Notepad++ (or the built-in PowerMill Editor) and follow along.

Step 1: The Header (Safety checks) Always start with clearing the slate to avoid variable conflicts. A macro that aggregates all active toolpaths, sets

// Stop on un-recoverable errors
MACRO ABORT ON
// Clear the session (Optional: Use with caution)
DELETE TOOLPATH ALL
DELETE TOOL ALL
DELETE MODEL ALL

Step 2: User Input (Parameters) Hard-coded macros are brittle. Use INPUT or QUERY to ask the user for variables.

STRING tool_diameter = INPUT "Enter Tool Diameter"
STRING stock_height = INPUT "Enter Stock Z Height"

Step 3: The Logic Now, execute the commands using the variables. Also, download the PowerMILL Command Reference (PDF)

CREATE TOOL "Endmill" dia $tool_diameter  // The $ recalls the variable
ACTIVATE TOOL "Endmill"
CREATE STOCK BOX
EDIT STOCK BOX LIMITS -10 -10 0 10 10 $stock_height

Step 4: Save and Run Save the file as Setup_Macro.mac. In PowerMill, go to Macro > Play or drag and drop the file into the graphics window.

Let’s start with a practical scenario: You want to create a 10mm end mill, set its speed to 8000 RPM, and feed to 1500 mm/min.