Sample Fix Report — Mazak Integrex i-400 / Fusion 360

⚠️ Warnings — Read Before Running

Tool number format: Verify your Integrex tool magazine is configured with matching 4-digit T codes (T0101 = tool 01, offset 01). If you use custom offset numbers, adjust the OO digits in your CAM tool library accordingly before running.
Polar interpolation: Run a C-axis milling dry cycle (single block) to confirm G12.1 activates correctly and G13.1 cancels cleanly before returning to turning operations.

What Changed & Why

Root Cause

Three issues were identified in the Fusion 360 post-processor for the Mazak Integrex i-400 with MAZATROL SmoothX control.

The immediate symptom was an "Undefined Tool" alarm on every tool change — caused by the post outputting 2-digit T codes (T01) where the Integrex controller requires 4-digit TTOO format (T0101). This is a known limitation of the default Fusion 360 Mazak post and is widely reported in the Autodesk Community forums.

What Was Fixed

1. T code format — Changed toolFormat width from 2 to 4. The Integrex tool command format is TTOO — first two digits are the tool slot number, last two digits are the offset register. This resolves the "Undefined Tool" alarm immediately.

2. G12.1 polar interpolation — Removed the isFirstSection() guard so G12.1 is output at the start of every C-axis milling section, not just the first one. Operations after the first milling op were running without polar interpolation active.

3. G13.1 cancel — Added G13.1 to the section end block for milling operations. Without it, polar interpolation stays active across tool changes into turning operations. See MAZATROL SmoothX G-Code Reference §6.4.

How to Verify

Post a program with at least one tool change — confirm no "Undefined Tool" alarm. Post a program with C-axis milling followed by a turning operation — confirm G12.1 / G13.1 appear correctly. Run a dry cycle (single block) to verify transitions execute cleanly.

Changes (3)

Change 1 — Line 43 Issue #1

Before

var toolFormat = createFormat({decimals:0, width:2, zeropad:true});

After

var toolFormat = createFormat({decimals:0, width:4, zeropad:true});

Fusion 360's default Mazak post outputs 2-digit tool numbers (T01, T02). The Mazak Integrex requires 4-digit T codes in the format TTOO where TT = tool number and OO = offset number (e.g. T0101, T0202). Without this fix the controller throws an "Undefined Tool" alarm on every tool call. Confirmed in MAZATROL SmoothX EIA/ISO Programming Manual §3.2 — Tool Command Format. This is a widely reported issue in the Autodesk Community forums for Mazak Integrex users on Fusion 360.

Change 2 — Line 287 Issue #2

Before

if (isFirstSection()) {
  writeBlock(gFormat.format(12.1));
}

After

writeBlock(gFormat.format(12.1));

The post was only outputting G12.1 (polar coordinate interpolation ON) at the start of the first section. On the Integrex, G12.1 must be output at the beginning of every C-axis milling operation because G13.1 (cancel) is issued at section end. Subsequent milling operations were running without polar interpolation active, causing incorrect XY motion on the C-axis.

Change 3 — Line 301 Issue #3

Before

onSectionEnd = function() {
  writeBlock(mFormat.format(9));
  writeBlock(gFormat.format(28), "U0", "W0");
};

After

onSectionEnd = function() {
  if (currentSection.isMultiAxis()
      || isTurningOperation) {
    // no G13.1 needed
  } else {
    writeBlock(gFormat.format(13.1));
  }
  writeBlock(mFormat.format(9));
  writeBlock(gFormat.format(28), "U0", "W0");
};

G13.1 (polar coordinate interpolation cancel) was missing from the section end block for milling operations. Leaving G12.1 active across tool changes causes the controller to apply polar interpolation to subsequent turning operations, resulting in incorrect axis movements and potential collision. G13.1 must be output at the end of every C-axis milling section. See MAZATROL SmoothX G-Code Reference §6.4.

Documentation Referenced

Source	Page	Topic
MAZATROL SmoothX EIA/ISO Programming Manual	47	Tool Command Format (TTOO)
MAZATROL SmoothX G-Code Reference	203	G12.1 / G13.1 Polar Interpolation
Fusion 360 Post Processor Reference — createFormat()	—	toolFormat width parameter
Autodesk Community Forum — Mazak Integrex post revise	—	T code 4-digit format