Drill File CAM Configuration

Table of Contents

Our service cannot process Altium’s Drill Drawing (DD1) or Drill Guide (GG1) files. We need the drill file to be in NC Drills format file. Altium typically generates these with a .TXT extension.

Altium has published a guide on producing those files here: http://wiki.altium.com/display/ADOH/NC+Drill+Output+Options

The drill format options we use are as follows:

  • We prefer a 2:4 format when using Inches, or a 3:3 when using Millimeters. Some versions of Altium do not have these options, so you should use 3:4 in Inches, or 4:4 in Metric, and verify that the drill hits align correctly on the previews.

  • Check Keep Leading And Trailing Zeroes

  • Generate Seperate NC Drill files may be checked or unchecked. We will merge drill files automatically.

  • Use Drilled Slot Command may be checked if you wish to include in your design. See our slots page for noted restrictions on using drill slots.

  • Uncheck Generate Board Edge Route Paths. We do not use provided edge-milling paths, and including them may have unexpected results if they’re used for manufacturing.

  • For Coordinate Positions”, you’ll typically check Reference to Absolute Origin. However, since this option needs to align with a similar CAM setting for the gerber files, consider changing it to Reference to Relative Origin if your gerbers appear incorrect in our previews.

  • Optimize Change Location Commands doesn’t matter, as we will recalculate drill movement.

In some cases, including the binary .DRL file will cause us to reject the board even if you have a .TXT file in NC Drill format. Deleting the .DRL file will resolve that issue.


The following image shows a properly aligned drill file, and should resemble your previews when uploading your board. If anything looks strange, consult our Drill Troubleshooting Guide for some tips or email [email protected] for assistance.

Correctly Aligned Drills