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An air pass is a way to check that your milling file behaves the way you intended by executing the file in air before cutting into your material. It is extremely important that you always perform an air pass before milling actual material.

Performing an air pass before milling actual material will help you prevent problems like cutting your clamps, cutting material in the wrong location, and moving too fast or too slow.

To safely run an air pass, you follow all the steps you'd normally follow to mill a file, but you intentionally set your Z User Home too high. We also show you another way to run an air pass without resetting your Z User Home in our CNC Milling manual.

With either method, make sure that the space you leave between your bit and the milling material is greater than the deepest cut your file will make.

When running an air pass, keep the e-stop near you and pay close attention. Even the best machinists perform air passes with their hand on the e-stop.

After running an air pass, always remember to reset the Z User Home back to your material surface before executing your file.

BoXZY must be at 0, 0, 0 before starting your file. If you move any axis for any reason after setting your User Home, use G1 X0 Y0 Z0 to return to it.