What is tramming?

Newbie here getting into the new languages associated with CNC.

“What is tramming the spindle?”

Tramming is the process of making the spindle perpendicular to the wasteboard on both axes of rotation.
Basically you want your endmill to cut like this:

Not like this:

Image source



One more info graphic about what tram is…

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I figured it was something along those lines. None of the experts on YT mention even facing the work surface.

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Makes sense now. Thanks.

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