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Plane Selection: G17 XY Plane / G18 XZ Plane / G19 YZ Plane

In a VMC much of what is programmed is in G17, which is XY, like drawing on a paper on a table. Curves are plotted with X and Y coordinates. But if yu want to sweep on to a part for a facing operation, you might use an arc in G18, using a X and Z coordinate. Likewise, cutter compensation can be applied in different planes, especially if you're using a right angled tool holder. In some cases, some controls will even allow drilling cycles in XZ or YZ planes.

Lathes use G18 because X and Z are the axes doing the most work... I could go on, but other matters are pressing...
 
In a VMC much of what is programmed is in G17, which is XY, like drawing on a paper on a table. Curves are plotted with X and Y coordinates. But if yu want to sweep on to a part for a facing operation, you might use an arc in G18, using a X and Z coordinate. Likewise, cutter compensation can be applied in different planes, especially if you're using a right angled tool holder. In some cases, some controls will even allow drilling cycles in XZ or YZ planes.

Lathes use G18 because X and Z are the axes doing the most work... I could go on, but other matters are pressing...
Thank you sir
 
Your arcs and canned cycles must coincide with the proper plane selection otherwise you get alarm or bad motion. Haas live tool lathe training manual has an easy illustration of when to use what.
 








 
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