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6th axis

A 6th axis is usually part of CNC-machining centres or milling machines, which already have 5 axis which for different reasons are insufficient.

Problem: Theoretically with a milling spindle with 5 axes, every point within the working range in every arbitrary angle can be reached.

Therefore 5 axis are sufficient in order to mill every arbitrary workpiece.

But it would mean a relatively big effort or it'd be practically impossible, to process a workpiece from the bottom as it has to be stretched.

This problem often occurs during chair production where parts have to be processed three-dimensionally from all sides.

Mostly the solution is the workpiece, similar to the lathe, clamped between two peaks and is CNC-controlled via a lathe and can be pivoted during the process.

In the shape construction CNC-controlled pivoting tables are partially used. The purpose of it is that even big workpieces can be processed with a relatively small working range of milling spindles.