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5 Axes Table-Table (TT)
These machines have two rotary axes on the table, one mounted on top of the other. The head is fixed, typically (but not necessarily) at the Z axis orientation. On table-table machines, the part, which is mounted on the table, rotates and moves with each axis rotation (hence, the procedure origin UCS rotates and moves as well). The spindle and tool remain stationary, and are not affected by axis rotation.
We term the first axis (mounted on the floor) the primary (or alpha) axis, and the other axis (mounted on top of the first) the secondary (or beta) axis. Note that rotation of the alpha axis affects the position and direction of the beta axis.
The following diagrams illustrate several table-table machines. The alpha axis is shown in green, whereas the beta axis (the table) is shown in blue.
- Alpha axis X, Beta axis Z, Vertical Tool
- Alpha axis Z, Beta axis X, Horizontal Tool
- Alpha axis Z,-Y (45 degrees), Beta axis Z, Vertical Tool
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