Bridgeport did sell a factory 4th axis option. It even came with a disk to update the parameters to enable it. The control is pre-wired for it (well some what).
If you purchase an aftermarket unit, make sure it has a Siemens motor and drive and the correct plug and cable.
George
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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