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Assuming you are talking Heidenhain equipped Bridgeports I think all the controllers from the TNC150 forwards had the capability to add a forth axis. What you may not have is the relevant Bosch servo...

Often Bridge port interacts come with heidenhien controls and Large DC Brushed servos running off Analog amplifiers(drives). These are notoriously temperamental and difficult to setup. They also like...

The older you go on the machine the more likely the controllers will be dated. The machines are very sturdy and capable which really makes them prime material for retrofit to newer controls. There...