Typical of the many variations on a theme produced by third-party suppliers, and included in the main Bridgeport catalogues, the Moog Hydra-point three-axis, numerically-controlled miller was manufactured in England during the 1960s by Moog Hydra-point Ltd. on a machine made by the Bridgeport subsidiary, Adcock & Shipley Ltd.
The machine was designed for straight-line milling, drilling, reaming, boring and tapping and was controlled by a numerical control unit, with pneumatic tape reading, that took standard 1-inch wide 8-track paper tape. Both the cutting tool and the workpiece were positioned hydraulically.

Syncho-Trace
Designed for die sinking and mould making this special T-head machine was fitted with automatic vertical, longitudinal and traverse feeds. The tracer unit could be mounted in any convenient position on the head - it is shown on the right-hand side of the T head in the illustration - and as the stylus followed the template outputs were generated that automatically directed both the depth and profile cuts - whilst simultaneously regulating the longitudinal and traverse feeds.
A "pick-feed" mechanism could also be made to control, by means of a selector dial, the rate and amount of "pick". The device could be reversed or changed directionally during the course of a cut to allow cross-hatching on both rough and finishing cuts.
The feed rate was infinitely variable at up to 13 inches a minute, with parts duplicated at a fixed ratio of 1 :1.
Unlike other models of Bridgeport automatic copying machines, the table feeds were through the ordinary feed screws, activated by chain drive from hydraulic motors, not hydraulic cylinders, so permitting the machine to be pressed into service as an ordinary miller should the need have arisen.

Model 3-D Hydraulic Copying Machine
This Bridgeport had its extra-long table movements controlled by hydraulic cylinders, so precluding its use as an ordinary miller. The general layout was very similar to the Synchro-Trace illustrated above, but with manual rather than automatic controls. The operator is seen guiding a stylus around the work sample whilst each of the three heads produces an identical copy.

Model 3-DA
This version of the hydraulic-copying Bridgeport was an automatic version of the 3-D Model shown above.  A hydraulic valve controlled the longitudinal and traverse feeds whilst, through the control of a single knob, masters and templates could be automatically followed.
Three-dimensional tracing was also possible by disengaging the hydraulic-control valve

Tee Ram
A special ram was needed to carry the Tee head but, as it was interchangeable with any Bridgeport model, it allowed even older machines to be converted to production status whilst permitting the stylus on a hydraulic copy miller to be mounted much further away from the (single) head - and so increase its copying capacity.