An American-designed  DeVlieg Type 2B-36 - a machine with the reputation for super-accurate, jig-free machining. However, this is almost certainly a UK-made machine, manufactured under licence by Herbert

Another fine-quality American machine tool used in the INDEX works was this Giddings and Lewis Horizontal borer. As it was accurate enough to perform in a similar way to the DeVlieg - able to produce interchangeable work without the use of jigs - the factory employing it for both small batch work and one-off jobs

A Köllmann twin-head production milling machine. Whilst one casting was being face-milled on both sides simultaneously the table was long enough for the operator to load and prepare the next in line.

Surface grinding of the upper main frames. Previously hand-scraped, the factory found (unsurprisingly) that grinding gave a more consistent finish in a shorter time

Radial-arm drill with two swivelling faceplates set at right-angles to each other.  The jobs are jig-mounted and rotated as necessary to complete the machining at one loading

Vertical honing machine by Nagel GmbH of Nürtingen accurate to 0.001mm. The stroke of the machine was controlled hydraulically with compressed air moving the grinding stones of the honing tool onto the wall of the hole. The amount of material removed was measured by a pneumatic device and, once to size, cut off the air supply so ending the operation.