Herbert 2D 6 turret lathe with pegboard control and hydraulics

[john swift]

Is it one of the early EMI-MEC Nichols controls using a Uniselector or a later version with the array of 48v Dc relays replacing the uniselector ??

if I remember correctly the electronic dwell timers us the 2N2046
unijunction transistor

the yellow programing pins have a diode inside
at each step multiple pins can be plugged in to power several relays and solenoid valves
the diodes form a diode "OR" gate to prevent the +48V from one step of uniselector (or later sequencing circuit) back feeding to other step outputs

John

[Paulm22]

Worked on these back in 1970s whilst serving my apprenticeship .Also went to the factory in East Grinstead on a training course to programme. The factory where I worked had over 40+ lathes of various types either bar feed for first operation work or chuck loaded via a magazine for first and second operation work all, using this sequence control system. As a setter I would have six machines and an operator to assist, who would attend to the loading of bar, billets or part machined component plus removing swarf. Happy Days. They were still in use up to the late 1990s.