Screwcutting was by a Norton-pattern quick-change gearbox, fitted with the usual sliding tumbler selector and lever controls, that turned a 40 mm (1.5625") diameter leadscrew with a 4 t.p.i. pitch (this being fitted for all markets). Unfortunately the screwcutting chart was fixed to the flat, upper surface of the gearbox where, over time, it was certain to suffer damage and wear. However, when new, the pitches and feeds it listed were: 36 Whitworth from 2 to 40 t.p.i., 36 metric from 0.25 to 12 mm and 14 modular from 0.5 to 5.5; sliding and surfacing feeds totalled 36, these running from 0.05 to 3 mm/rev sliding (longitudinally) and 0.01 to 0.9 mm/rev surfacing (across). A unusually large thread-dial indicator, pivoting from a bracket on the right-hand face of the apron, was fitted as part of the standard equipment.
Lubricated by an oil bath equipped with a level window, the apron contained gears and a clutch for the sliding and surfacing feeds that were selected and engaged by the action of a single lever. A good-sized, 3-spoke carriage handwheel was fitted, the inside of its rim moulded with finger grip grooves and the handgrip of the rotating type.
Both fitted with traditional "push" gib-strip adjustment screws, the cross slide was a full-length type with its feed screw running through a split, bronze nut adjustable to remove backlash while the top slide, able to be swivelled though 360°, carried, as standard, an indexing 4-way toolpost.
Fitted with a hardened and ground No. 5 Morse taper spindle locked by a proper split-barrel clamp, the tailstock could be set over for the turning of slight tapers and was locked to the bed by two bolts that required the services of a self-hiding spanner.
Standard equipment supplied with each new machine was sparse: coolant equipment with a 0.10 h.p. motor, faceplate, drive plate, two centres, spanners for the tailstock nuts, spindle-nose and 4-way toolpost and a handbook.
Offered as extras were taper turning, a selection of the usual 3 and 4-jaw chucks, hydraulic copying, rear toolpost, fixed and travelling steadies, possibly a spindle clutch/brake unit and other items to "...a customer's needs... "
During 1963 prices published by the makers for the three versions, including export packing FOB at a Spanish port, were: for the UK market £768, £803 and £852; for the United States $2,150, $2,250 and $2,384; for Germany DM8,600, DM9,000 and DM9,533; for France Fr10,750, Fr11,250 and Fr11,750 and for Switzerland Sf9,416, Sf9854 and Sf10,438.
Oddly, though several large directories were published in Spain during the 1960s listing that countries machine-tool makers, Zubi do not appear in any seen by the writer. Should any reader have further information, I would be interested to know.