TOS Zbrojovka FA5-V Vertical
A considerable more powerful machine than the FA4, the TOS Zbrojovka FA5V, FA5H and FA5U are all easily distinguished from the smaller models by the twin-bar supports at the front of their massive knees. All had a table 425 mm wide by 2000 mm long with three 20 mm T-slots on a 90 mm spacing and both power and "rapid" feeds longitudinally, in traverse and vertically by a separate 2.4 kW (3.25 h.p.) 1410 r.p.m. motor. Rapids were driven from the same motor (flange mounted against the rear of the feed gearbox that was mounted at the left-hand side of the saddle) with initial drive through a pair of bevel gears and then through multi-plate clutches with overload protection - a single spring-loaded directional lever on each axis providing the control. Travel stops were not mechanical but electrical, their activation stopping the motor.
Longitudinal travel was 1410 mm by hand and 1400 under power and, respectively, across 450 and 440 mm and vertically 460 and 450 mm. 15 rates of power feed were available, these being the same as on the FA4 and ranged from 10 to 1250 mm/min both longitudinally and across - the full range being: 10, 14, 20, 28, 40, 56, 80, 112, 160, 224, 315, 450, 630, 900 and 1250. Vertical rates were set at 25% of the others, being from 4 to 250 mm/min. Rapid traverses were set faster at 3200 mm/min longitudinally and across and at 800 mm/min vertically. Table power-feed controls - selection of direction, engagement and rate were all duplicated at the rear of the saddle at its right-hand end, so allowing the machine to be operated from the rear of the table - a possible bonus on some long or awkwardly-shaped jobs. An added and rather unusual safety feature was a pair of illuminated arrows that indicated the direction of table travel selected
Positive lubrication of the feed speed-change gearbox was by a piston pump, the recirculating supply also able to be directed (unfortunately not automatically but by pressing a handle), to send oil to the table feed screws and their support bearings and the sliding surfaces of table, saddle and knee. The heavily loaded knee screw was lubricated by an oil bath and, copying established Cincinnati practice, when normal or rapid feeds were engaged by a circulating supply.
Both horizontal and vertical spindles were mounted on their noses in a precision-grade, double-row roller bearing with a tapered bore that allowed a very precise adjustment to be made of the running clearance. Listed as standard was an ISA70 spindle nose fitting, with the option of a Metric 50 - though doubtless others would have been supplied to special order and may well be found on second-hand machines. On horizontal machines the makers offered the option of a spindle fitted with a flywheel, the intention being to make it more suitable for use with cemented carbide tipped blades.