E.M.E. turret-head milling machine Type VO-A2F.
Identical to the machine offered by Myford as their VM-F, the VO-A2F was a heavily-built machine with a very decent specification. Built using the same cast-iron stand, box-section main column, knee and table of the belt-drive head models, this version had a number of useful refinements that made the operator's life rather easier. The ram was extended in length and able to be shifted forwards and backwards through 174 mm (6.875") - this change being made possible by a different design of head - and one that more closely resembled the type as typically used on a Bridgeport with the self-contained assembly hung from the front of the ram and with its rear-mounted motor driving forwards by a V-belt to the spindle. 5-step pulleys were used and, although not backgeared for slow speeds (as were many proper industrial-class machines of the same design) it did have a 2-speed, 3-phase 1/0.5 h.p. motor running at 1,00/1,700 r.p.m. that gave ten speeds from 160 to 2,840 r.p.m. For those with only a single-phase supply E.M.E. might have offered a 1-phase to 3-phase inverter that gave a variable-speed drive - though as these units were changing rapidly at the time and prices falling, details of its specification were never listed.
Fitted with the popular R8 taper nose, the spindle took was able to employ the wide variety of inexpensive tooling long available for the Bridgeport Series 1. The maximum clearance between spindle nose and the inside face of the column (the throat) was 155 mm (6") - though by 2003 a 100 mm (4") raiser block was being offered that, unfortunately, had to be factory fitted.
Quill feed was by both a rapid-action lever and fine-feed to the quill, the latter working through worm-and-wheel gearing with a micrometer-dial equipped handwheel graduated with 100 divisions of 0.02 mm or 80 of 0.001". A vertical ruler scale was also fitted, marked in either 80 divisions of 1 mm or 3.5" split into 1/16ths with, to control the depth of feed, a drill-type vertical stop adjustable by the usual pair of round, knurled-edge nuts. As far as can be determined, the quills of all versions and years had the same 80 mm (3.1875") of travel.
Surface ground, the table had ways that were claimed to be hand-scraped; it was driven by Acme-form feed-screws (metric or Imperial) supported in ball races where they passed through the table's end plates and running through split nuts that could be adjusted to compensate for wear. Both metric and inch models were offered; the former with feed screws of 4 mm pitch and the latter 5 t.p.i. the micrometer dials for all three axes being graduated in, respectively, 400 divisions of 0.02 mm or 200 divisions of 0.001". The micrometer dials were of a decent diameter, finished in satin chrome and equipped with face screw locks that did not upset the reading when used. A T-slot ran along the front face of the table, to hold the two adjustable longitudinal travel stops, while gib strips were of the tapered type, with adjustment screws at both ends that allowed a precise setting of the table's free movement. Although the VO-A2F used same table as the V0-A1S, it was carried on a different saddle that carried, on its right-hand face, a motor-driven 6-speed gearbox unit that provided both table power feeds and "rapids". Feed rates were split into high and low ranges: the former at 14, 32 and 50 mm/min and the latter at 75, 158 and 256 mm/min. with the rapid rate at 1250 mm/min..