"My" first was one I rescued from a local scrap-yard for our club workshop, to replace a hefty great shaping-machine.
It really was a museum-piece. Made by the French company HURE, probably in 1880s or so, it was an early universal-mill with an L-shaped turret. One arm carried the horizontal spindle of unknown taper (I made a fitting for it, to carry a 3-jaw lathe chuck). The other arm carried the vertical spindle with a curious precursor to the Autolock principle. The collet- or tool- holder had a large nut resembling a union nut, but with one thread where you'd expect, and a second, finer one in the smaller diameter. We never discovered how it was meant to be used – probably with long-lost tooling.
To change spindles entailed slipping 2 or 3 flat belts off, removing a dog from the turret rim, rotating that and replacing the dog in a second V-notch, then fitting a second set of belts. With its confection of plain cast-iron pulleys on steel spindles, the whole thing was almost too much for the 3ph, 3HP motor donated from the displaced shaper. (The rented workshop had a 3ph mains supply.)
Subsequently I replaced it with a (Denbigh?) horizontal mill surplus at my work-place. The Hure found a happy new home at Weston Zoyland Pumping-station museum for a while, then a change of direction sent it to a new owner. I learnt that by a fluke – the new owner happened to a friend of one of my caving-club fellow members! Then this year, visiting the Museum, I told one of the volunteers of that machine. He knew of it, and said it's moved on again. It gives one a rather warm feeling knowing that my rescuee for all of £30 (in the 1980s) is still in good hands.
I believe HURE still trades, making very large, very sophisticated NC machining-centres.
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So whilst nominally those were my mills, my own first were a WARCO mill-drill with round column, and a Denbigh H4 horizontal. Both were second-hand but the Denbigh, from a bereavement sale, was in the most intriguingly ramshackle workshop I have ever seen, in an old sheet-steel garage next to a house.
It had been built for line-shaft drive so its owner had blessed with an angle-iron tower above the machine, carrying an old 1ph motor with belt drive to a Ford 3-speed car gearbox thence by chain to a motorcycle sprocket screwed to the standard cone-pulley on the mill's spindle.
The Warco has found a new home, replaced by a Myford VMC now sporting an Allendale DRO set and awaiting the 3ph conversion still up in my bedroom.
The Denbigh is in a queue of tasks and projects but I intend to put it back into service, as a small but potentially useful machine. The original arbour was badly worn but I found a replacement at an exhibition. The spindle taper is a convenient 3MT.
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I did have a Centec 2A and fitted it with a Tony Griffiths raising-block, but when I moved home a few years later, something had to go and it was that, as more saleable than the Denbigh.
I do though also have a BCA jig-borer that came with a 3ph inverter of unknown history and condition for its original motor, so I crossed Messrs Newton's and Tesla's palms with silver yet again, for the full 3ph set.