email: tony@lathes.co.uk
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Juvenia Lathes
Switzerland

Based in La-Chaux-de-Fonds, Switzerland, the Juvenia Watch Company of manufactured top quality, hand-made watches and it is possible that their lathes were re-badged versions of those manufactured by either Waltham in the USA, or a very similar machine constructed for them by one of their specialist machinery suppliers, perhaps Bergeon or Favorite from the French-speaking cantons.  However, despite the foregoing, it is entirely possible that the machines were produced in-house - for Juvenia marketed not only a range of precision bench lathes but also (shown towards the bottom of this page) a beautifully designed and desirable - if strangely conceived - geared headstock lathe with a complex screwcutting gearbox - yet with its carriage and bed arranged along plain-turning lines. A further connection between Juvenia and the U.S.A. was through the firm of Breguet Frères & Cie. based in Le Locle, the twin town to La-Chaux-de-Fonds situated just five miles away. The Breguet lathe also bore an uncanny resemblance to the Waltham and may well have been another "branded" machine imported through the Waltham's Swiss agent, Mr. L.Ariste Gindrat.
With a centre height of 110 mm (4 inches), a between-centres capacity of around 600 mm (20 inches), weighing 160 Kg (252 lbs) and powered by a 0.22 h.p. 1400 r.p.m. motor, Juvenia listed their precision geared-head bench lathe as the
Universal Turner's Lathe. The bed featured twin V and flat carriage ways, with very distinctive, robustly proportioned T-slots down the top and both front and back faces - and was identical in form to that used on the maker's bench lathes. However, instead of being a simple flat-belt drive unit, the headstock was an oil-bath, all-geared type, with an amazing 20 speeds (7, 10, 13, 17, 22, 29, 38, 48, 63, 81, 105, 139, 177, 232, 299, 394, 513,656,861 and 1087 r.p.m.) driven by a motor mounted on the back of the lathe driving into the headstock through a universally-jointed shaft. Speeds were selected by a quadrant lever on the left-hand face of the headstock in combination with a centrally-mounted rotary control that gave 4 speeds for each setting of the quadrant. The headstock spindle was "clutched" and engaged by a second quadrant lever on the right-hand face of the headstock. Made from carbon steel the headstock gears were hardened to either 70 kg per mm(for the lightly loaded components) to 110 kg per mm2 for those under the heaviest stress. Also in carbon steel, the headstock spindle ran in bronze bearings (with their own, separate, lubrication system) and was fitted with a threaded nose. The draw-in collet fitting was described by the makers as designed for a 70 mm Waltham chuck - ("chuck" being a contemporary term for collet) - a reference that would seem to confirm a link between the two companies. In contrast to the sophistication of the headstock the carriage was unable to slide along the bed and was bolted in place, the long-travel top slide providing the longitudinal feed. Another remarkable feature of the lathe was a slide-on, slide-off screwcutting and power feeds gearbox held by two bolts into the bed's front T-slot. This could generate metric and English threads and also "Lowenhertz" pitches of gauge 0.25 to 2.5 for manufacturing worm milling cutters. Three power take-offs emerged from the box: one drove the top slide for screwcutting, another provided power (also through a jointed shaft) to a worm gearbox on top of the vertical milling attachment - whilst the third was  for connection to a backing-off attachment, a fitting necessary in the production of milling cutters.
Advertised as an all-purpose  machining centre the lathe was supplied complete with a wide range of accessories including a full set of wire, stepped and other collets, a "tracing table"; a universal vertical milling and helical gear-cutting attachment that was capable of being power driven; a dividing attachment - with worm drive - that fastened to the left-hand end of the headstock and a toolpost-mounted grinding attachment driven (rather neatly) though a flexible cable powered from a small countershaft (held in the rear T-slot of the bed) - itself turned by a belt from a pulley on the main motor.
If any reader has a machine tool of any kind produced by Juvenia the writer would be very interested to hear from you.

Of conventional "precision bench lathe" appearance - and similar to the American Waltham - the  plain-turning Juvenia precision was distinguished by an unusually wide top slide that carried two T-slots.

T-slots at the front and back of the bed - a feature of all Juvenia lathes - point to the likelihood that both chase-screwcutting and power-feed to the top slide were on the options' list

Juvenia precision plain-turning lathe with an epicyclic reduction gear fitted inside an extension to the headstock pulley. With no space to drill rings of division holes in the outside flange of the housing (as would have normally been provided) instead they were bored into its face. This unusual arrangement called for a boss to be cast integral with the headstock to hold a suitable location arm. 

A view showing the indexing arm and, concentric to in on the same mounting point and hanging downwards, a "hook" used to withdraw the pin that locked the epicyclic gears into their non-operable position.

On the end face of the pulley extension can be seen a shiny domed button - this is the head of a pin which, when withdrawn, allows the epicyclic gears to operate (once another pin has been screwed into the housing). The end of the forked arm was shaped with a sharp edge so that it fitted behind the head of the button and, as it was pressed inwards, drew it outwards and secured it against further movement

The Juvenia geared-headstock screwcutting  Universal Turner's Lathe. In this picture the gearbox is removed

The slide-on, slide-off screwcutting and power feeds gearbox

Note the unusual layout of the drive system with motor connected to the headstock through a universally-joined shaft.

Left: bed section of the lathe with "V" ways, T-slots on both front and back faces

A view into the 20-speed headstock

The complex milling and gear-cutting attachment. A shaft from the screwcutting gearbox could be attached to a worm gearbox built into the top of the unit.

email: tony@lathes.co.uk
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Juvenia Lathes
Switzerland