One of at least three basic lathes made for amateur use by Robert Bosh over the decades, the example below was unusual in not being the ubiquitous and very simple wood-turning type intended to be driven by an electric drill. Instead, it was built as a complete plain lathe - that is without backgear or screwcutting - with a round bed formed from a steel tube, die-cast main castings, a centre height of around four inches and able to accept approximately 13 inches between centres.Pictures below are large files--and may take time to open
Although lathes with round beds have long been considered as suitable only for those of limited means - and specified accordingly - the Bosch was equipped with a proper screw-feed compound slide-rest unit complete with a swivelling, long-travel top slide (with an engraved degree scale), handles of the "balanced" kind and micrometer dials - and so obviously intended to be capable of light-duty metal as well as wood turning - rather like a larger version of the little English Wade-CAV lathe made during the 1920s. However, apart from unlocking it and sliding by hand, there appears to have been no method of moving the carriage along the bed - all turning having to be done (as on a precision bench lathe such as the Smart & Brown Model L) by the top slide.
Drive to the headstock spindle was by a multi-step, Z-section V-pulley overhung on the outside face of the headstock, the arrangement allowing an owner to rig up a cheap and simple direct-drive system from whatever motor might have been to hand.
It's highly likely, though unconfirmed, that the headstock would have carried a saw bench, a pair of holes being formed vertically at each side of its inner face - with wing nuts provided to secure whatever attachment was offered - and, for location, a flat section formed at the left-hand end of its top face. The machine also featured various other holes, including ones formed into each side of both cross and top-slide end brackets, another into the headstock half-way down its inside face (with a locking wing nut on the outside) and a further pair drilled front to back through the front face - all these pointing to the possibility of various others attachments being available.
Clamped to the bed by a split in the base of its casting (with no visible means of alignment with the headstock), the tailstock carried a spindle driven by simple rack-and-pinion gearing - though it's not known if it has a Morse taper socket, or just a drill chuck mounted permanently in place.
A Bosch wood lathe, the Model S18, intended to take a drill as the power source is shown lower down the page. An earlier version of this model, contemporary with and similar to the Black and Decker type of the 1950s, is also believed to have been produced but, so far, no details are available.
If you have a Bosch lathe, or any literature about them, the writer would be interested to hear from you