Other Precision Bench Lathes
Like the machines from Irmscher & Whitte, also built in Dresden, those from C.L.Roth are rare, even in their home country. The example shown below, a simple plain-turning type from the period 1870 to 1900 or so, appears to be not quite of the quality exhibited by other contemporary German makers of high-precision bench types such as Lorch, G.Boley and Wolf Jahn.
Although difficult to date and categorise precisely, the use of bronze "box" headstock bearings secured by a two-bolt plate might put the lathe somewhat earlier - perhaps into the late 1860s - while also confirming that the makers were either not aware of the latest developments in high-speed headstock bearings (hardened and lapped spindles running in glass-hard steel bearings as developed by Stark in the United States) or choose not to employ them. However, the bearing arrangement was anything but simple, instead of square-form slots cut into the headstock casting to take drop-in bearings machined from cubes of bronze, each side of the bearing housing was triangular - the arrangement being used to locate a pair of top and bottom bearing holders into which fitted round bearing shells. Despite this elegant over-engineering of the headstock, in other all other respects the lathe was conventional, with the compound slide rest and tailstock both held to the V and flat-way bed by a through-bolt fitted with an open, "oval" handwheel in cast iron. Instead of being punched into the forward face of the headstock - as was the name of many other makers of this type - on the C.L.Roth it was engraved by hand. Might the avoidance of an expense, hardened punch point to a limited production run?
The headstock drive pulley, with a 4-step arrangement of V-shaped grooves for drive by a round leather rope, was fitted on its front face with a screwed-on bronze plate drilled with four circles of indexing holes - a common thing to find on lathes of this type (though most had the holes drilled direct into the casting).
As the lathe had no feed for the carriage, following established precision plain-lathe practice, the top slide - which could be swivelled - had the usual extra-long travel. As to be expected, no micrometer dials were fitted and the feed screws fitted with common-for-the-era cranked handles.
Two more lathes by C.L.Roth lathe have now been found and shown at the bottom of the page. The example painted grey is of an almost identical appearance to first shown save for a different design of tailstock.
The third lathe has a very different and more cheaply constructed headstock that echoed mid 19th century small-lathe practice. While an ordinary bronze bearing was used at the front, at the rear the spindle was turned to a point, hardened and made to bear against an adjustable thrust bolt. Even though this was a cost-cutting shortcut suitable for a light-duty lathe, it was common practice at the time even for some lathes of higher quality such as versions of the English Hayward and Hines.
Wenn Sie eine Drehmaschine von Roth haben, wenden Sie sich bitte an den Autor