Reported to accept standard 8 mm Lorch collets, this most unusual yet well constructed little lathe was manufactured in West Berlin during the early 1950s. Early versions are reported to have been of largely aluminium construction - but with later models using cast iron. The Rundex had, in effect, two beds, the upper being a round bar on which the carriage and tailstock slide with, beneath, a square bar to act as a secondary guide. Between the two beds was a leadscrew with a dog clutch operated by a sliding lever on the lower face of the headstock - the whole arrangement mirroring that arrangement used on the English 2.5-inch EXE lathe made from the early 1920s until 1939.
With a dog clutch fitted to the leadscrew there was no need for clasp nuts on the apron, though this meant that repositioning the carriage involved much twirling of the handle at the tailstock end of the bed. Tumble reverse was also missing and, as there was no stud to carry the required additional changewheel, no way of generating left-hand threads.
Carrying a 3-step V-pulley, the headstock spindle looks to have been supported in a bronze bush at the front and a ball race at the rear, the latter likely to have been a combined radial and thrust type.
Like a number of less-expensive lathes, for example the Emco Unimat and Drummond Little Goliath, the top slide was guided on two steel bars - an economical arrangement but not one that leant itself to fine adjustment to obtain that perfect balance between freedom of travel and a lack of play. By way of compensation, both slides were fitted with relatively enormous micrometer dials, a great boon when working on small parts.
Should you have a Rundex, the writer would be very interested indeed to hear from you.