Manufactured by the ZDZ Precision Machine Tool Company, based at ul. Sxczecinska 57, 76-200 Slupsk Pomorskiein in Poland, so far the only ZDZ watchmakers' lathe discovered by the writer is just a single model, the TDA-8. However, this model, a light-pattern Geneva-type lathe, is likely to have been accompanied by others, including perhaps a heavier WW (Webster Whitcombe) version.
Of conventional watchmaker-lathe design, the TDA-8 had a 20 mm diameter round bed with the flat at the back and headstock and tailstock clamped on using short levers to close down slots in their castings.
Holding 8 mm collets the headstock spindle ran in large diameter, adjustable cone bearings - through with the addition of a ball race to take thrust, rather in the manner as originally employed on early Hammel, Riglander & Co. lathes. Lubrication of the bearings was possible, the maker providing either a pair of spring-sealed ball oilers or small screw caps. Collets were made by ZDZ themselves and had a rather fine 7 x 0.5 mm pitch thread - and hence are not directly interchangeable with those from other makers, though it is believed that Lorch collets, together with the correct draw bar, could be used instead. Dimensions of the 8 mm diameter ZDZ collets: overall length 34.8 mm; thread 7 mm x 0.5 mm; thread length 7.9 mm; measured thread diameter 6.97 mm; key width 1.6 mm and head diameter 12.1 mm.
A 3-step cone pulley was fitted, to take the usual round belt, with a ring of 60 division holes drilled into the front face of the largest diameter. Driven directly by a 14000 r.p.m. motor, spindle speeds spanned approximately 1000 to 5,300 r.p.m.
A number of accessories are known to have been offered including the usual range of collets and small fittings together with a proper screw-feed compound slide rest with a top slide having two longitudinal T-slots able to take the maker's 4-way toolpost. Clearly-engraved zeroing micrometer dials were fitted and the slide rest appears to have been of high quality. Also available was a lever-action tailstock with its spindle bored to accept collets.
If you have a ZDZ lathe of any type, or literature about them, the writer would be interested to hear from you.
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