With a range of confusing model designations, Denford's range of less-expensive lathes intended for the education market was based upon a single 5" x 24" or 40" machine very similar to the original TDS 1/! - but usually without the power shaft for sliding and surfacing feeds, and often without backgear and screwcutting. The most common appears to have been the "Educator" a dual-purpose wood and metal lathe that was produced in several forms, most supplied were of very basic, plain-turning speciation (the code for these was T.D.S.4) others more comprehensively equipped with backgear and screwcutting (code T.D.S.1) - and some even appear to have been little more than price-reduced machines from the main range. Although some carried badges proclaiming Educator others did not, but the Model type can generally be found stamped (as part of the Serial Number) into the bed at the tailstock end. All appear to have shared a common headstock assembly, some with 4 belt-driven speeds, others with 8 of 60, 85, 135, 200 in backgear and 410, 570, 930 and 1350 in direct belt drive - though some have been found with a slightly different range of 75 to 1300 r.p.m. A push-button starter and Dewhurst reversing switch, both built in flush to the front face of the stand, were part of the ordinary electrical equipment. The late-model (seldom-seen) T.D.S.1.L.S. and Type 250 were the most highly-specified models with backgear and screwcutting - though the latter feature could be replaced with a cheaper power sliding feed by a chain or belt-driven leadscrew where the drive could be flicked in and out by a dog clutch, the operating handle of which was positioned in the lower right-hand corner of the headstock's front face. The T.D.S.5.B.G. was backgeared but with the power feed removed and the T.D.S.3.M.W. a special plain-turning metal lathe fitted with an outboard bowl-turning rest adapted from the T.D.S.6.W.L. dedicated wood lathe.