Deutschland Dortmund built a wide variety of specialised roll-turning lathes - rolling being used in industry for a huge variety of tasks including (amongst many others) crushing sugar cane and rocks, producing paper and sheet steel, printing, textile work and forming, by the shape of a groove cut into the surface of a pair of rollers, the required profile on a strip of red-hot steel passed between them.
Given the model designation "DW", the roll-turning lathes were built with beds having either a conventional 3-way form as the Type DW-111 (as used on the Company's conventional large lathes) or with two separate beds, one at the front and one at the back. The latter type were divided into two group: those where the front bed, set level with that at the back, could to be slid along the base casting (Types DWv) and those where the front bed was elevated, being held on saddles able to be slid along the main bed (Types DWS).
DW-111 lathes were made in a choice of eight sizes as the models 31, 40, 50, 63, 71, 75, 80 and 85 with the numbers indicating the centre height in cm. DWv sliding-bed types could be had in seven sizes, all identical to the DW-11 lathes with the exception of the smallest, that was not available. DWS lathes were father restricted in choice, being available in a range of six as the Models 63, 71, 75, 80 and 85.
Sliding-bed lathes had their moveable element shifted by a long handle working through a ratchet system - a slow and steady arrangement but capable of shifting a great mass with comparative ease.
Headstocks were taken from the conventional lathes, with gearing and speeds altered to suit and retained the heavy-duty construction and forced lubrication checked through oil-flow inspection windows.
Saddles were of various forms to suit the particular job with some having all-hand feed, others with rotating power shafts and even screwcutting leadscrews but most equipped with a crank drive, exactly like that employed on a typical metal shaper with the rate of advance able to be set by moving the pivot point across the T-slotted drive boss. All types could be fitted with electrically-controlled tracing and profiling attachments and toolposts fitted with either conventional flat-plate or 4-way types - or replaceable by the maker's grinding heads.
Many kinds of steady were produced, from enclosed 3 and 4-point supports to open types able to support rolls with or without their bearings (and even the bearing housing)  left in place.
Motors ranged in size from 30 h.p. on the smallest machines up to 80 h.p. on the largest, all running at 1000 r.p.m. As the lathes were large and hence peripheral speeds high, spindles turned very slowly, just 1.2 to 36 r.p.m on smallest and 0.28 to 20 r.p.m on the largest..

Type D-11-80L with a swing of 1600 mm and 5,500 mm between centres. This is a roll-turning lathe - built specially for a sugar cane crushing plant. This example has a tailstock fitted with a faceplate with an inner, gear-equipped rim for use as a dividing apparatus

Two roll-turning lathes of the Type DWv-31 with a separate front sliding bed - the  upper section able to be moved along the supporting casting by a hand-operated ratchet (the holes to accept the long ratchet handle being visible to the left of the left-hand carriage and immediately below the right hand carriage). The carriages had no power longitudinal or other feeds and were operated entirely by hand.
The lathe at the front has a 500 mm swing and admits 2500 mm between centres (20" x 8' 4") while that at rear is slightly longer and admits 3000 mm (10'). Both are shown in position undergoing performance and operation tests)

Sliding-bed lathe of the Type DWv-40 with a 600 mm swing and taking 3200 mm between centres (23" x 10' 6") and equipped with hinged brackets to take the second counter roll.
The ratchet handle used to move the front bed way can be seen in position below and to the left of the right-hand carriage. Carriages had no power longitudinal or other feeds and were operated entirely by hand

Types DWv45 and DWv 40. The former with a swing of 700 mm and taking 3700 mm between centres (27" x 12') and the latter a swing of 600 mm and a capacity between centres of 3300 mm (23" x 11'). These lathes carried special steadies capable of carrying rolls complete with their roller bearings or, with some adjustment, plain bearings

Roll-turning lathe Type DWv with a 600 mm swing and taking 2000 mm between centres (23" x 6' 6"). A sliding-bed model, this version was fitted with a crank-driven front shaft (just like the drive to a shaper's table) to provide power longitudinal and traverse feeds

Type DWS-75, a specially arranged lathe for re-turning deep-grooved rolls. Note the short front bed carried on saddles able to be slid on the main bed (all DWS models had this feature) . This lathe had a 1225 mm swing and took 5500 mm between centres (48" x 18')

Type DW-111-71 with a 1150 mm swing and taking 4500 mm between centres (45" z 15'). A 3-way bed model this had a conventional form of front-mounted power shaft to give longitudinal and traverse feeds and rapids