The 6" centre height by  40" between centres D27 "Precision Leadscrew Lathe" was one of Lorch's heavier-ever lathes; tipping the scales at 670 Kg it was built on a traditional style of open cast-iron stand with a stout pedestal beneath the headstock and the 2-speed motor mounted at the back on an adjustable plate. A cast-iron chip tray, with a single central tool drawer, ran the full length of the non-gap bed ways. The motor drove downwards to an enclosed countershaft - the drive then being transmitted upwards through the pedestal leg by a flat belt to the headstock.
The bed was arranged with three Vees and one flat, so enabling the saddle and tailstock to be guided and aligned on independent surfaces. 
The 11/16" bore headstock spindle was made from high-quality steel, hardened on  its bearing surfaces and nose piece; it ran in adjustable bronze bearings and was supplied with oil from cast-in reservoirs situated beneath the spindle line. The 7 : 1 ratio backgear was clustered just behind the front bearing (like a Myford 7) with both gears rotating on a shaft below the spindle and its engagement lever positioned just behind the spindle nose. A two-speed electric motor was fitted with the option of ordering  normal or "high-speed" versions. The the ordinary motor fitted spindle speeds were: 41, 66, 82 and 132 rpm in backgear and 285, 465, 570 and 930 rpm. With the high-speed set up the speeds were exactly doubled and became: 82, 132, 164, 264 in backgear and 570, 930, 1140 and 1860 rpm.
The 5mm pitch leadscrew was made to the highest possible standards of accuracy and was driven not by a full screwcutting gearbox - but though an ordinary tumble reverse mechanism, changewheels and a simple gearbox which gave three sliding and surfacing speeds (and threads) for each setting of the screwcutting gears. In normal use the leadscrew was disengaged and a powershaft, driven from the 3-speed box, provided the sliding and surfacing feeds.

The BIIZ "Precision Screw-cutting and Surfacing lathe" (illustrated below) was of 120mm centre height and accommodated 550mm between centres (4.7" x 21.7"). It was built onto a substantial, vibration absorbing, all cast-iron cabinet stand which housed the three-phase, 3-speed (700/1400/2800 rpm) 3-phase 1.5 HP motor and flat-belt drive countershaft unit.
The bed was arranged with two Vees and two flats, one each for the guidance of saddle and tailstock. 
The 0.79" bore headstock spindle was made from high-quality steel, hardened on  its bearing surfaces and No.3 Morse taper nose; it ran in bronze bearings and was supplied with oil from cast-in reservoirs situated beneath the spindle line. The 8 : 1 ratio backgear was clustered just behind the front bearing (like a Myford 7) with both gears rotating on a shaft below the spindle and its engagement lever positioned just behind the spindle nose. Spindle speeds were: 44, 60, 88, 120, 175, 240, 350, 485, 700, 970, 1400 and 1940 rpm.
The 5mm pitch leadscrew had its side nearer to the headstock covered by an enclosing bellows and was driven by a tumble reverse mechanism, changewheels and a simple gearbox which gave three sliding and surfacing speeds (and threads) for each setting of the screwcutting gears. In normal use the leadscrew was disengaged - by a lever on the face of the three-speed gearbox - and a powershaft provided the sliding and surfacing feeds.