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Elliot Cardiff Major, Senior, Prefect & Crusader
Drive System, Screwcutting Gearbox & Headstock   Carriage Assembly   Accessories

From the 1940s to the 1970s Elliott made and marketed a number of different lathes but the most popular seem to have been the 7", 7.5" and 8" centre height Major, 8.5" Senior, 9" Prefect and the 11" Crusader, all produced by an Elliott manufacturing subsidiary the "Cardiff Lathe and Tool Works" with works in Taffs Well, a village 6 miles north west of Cardiff city centre. Built during the second world war as the "Patons Works" for the manufacture of ammunition the factory still stands today (2007), painted white but with the original green beginning to re-emerge. The chief designer during the 1950s was Charlie Robinson who, like many of his kind, had been trained at Herbert. Until about 1954 the beds were unhardened but after that the factory was equipped with flame-hardening equipment, though the process caused much trouble and proved a difficult process to master. Beds were hand scraped until the early 1960s, when a full-length grinder was installed.
The most frequently encountered
Cardiff is the 7.5" centre height Major that was also produced as rare 8-inch and (unpublicised) 7-inch centre height versions; all were available with between-centres capacities of 30", 40" and 60". The two longer versions could be ordered with a gap bed whilst the 30-inch capacity non-gap type was called, by a piece of meaningless advertising hyperbole, the "Chip Flow" and had the detachable gap "bridge" replaced by a straight section of bed with the centre opened up to allow swarf to fall through more easily. The bed was enormously wide, one-and-a-half-times the centre height, a figure better than many toolroom lathes whose beds only equalled or slightly exceeded it. The drive system was interesting and reflected, again, a practice normally reserved for toolroom and better-quality lathes where, in order to prevent the transmission of vibration-induced "gear-tooth" marks to the turned surface, the main transmission gearbox was mounted in the cabinet base next to its (3 h.p.) electric motor. The 9-speed gearbox was a very heavy-duty affair, oil-pump lubricated and containing forged-alloy, hardened and ground gears; the speeds were changed by two concentrically-mounted levers on the front face of the stand. The drive up to the headstock was by triple V belts that wrapped around the headstock spindle between its bearings; the belt tension could be altered by changing the position of the (patented-design) eccentrically-mounted output pulley on its gearbox shaft. The headstock itself contained a conventional backgear assembly situated immediately behind the front bearing, so producing a total of eighteen spindle speeds from 27 to 757 R.P.M or, fitted with the optional high-speed pulley set, 35 to 1000 RPM. An American long-key taper size L0 (or alternatively a plain flange) was fitted to the hardened and ground, 5-Morse taper spindle which was bored 117/32" (39 mm) and ran on twin opposed precision taper rollers at the front and a parallel roller race at the rear.
The gears in the double-wall apron ran in oil with the selection of feeds by well-thought out, patented snap-action controls; the electrical stop, start, forward and reverse of the headstock spindle could be controlled by two levers, one mounted immediately in front of the headstock the other on the right-hand side of the apron. An oil pump forced oil around the screwcutting gearbox, a box that was able to generate either 45 English or 20 metric threads at the flick of a lever whilst additional gears of 30T, 66T and 21T were supplied as standard to extend the threading range to pitches below the 2
3/4 to 80 t.p.i (and 0.1875 mm to 5 mm) range offered as standard. A variety of Diametral and metric module pitches were also available and listed, together with their required changewheels, on a comprehensive chart above the gearbox. The shear-pin protected leadscrew was mounted in tension and could, claimed the makers, be reversed end for end to prolong its life. Unlike its Colchester equivalents, the Cardiff was mounted not on a heavy, sheet-metal stand, but on large cast-iron boxes between which was a useful slide-out chip tray. If you have to install a heavy lathe in an awkward place, or several floor up in a building, the fact that a Cardiff can be broken down into smaller parts relatively easily makes it an ideal candidate for the job.
The set-over tailstock was held down by one central clamp, fastened by a single nut for which the maker's provided the usual self-hiding spanner. The barrel had a travel of 4.75" and carried a No. 3 Morse taper.
The Cardiff Major was a strong, no-nonsense and easily-operated lathe, capable of sustained hard work and popular with both self-employed engineers and larger jobbing shops.
Continued below: neil field

Elliott Cardiff "Major" 7" and 7.5" and 8" x 30" lathe circa 1958

Elliott Cardiff 8.5-inch centre height "Senior" model. The Prefect and Crusader looked identical

Continued:
The larger Senior, Prefect and Crusader models were all of identical appearance and appear, apart from the castings associated with their different centre heights and their headstock spindles, to have been built largely from the same parts; they all used an almost exactly similar design of cabinet-base-mounted 9-speed gearbox and backgeared headstock drive system as the Major and the carriage was also built along very similar lines - including the built-in spindle controls on the apron. The headstocks however were much more massively built and the oil-pump fed screwcutting gearboxes arranged along completely different lines. All were available with a choice of three sturdy, cross-ribbed gap beds that allowed 30", 48" or 80" to be admitted between centres - with the two larger models having the option of a gap bed and the shorter the so-called "chip-flow" design.
The 8.5" centre height (17-inch swing) Senior Model had 18 speeds that could be ordered from the works with ranges of 12 to 500 rpm, 20 to 970 rpm or 25 to 1200 rpm. The 1.75" (45 mm) bore hardened and ground spindle ran in twin opposed precision taper roller bearings at the front and a parallel roller race at the rear; the hardened headstock gears ran in an oil bath from a pumped supply.
The 9-inch centre height "Prefect" and 11-inch centre height "Crusader" were massive machines that weighed from 6188 lbs for the short-bed Prefect to 8184 lbs for the 80-inch capacity Crusader - with all models having usefully-large 3.0625" bore headstock spindles.  The 18 spindle speeds ranged from 20 to 1000 rpm on the Prefect and 15 to 750 rpm on the Crusader, both were fitted with 10 h.p. motors of 1460 rpm on 50 cycles or 1750 rpm on 60 cycles.
The screwcutting gearbox provided a generous range of feeds and threads on both models: 80 sliding feeds from 0.0023" to 0.232" per revolution of the spindle and 80 surfacing feeds from 0.0009" to 0.096";  56 English threads from 1/2 to 30 t.p.i, 24 metric from 0.5 to 30mm pitch, 27 diametral pitches (using alternative changewheels) from 2 to 30 D.P. and 13 metric modules (again with a different changewheel set) from 15 to 1/2.
The tailstocks on all larger models were given two bed clamping bolts and had a No. 4-Morse tapers in the barrel.

Wide and deep. The two longer versions of both the Major and the three larger Cardiff lathes could be ordered with a gap bed whilst the 30-inch capacity versions of all models had what the makers called a "Chip Flow" design - with that section of the bed normally occupied by the detachable gap bridge replaced by a straight piece with the centre section opened up to allow swarf to fall through more easily. The bed was enormously wide, one-and-a-half-times the centre height, a figure better than many toolroom lathes whose bed widths only equalled or slightly exceeded it.


Home    Machine Tool Archive   Machine Tools For Sale & Wanted

E-MAIL   tony@lathes.co.uk 
Elliot Cardiff Major, Senior, Prefect & Crusader

Drive System, Screwcutting Gearbox & Headstock   Carriage Assembly   Accessories