email: tony@lathes.co.uk
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Early Colchester Triumph Lathes
Clausing 15" Models 6574, 6575, 6534, 6535, 6576, 6577, 6536, 6537
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A complete Data Pack is available for these lathes
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COLCHESTER HOME
Bantams Original
   Bantams 800, 1600 & 2000 Modern   Chipmaster   Student 1800   Mascot 1600
Student/Master Mk. 1 & Mk. 2   Student 3100   Master Original 1930s/40s  Master 2500
   Triumph Mk. 1 & Mk. 2   Triumph 2000   Mascot 1950s   Mascot 1914-18  Mastiff 1400              Magnum   Serial Numbers   Outline of Colchester Range as Text Only   Factory  Testing
Catalogue Covers   Early Drive System
   Colchester 1909/14   Colchester 1919   Colchester 1920s



Although most Triumphs, especially those destined for the home market, were fitted with a bed having a detachable gap, T-slotted apron wings and an oil-bath screwcutting gearbox that was able, at the flick of a lever, to cut 36 English pitches from 4 to 60 t.p.i. and 11 metric pitches from 0.5 to 6 mm, another, cheaper model, the "Dominion 15-inch" was also manufactured. This lathe lacked the T-slotted wings, the gap bed and was fitted with English screwcutting only, although with two additional pitches of 11.5 and 23 t.p.i.. On both lathes 36 sliding and feeds were available from 0.0033" to 0.048" per revolution of the spindle with the same number of surfacing feeds but at exactly half the rate (0.0015" to 0.024"). A set of extra changewheels was available to extend this range in both directions, though in some cases, when large changewheels were fitted, the otherwise inconvenient stud-mounted cast-aluminum gear and belt-drive cover had to be left off to avoid fouling the gears. Later models had an improved gearbox with 45 English threads and feeds and 12 metric pitches; the English range stretched from 120 t.p.i. to 4 t.p.i. and the metric from 0,25 mm to 6 mm pitch with the sliding feeds varying from 0.0017" to 0.48" per revolution of the spindle and, as before, the surfacing speeds set to one-half of those values.

Screwcutting charts for early Triumph and Dominion models

Screwcutting charts for later Triumph and Dominion models


Gap-bed Triumph with T-slotted saddle wings, the apron traverse handwheel on the right and leadscrew clap nut handle on the left.   

The apron was double walled but open at the bottom, so precluding any chance of the gears being run in oil; the power feed controls followed standard Colchester practice of the day being concentrated into a single lever that slid along the lower edge of the apron and was lifted into one of two slots to engage either power sliding or surfacing. Lifting the lever automatically locked the engagement whilst stopping the feed merely required the lever to be pressed downwards; unfortunately, the heavier the load on the feed the greater the effort required to disengage it, but at least it was a positive action and did not require a knob to be unscrewed in order to release a clutch.

Interior of the apron. The long pointed arm laying against the inner wall was part of the interlock mechanism that prevented the simultaneous engagement of power feeds and screwcutting.

Although not fitted to the very first machines, most of the first-model Triumphs had a simple but ingeniously-contrived spring-loaded ball-bearing "clutch" built into the junction of the powershaft rod with its gearbox connection..



A complete Data Pack is available for these lathes

Early Colchester Triumph Lathes
Clausing 15" Models 6574, 6575, 6534, 6535, 6576, 6577, 6536, 6537
     Page 1  :  Page 2Page 3
   
**********************************************************
Bantams Original   Bantams 800, 1600 & 2000 Modern   Chipmaster   Student 1800   Mascot 1600
Student/Master Mk. 1 & Mk. 2   Student 3100   Master Original 1930s/40s  Master 2500
   Triumph Mk. 1 & Mk. 2   Triumph 2000   Mascot - 1950s  Mastiff 1400   COLCHESTER HOME
           Magnum   Serial Numbers   Outline of Colchester Range as Text Only   Factory  Testing
Catalogue Covers   Early Drive System
   Colchester 1909/14   Colchester 1919   Colchester 1920s

email:tony@lathes.co.uk
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