email: tony@lathes.co.uk
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HARRISON 10-inch & 12-inch (Mk. 2) Lathes
Manuals are available for most Harrison lathes
Flat-belt Drive L2   An Original L5
Harrison Home Page   L5 Early Model   Later L5 9" & L5A 11-inch"   140   
L5 Accessories   
10-inch   Late 10" & 12" L6   Early 12" L6     Late L6 Mk. 3   
13" & 15" Late Models    13"   14"   16"   17"    Hydraulic Copy Lathes
Harrison Union Lathes   Models 155 and 165   Model 190
14", 16" & 17" Accessories
Newer Models
:
AA-10 VS  VS330 & AA   M250   M300   M350 & 390   M400   M450   M500   




Built in tiny numbers from around 1966 to 1968 these 10-inch and 12-inch lathes were of an almost completely different design to the original L Models, had smooth-faced stands unlike any used by Harrison before and with features that foreshadowed the modern M Series lathes of the 1970s. The 12-inch was the second such size to be made by Harrison - and hence the MK. 2 - but was replaced after only 2 years by the Mk. 3 that used a similar configuration of headstock but a new type of screwcutting and feeds gearbox but with the apron design as used on older L5/L5a/11-inch models. The 10-inch appears to have been discontinued on the introduction of the Mk.3 12-inch. In turn this lathes were superseded by new and rather longer-lived 13 and 15-inch models.
In line with styling and engineering changes to Colchester lathes (made by the same group)  a flat front was used on the headstock with a spring-loaded safety engagement lever for high and low speeds; the gearbox changed for a totally new, square-looking, fully-enclosed "dial-type" type with three control levers ranged in a line along its top edge whilst a raised section at the end of the top slide casting allowed the fitting of a larger micrometer dial. On the 12-inch version only an electrical-control shaft ran beneath and parallel to the power shaft with two control levers, one on the right hand face of the apron and the other just outboard of the screwcutting gearbox. Both lathes were offered with either 24 or 40 inches between centres and with induction-hardened beds as part of the standard specification. supplied as standard.  Bored to pass 1.375 inches the spindle could be supplied with either an L00 or D1-4" Camlock nose fitting to the customer's choice. Three motor option, two single speed and one 2-speed were listed: the single-speed 1.5 h.p. motor gave 34 to 750 r.p.m., the 2 h.p., 45 to 1000 r.p.m. and the 2-speed 3/1.5 h.p. motor a much more useful 16 speeds from 34 to 1500 r.p.m.
If you have one of these lathes the writer would be very interested to hear from you..