email: tony@lathes.co.uk
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George Adams of London
2.75" Model CS Lathe

George Adams Home Page

GA Lathe Model 21/2  

G.A. Watchmakers' Lathes 

G.A. Round Bed Lathe

3.25" & 4.75" Screwcutting Lathes Models D, E, F, G & H

4" & 5.25" 4" & 5.25" Screwcutting Models A, B, L, KF1 and CL

3.25" & 4.75" Precision Lathes Models D, E, F, G & H

2.75" Screwcutting Lathe Model CS

Advertisements 1930

GA 21/2" Precision Plain Lathe

Watchmakers' Lathes

Portass-built Mk. 5 Lathe Photo Essay


Next to smallest of the conventiona George Adams conventional precision lathes was the 2.75" centre height by 12" between centres, backgeared cutting Model CS. The bore of the cast-steel "glass-hard" spindle was 10 mm (0.4") and took GA collets of size B with a maximum bore of 6 mm and a nose capacity of 8 mm; the spindle end was also threaded to accept conventional screw-on chucks and faceplates.  The spindle bearings were ground cast steel with a ball-bearing race to take thrust.
The bed was of an inverted V type, with two Vees, one to align the headstock and tailstock the other to guide the saddle. The feet were cast  integral with the bed - and had a rather early American Rivett look about them.
Arranged for round-belt drive the 3-step headstock pulley carried three circles of dividing holes with 60, 42, 36 and 24 indents. The lathe was obviously built to metric standards - it carried a 2 mm pitch leadscrew, a tailstock barrel micrometer dial graduated in 0.1 mm increments and metric graduations on the (typically tiny) compound slide rest dials.
The hand-operated rack feed to the carriage was direct - there being no intermediate gears - and hence the travel was "high-geared" and rather rapid.
Fitted with tumble reverse, the lathe was supplied with 23 changewheels that allowed a very wide range of English and metric threads to be cut. A travelling steady, hand rest , centres, spanners and headstock dividing pointer were all supplied but no motor or countershaft - these were available at extra cost in various forms for wall, bench or foot-treadle mounting.
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George Adams 2.75" Model CS

CS countershaft unit for wall mounting with central loose pulley. Because one of the two outer belts was fitted with a twist, the striker bar could flick either of them onto the central 'drive' pulley and so provide an instant reversal of the spindle drive

CS countershaft unit for bench mounting with single fast and loose pulleys.

The "Plain Stand" for the CS with rear-mounted electric motor and oak top with single drawer


George Adams Home Page

GA Lathe Model 21/2  

G.A. Watchmakers' Lathes 

G.A. Round Bed Lathe

3.25" & 4.75" Screwcutting Lathes Models D, E, F, G & H

4" & 5.25" 4" & 5.25" Screwcutting Models A, B, L, KF1 and CL

3.25" & 4.75" Precision Lathes Models D, E, F, G & H

2.75" Screwcutting Lathe Model CS

Advertisements 1930

GA 21/2" Precision Plain Lathe

Watchmakers' Lathes

Portass-built Mk. 5 Lathe Photo Essay

George Adams of London
2.75" Model CS Lathe
email: tony@lathes.co.uk
Home   Machine Tool Archive   Machine-tools Sale & Wanted
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