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Barnes Twin-leadscrew Lathe Circa 1880
CARRIAGE
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Carriage assembly: there were no graduations on the feed screws which were "wrong-handed"  - turning the handles clockwise resulted in the slides moving backwards rather than forwards.

The saddle - cast in one piece with the apron - provides an interesting contrast with contemporary designs; the rear part, instead of being long enough to share with the front the job of providing a solid base from which the tool could do its work, was made very short, as through the designer considered the various forces would only resolve themselves on the front shear. However, having shifted his attention to the front he decided to let the saddle curve over the front top "way" of the bed and make it run on the lower part of the bed's outer Vee and the narrow top of a cast-in shelf immediately above the rack.
The single bolt protruding from the face of the cross slide was used to release the top slide so that it could be swivelled; details of this mechanism are shown at the bottom of the page.

The Saddle and Apron were cast as one piece. Note that the saddle is resting on top of a narrow shelf, immediately above the rack, and bearing against only the lower portion of the bed edge.

Carriage traverse handwheel of the correct "balanced" kind.. An over-engineered but pleasingly designed screw-in boss provided the handwheel-spindle support.
The location of the saddle against the top of the rack can be clearly seen.

The top of the cross slide was provided with an inverted conical section slot into which a matching section on the base of the top slide fitted. A single square-headed bolt pushed a bronze locking plate into place.

The degree graduations for the top-slide swivel were engraved so that, once out of the central position, the zero mark met then at an awkward angle. The number stampings were at inconveniently-wide 30 degree intervals - which would have involved the operator in lots of time-wasting counting to arrive at the intended setting.

Home    Machine Tool Archive    Lathes for Sale    Shapers, Millers & Grinders for Sale
E-MAIL   Tony@lathes.co.uk   

Barnes Twin-leadscrew Lathe
CARRIAGE
Twin-leadscrew Home Page   Tailstock   Headstock     

Barnes Home Page   9" Lathes    11" Lathes  13" Lathes  13" Engine Lathe