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Screwcutting, Countershafts, Backgear, The Watchmaker’s Lathe, Quick-change Toolholders, Fitting a chuck, Spindle Nose Fittings, More Names of Parts
The lead screw provides automatic feed and makes thread cutting possible. It is a precision-threaded shaft, driven by gears as the headstock turns. It passes through the front of the carriage apron and is supported at the tailstock end by a bearing bracket. Controls in the apron engage a lead nut to drive the carriage as the lead screw turns. Continue reading
The cross-slide is mounted to the top of the carriage to provide movement perpendicular to the length of the bed for facing cuts. An additional motion assembly, the compound rest, with an adjustable angle, is often added to the top of the cross slide for angular cuts. The cutting tools that do the actual metal removal during turning are mounted in an adjustable tool holder clamped to the compound rest.
The Carriage provides mounting and motion control components for tooling. The carriage moves left and right, either through manual operation of a hand wheel, or it can be driven by a lead screw. At the base of a carriage is a saddle that mates and aligns with the bed ways.
The Lathe‘s cross-slide, compound rest and tool holder are mounted to the top of the carriage. Some carriages are equipped with a rotating Turret to allow a variety of Tools to be used in succession for multi-step operations.