Clamp (tool)

A screw clamp is a clamping means for compressing and retaining a plurality of workpieces during machining. Very large clamps are also known as screw clamp.

A screw clamp consists of a fixed and a on a - sometimes fluted - movable rail clamp arm. The chucked workpiece is first applied to the fixed clamping arm and fixed roughly by moving the movable clamping arm. The fine adjustment and the pressing with high power is provided by a screw which passes through the movable clamping arm on the opposite side of the rail. When creating the threaded spindle of the movable clamping arm tilted slightly and is so focused on the rail. The spindle is rotated via a handle or to increase the rotational force of a toggle. At the other end of the spindle is a movable ball pressure plate. In woodworking, the clamp is used for example to compress glued together objects until the adhesive has cured.

Among other things, malleable cast iron screw clamps are distinguished (steel rail with malleable - fixed and sliding ) and the all-steel screw, both the fixed arm manufactured as one piece and the slide and the sliding arm made ​​of steel in the. Because of the higher elasticity of the all-steel clamps, these are suitable especially for clamping tasks in machining operations, where vibrations occur.