Klemlast

Klemlast is a term used in Dutch engineering to denote the clamping force or clamping load exerted by a clamping device on a workpiece. It describes the force pressing the workpiece against a fixture, jaw, or other contact surface to hold it stationary during processing, measurement, or assembly. The klemlast results from the actuator of the clamp—screw, lever, pneumatic, hydraulic, magnetic, or other mechanism—and is distributed across the contact area.

The effective klemlast depends on the clamp design, the number and arrangement of contact points, and the surface interaction between clamp and workpiece. It is influenced by the material properties, surface finish, lubrication, and any preloads or springs in the fixture. Misalignment, part tolerances, and wear can reduce the usable clamping force or concentrate stress, potentially causing deformation or damage.

Measurement and design considerations: klemlast is typically specified as a required range or minimum value for a given operation. It can be measured with force gauges or load cells, or estimated from actuator preload and lever or hydraulic/pneumatic mechanics. Designers seek a safety margin to accommodate part variation, dynamic loads, and potential fixture wear.

Applications: klemlast is critical in machining, welding, assembly, metrology, and fixturing where parts must remain secure under external forces, cutting forces, or thermal effects. Appropriate clamping force balances stability and part integrity, avoiding excessive deformation or surface damage.

See also: clamping, fixturing, fixture design, friction.