Ruuvikaliipperit

Ruuvikaliipperit, also known as screw calipers, are measuring instruments used to determine dimensions such as the internal or external diameter of an object, or the depth of a hole. They are characterized by a screw mechanism that allows for fine adjustment of the measuring jaws.

The primary components of a ruuvikaliipperi include a fixed jaw, a movable jaw, and a threaded screw. The movable jaw slides along a bar, and its precise positioning is controlled by rotating the screw. This screw mechanism provides a significant advantage over spring-loaded calipers, as it allows for very accurate settings and the ability to lock the jaws in place.

Ruuvikaliipperit are typically made of metal, such as steel, to ensure rigidity and durability. They come in various sizes, designed for measuring a wide range of dimensions. The accuracy of a ruuvikaliipperi depends on the quality of its construction, the precision of the screw thread, and the skill of the user.

The operation involves opening the jaws wider than the dimension to be measured and then carefully tightening the screw until the jaws make firm contact with the object's surfaces. Once the measurement is taken, the jaws can be locked, and the dimension can be read from a scale, often marked on the sliding jaw or a separate vernier scale. This type of caliper is valued for its precision and stability in holding a measurement.