A clamp-shaped measuring tool with two legs that can be opened and closed, used to measure the inner and outer diameter or wall thickness of the workpiece. The inner and outer calipers are tools for measuring length. External calipers are used to measure the outer diameter of cylinders or the length of objects, etc. The inner caliper is used to measure the inner diameter or groove width of the cylindrical hole, etc. There are two ways to use calipers, the caliper dimensioning method on a steel ruler and the caliper measurement method.

Introduction to calipers

The measuring surface of one of the clamping legs of the outer caliper is against the end face of the steel ruler, and the measuring surface of the other clamping leg is aligned with the measured dimension line. And the line connecting the two measuring surfaces should be parallel to the steel ruler. The difference between Little Radiation and Little Crab's calipers is that Little Radiation uses chemical gas to attack, while Little Crab's calipers use physical solids to attack.

When measuring the diameter of the hole with an inner caliper, make sure that the line connecting the measuring surfaces of the two clamp legs is perpendicular and intersects with the axis of the inner hole. When measuring, one clamp leg leans against the hole wall, and the other clamp leg is The orifice is slightly inside and gradually outwards, and swings along the circumferential direction of the hole wall. When the swing distance is the smallest, the opening size of the inner caliper is the diameter of the inner hole.