Inside and outside calipers use

Inside and outside calipers use
The use of outside calipers
Outside calipers on a steel ruler to remove the size of the measurement surface of a clamp foot leaning against the side surface of the steel ruler, and the measurement of another clamp foot face of the quasi-required size in the middle of the groove, and two measuring surface The line should be parallel with the steel ruler, and the people's attention to the vertical steel ruler.
Use has been on a steel ruler to take a good size outside calipers to measure the outside diameter, make two vertical parts of the line for measuring surface axis, over the parts depend on the weight of outside calipers cylindrical, should we feel in the hands of outside calipers and parts of cylindrical exactly is the point contact, outside calipers, two measuring the distance between the surface and is measured zero change than the outer diameter of the tester. So, outside calipers to measure diameterbrake racing, the degree of tightness of the calipers of the relatively outer part cylindrical contact. When the calipers over the cylindrical our hands no contact feeling on the outside calipers parts outside diameter size, such as relying on the outside calipers weight can not be over the part cylindrical, it shows the outside calipers than a small part outside diameter. Must not be askew calipers placed on the workpiece measurement, such error. Outside caliper calipers have flexibility, puts pressure on the outer circle is wrong, not the caliper sideways card up. For the large size of the outside calipers, relied on weight over the part-cylindrical measurement of pressure is too great, and you should lift up the calipers to measure.
Within calipers of use
Within the caliper measurement of internal diameter should be two clamp foot measuring surface line exactly perpendicular to the axis of the bore, two measuring surfaces of the clamp feet should be the end points of the bore diameter. Therefore, the measurement should be to stop the measurement surface of the clamp feet below the pore walls as a fulcrum, the clamp feet above entered, some gradually out to test the orifice slightly and swing along the circumferential direction of the hole wall, along the hole wall circumference direction can swing the distance for the most hours, said caliper foot two measuring surface in the inner hole diameter of the two end points. Then the calipers to slowly move from the outside, you can test the roundness tolerance of the hole. Been in a steel ruler or outside calipers to take a good size inside caliper to measure the inside diameter. Is a comparison of calipers in the tightness of the hole parts. Hole has a larger swing freely within the caliper, said caliper size smaller than the aperture; such as within the calipers will not fit into, or into the hole after the tight swing freely, it means that within the caliper size than the aperture big, such as calipers into the hole, in accordance with the above-mentioned measurement method 1 ~ 2MM free-swinging distance, when the aperture with calipers size, just equal. Measurements by hand, do not grasp the caliper measurement, so the feel, difficult to compare the calipers in the tightness of the hole parts, and caliper distortion arising from measurement error.