brake racing-brake racing-The use of outside calipers
Outside calipersbrake racing 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 diameter， 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。