Calipers
CALIPERS
Calipers are used to measure point-to-point distances, such as diameters. A diameter is the straight distance across a round object. We also use calipers to compare sizes with standards such as a graduated rule. The vernier caliper is only one of many types of calipers.
Types of Calipers
There are several types of calipers to do this job. The repairer’s job is easier if the right design of caliper is used. Outside calipers make outside measurements; inside calipers measure inside sizes. Next, we will look at some of the different types of calipers.
Simple Calipers. Simple calipers are used along with a scale. The simple calipers used for outside measurements are bowlegged. Those used for inside diameters have straight legs with feet turned out. You can adjust these calipers by pulling or pushing the legs to open or close them.
Spring-Joint Calipers. The spring-joint calipers are a lot like simple calipers. They are shaped either for inside or outside measurements. They have the same shape of legs, but their legs are joined by a strong spring hinge, screw, and adjustment nut.
Transfer Calipers. Transfer calipers also look a lot like simple calipers. They are used to measure grooves or flanges. One of the legs has a small leaf. Use transfer calipers to measure as you would use simple calipers. Lock the leaf to the leg. Open or close the legs, as needed, to clear whatever is in the way. Then bring the legs back and lock them to the leaf. This brings them to the original setting.
Hermaphrodite Calipers. This caliper is used to find the center of a shaft. It is also used to locate shoulders. It has one straight leg ending in a sharp point. On some models, this point can be removed. One leg is usually bowlegged.
Slide Calipers. Most calipers come in two shapes. One shape measures an outside distance; the other measures an inside distance. A single slide caliper can be used to measure both outside and inside dimensions. One edge of the caliper jaw measures outside, and the other edge measures inside dimensions. Slide calipers have their own scale. The other side of the caliper is used as a straight measuring rule.
Vernier Calipers. Like slide calipers, vernier calipers have jaws that make both inside and outside measures. They have their own scale. They are very accurate. Of the many caliper types, this subcourse only talks about how to use, read, and care for vernier calipers.
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