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Related to calipers: brake calipers, Digital calipers


(US), caliper
1. an instrument for measuring internal or external dimensions, consisting of two steel legs hinged together
2. Med a splint consisting of two metal rods with straps attached, for supporting or exerting tension on the leg



a device that is lowered into a bore hole on a cable to determine the diameter of the hole. Mechanical and ultrasonic calipers are used.

The most commonly used mechanical caliper consists of three or four lever feelers (probes), which are pressed against the walls of the bore hole by springs, and a rheostat whose sliding contact is connected to the feelers by means of pushrods. A change in the diameter of the borehole produces a proportional change in the resistance of the rheostat. This resistance is measured on the surface and, as a result, a curve is produced showing the change in the diameter of the borehole from the face to the mouth of the hole. Recent models are equipped with a controlled lever device that can be opened and closed repeatedly on command from the surface.

An ultrasonic caliper is a hydrolocating device with two directional electroacoustic transducers located on opposite sides of the borehole instrument. Each transducer operates alternately as an ultrasonic oscillation emitter and detector. The time interval between the moments of the transducer’s emission and its reception of the ultrasonic pulse reflected from the wall of the borehole is measured on the surface. Since the interval is proportional to the distance from the device to the borehole wall, two longitudinal profiles of the borehole are produced, characterizing its diameter.

Since the cross section of a borehole is usually noncircular, instruments have been developed that permit measurement of the size and shape of the cross section.



(design engineering)
An instrument with two legs or jaws that can be adjusted for measuring linear dimensions, thickness, or diameter.


An instrument, resembling a pair of dividers, with adjustable legs for measuring the diameter or the thickness of bodies. Also see inside caliper and outside caliper.
References in periodicals archive ?
In use, the attachment is in two parts, one fitting each blade of the caliper and secured with 5/62 hex bolts.
Surprisingly, engineers determined the introduction of KERS requires a smaller rear brake caliper, which helped cut some of the weight penalty.
Continental Teves, which employs 600 people, already supplies a specialist caliper for the latest high-performance Golf R32, and components for the Audi A3.
I've heard many screams and gripes about "cheap" stuff from China, and it is true that these calipers are very affordable, but my tests fail to show any loss of accuracy when compared with top-of-the-line American or Japanese tools of the same type.
The brake can be equipped with as few calipers as need.
The caliper uses a ball and ramp design, allowing the use of a hand lever for activation.
Hydrostatic weighing is often considered the most accurate clinically available method, although Lange calipers produce similar estimates.
Mahr Federal has introduced the next generation of waterproof digital calipers with the new MarCal 16 EWR.
Contract notice: Legfekszerelvenyek, calipers, disc brake repair, refurbishment business
Rarely does a company present a product for which the rule book is not just torn up but also thrown far away, but that is just what AP Racing has done with its new calipers.
I started with dial calipers and as soon as possible graduated to Electronic Digital Calipers.