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Encyclopedia > Calipers

A caliper is a device used in the metalworking field of mechanical engineering, to measure the distance between two symmetrically opposing sides. A caliper can be as simple as a compass with inward or outward-facing points. After the measurement is taken the distance can be read by applying the caliper on a ruler or between the jaws of a Vernier caliper. Metalworking is the craft and practice of working with metals to create parts or structures. ... The Ford Essex V6 engine Mechanical engineering is the application of physical principles to the creation of useful devices, objects and machines. ... In classical physics and engineering, measurement is the the result of comparing physical quantities of objects, relations (e. ... a compass In drafting, a compass (or pair of compasses) is an instrument]] used by mathematicians and craftsmen in for drawing or inscribing a circle or arc. ... A ruler is an instrument used in geometry and technical drawing to measure short distances and/or to rule straight lines. ...

Contents


Inside caliper

Two inside calipers
Two inside calipers

The inside calipers on the right are used to measure the internal size of an object. Download high resolution version (1977x1413, 451 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ... Download high resolution version (1977x1413, 451 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ...

  • The upper caliper in the image (at the right) requires manual adjustment prior to fitting, fine setting of this caliper type is performed by tapping the caliper legs lightly on a handy surface until they will almost pass over the object. A light push against the resistance of the central pivot screw then spreads the legs to the correct dimension and provides the required, consistent feel that ensures a repeatable measurement.
  • The lower caliper in the image has an adjusting screw that permits it to be carefully adjusted without removal of the tool from the workpiece.



Outside caliper

Three outside calipers.
Three outside calipers.

Outside calipers are used to measure the external size of an object. Download high resolution version (1935x1401, 502 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ... Download high resolution version (1935x1401, 502 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ...


The same observations and technique apply to this type of caliper, as for the above Inside caliper. With some understanding of their limitations and usage these instruments can provide a high degree of accuracy and repeatability. They are especially useful when measuring over very large distances, consider if the calipers are used to measure a large diameter pipe. A vernier caliper does not have the depth capacity to straddle this large diameter while at the same time reach the outermost points of the pipes diameter.


Divider caliper

A pair of dividers
A pair of dividers

In the metalworking field divider calipers are used in the process of marking out suitable workpieces. The points are sharpened so that they act as scribers, one leg can then be placed in the dimple created by a center or prick punch and the other leg pivoted so that it scribes a line on the workpiece's surface, thus forming an arc or circle. Download high resolution version (2007x1110, 401 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ... Download high resolution version (2007x1110, 401 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ... Metalworking is the craft and practice of working with metals to create parts or structures. ... Marking out is a moment of enjoying professional wrestling for what it is rather than analyzing its staged nature, and can be a sought-after experience for fans whose insider knowledge can make them jaded toward its entertainment aspect. ... Center A center punch is typically used as an aid to drilling operations; a drill, when brought into contact with a flat surface, will have a tencancy to wander on the surface until it gains sufficient purchase to start cutting a hole. ...


A divider caliper is also used to measure a distance between two points on a map. The two caliper's ends are brought to the two points whose distance is being measured. The caliper's opening is then either measured on a separate ruler and then converted to the actual distance, or it is measured directly on a scale drawn on the map. On a nautical chart the distance is often measured on the latitude scale appearing on the sides of the map: one minute of arc of latitude is approximately one nautical mile or 1852 metres. A map of the world by Johannes Kepler A map is a simplified depiction of a space, a navigational aid which highlights relations between objects within that space. ... This article is in need of attention. ... A nautical chart is a graphic representation of a maritime area and adjacent coastal regions. ... Latitude, denoted by the Greek letter φ, gives the location of a place on Earth north or south of the Equator. ... A nautical mile is a unit of length. ... metre or meter, see meter (disambiguation) The metre is the basic unit of length in the International System of Units. ...


Oddleg caliper

Odd leg calipers
Odd leg calipers

Oddleg calipers or Oddleg jennys, as pictured at left, are generally used to scribe a line a set distance from the edge of workpiece. The bent leg is used to run along the workpiece edge while the scriber makes its mark at a predetermined distance, this ensures a line parallel to the edge. Download high resolution version (1923x1149, 429 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ... Download high resolution version (1923x1149, 429 KB)Photograph taken by Glenn McKechnie on the 24th March 2005. ...


The uppermost caliper has a slight shoulder in the bent leg allowing it to sit on the edge more securely, the lower caliper lacks this feature but has a renewable scriber that can be adjusted for wear, as well as being replaced when excessively worn.


Vernier caliper

A vernier caliper
A vernier caliper

A variation to the more traditional caliper is the inclusion of a vernier scale, this makes it possible to directly obtain an accurate measurement. Image File history File links Download high resolution version (1000x1000, 143 KB) Beschreibung: Nonius eines Messschiebers Aufnahmedatum: 18. ... Image File history File links Download high resolution version (1000x1000, 143 KB) Beschreibung: Nonius eines Messschiebers Aufnahmedatum: 18. ... A vernier scale lets one read more precisely from a measurement scale. ...


Vernier calipers can measure internal dimensions (using the uppermost jaws in the picture at right), external dimensions using the pictured lower jaws, and depending on the manufacturer, depth measurements by the use of a probe that is attached to the movable head and slides along the centre of the body. This probe is slender and can get into deep grooves that may prove difficult for other measuring tools.


The vernier scales will often include both metric and imperial measurements on the upper and lower part of the scale. The metre is the basic unit of length in the International System of Units (SI: Système International dUnités). ... This article is about post-1824 Imperial units, please see also English unit, U.S. customary unit or Avoirdupois. ...


(A more accurate instrument used for the same purpose is the micrometer.) A micrometer is a widely used device in mechanical engineering for precisely measuring thickness of blocks, outer and inner diameters of shafts and depths of slots. ...


Dial caliper

Mitutoyo dial caliper
Enlarge
Mitutoyo dial caliper

A further refinement to the vernier caliper is the dial caliper.


In this instrument, a small gear rack drives a pointer on a circular dial. Typically, the pointer rotates once every inch, tenth of an inch, or 10 millimetres, allowing for a very accurate and direct reading without the need to interpolate a vernier scale (although one still needs to add the basic inches or tens of millimeters value read from the slide of the caliper). The dial is usually arranged to be rotatable beneath the pointer, allowing for easy "differential" measurements (the measuring of the difference in size between two objects, or the setting of the dial using a master object and subsequently being able to read directly the plus-or-minus variance in size of subsequent objects relative to the master object). Spur gears found on a piece of farm equipment. ... A dial is a generally a flat disk, often with numbers or similar markings on it, used for displaying the setting or output of a timepiece, radio or measuring instrument In telephony and telecommunications in connection with a telephone, a dial refers, in older telephones, to a rotating disk with...


The slide of a dial caliper can usually also be locked at a setting using a small lever; this allows simple go/no-go checks of part sizes.


Digital caliper

A refinement now popular is the replacement of the analog dial with an electronic digital display. This version of the caliper finally allows simply reading the value directly from a single display. Many digital calipers can also be switched between metric and English units and all provide for zeroing the display at any point along the slide, allowing the same sort of differential measurements as with the dial caliper but without the need to read numbers that may be upside down. Digital calipers may also contain some sort of "reading hold" feature, allowing the reading of dimensions even in very awkward locations where the display cannot be directly seen. Two digital voltmeters The field of electronics is the study and use of electronic devices that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. ... A display device is a device for visual presentation of images (including text) acquired, stored, or transmitted in various forms. ...


Like dial calipers, the slide of a digital caliper can usually be locked using a lever.


  Results from FactBites:
 
Caliper - Wikipedia, the free encyclopedia (1039 words)
The tips of the caliper are adjusted to fit across the points to be measured, the caliper is then removed and the distance read by measuring between the tips with a measuring tool, such as a ruler.
The caliper's opening is then either measured on a separate ruler and then converted to the actual distance, or it is measured directly on a scale drawn on the map.
Vernier calipers can measure internal dimensions (using the uppermost jaws in the picture at right), external dimensions using the pictured lower jaws, and depending on the manufacturer, depth measurements by the use of a probe that is attached to the movable head and slides along the centre of the body.
  More results at FactBites »

 
 

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