cam


cam
/kam/, n., v., cammed, camming.
n.
1. Mach. a disk or cylinder having an irregular form such that its motion, usually rotary, gives to a part or parts in contact with it a specific rocking or reciprocating motion.
2. Auto. Slang. camshaft.
v.t.
3. to provide (a machine part or mechanism) with a cam or cams.
[ < D or LG kam, kamm. See COMB1]

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Machine component that either rotates or reciprocates (moves back and forth) to create a prescribed motion in a contacting element (the follower).

Since the shape of the contacting surface of the cam is determined by the prescribed motion and the profile of the follower, cams take various forms. Cam-follower mechanisms are particularly useful when a simple motion of one part of a machine is to be converted to a more complicated prescribed motion of another part, one that must be accurately timed with respect to the simple motion and may include periods of rest (dwells). Cams are essential elements in automatic machine tools, printing machines, sewing machines, and textile machinery.

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▪ machine component
      machine component that either rotates or moves back and forth (reciprocates) to create a prescribed motion in a contacting element known as a follower. The shape of the contacting surface of the cam is determined by the prescribed motion and the profile of the follower; the latter is usually flat or circular.

      Cams are made in a variety of forms, such as: (1) a rotating disk or plate with the required profile; (2) a plate with a groove cut on its face to fit a roller on the follower (face cam); (3) a cylindrical or conical member with a follower groove cut around the surface; (4) a cylinder with the required profile cut in the end (end cam); (5) a reciprocating wedge of the required shape.

      Cam-follower mechanisms are particularly useful when a simple motion of one part of a machine is to be converted to a more complicated prescribed motion of another part, one that must be accurately timed with respect to the simple motion and may include periods of rest (dwells). The motion of the camshaft in an automobile engine, for example, is a simple rotation that bears a fixed ratio to the crankshaft speed, whereas the valve motion produced by the cams is accurately timed relative to the crankshaft rotation and includes dwells during which the valves remain closed. Cams are essential elements in automatic machine tools, textile machinery, sewing machines, printing machines, and many others. If the follower is not restrained by a groove on the cam, a spring is necessary to keep the follower in contact with the cam.

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Universalium. 2010.

Look at other dictionaries:

  • -cam — cam·pa; …   English syllables

  • CAM — CAM …   Deutsch Wörterbuch

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  • cam — adv. 1. Aproximativ, aproape. Cam pe vremea aceea trăia bunicul. ♦ Oarecum, întrucâtva. Căsătoria s a făcut cam pe ascuns. 2. Destul de...; prea. Vremea e cam rece. Haina e cam lungă. – Din camai (înv. şi mai < lat.). Trimis de valeriu,… …   Dicționar Român

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  • Cẩm Lý —   Commune and village   Country  Vietnam Province Bac Giang …   Wikipedia

  • Cẩm Đàn —   Commune and village   Country  Vietnam Province Bac Gian …   Wikipedia

  • CAM — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. {{{image}}}   Sigles d une seule lettre   Sigles de deux lettres > Sigles de trois lettres …   Wikipédia en Français

  • Cam — Saltar a navegación, búsqueda Para otros usos de este término, véase CAM. Cam es un personaje bíblico, hijo de Noé, de cuyos cuatro hijos surgieron pueblos como: Canaán, Mizraim (Egipto) y otros pueblos africanos como Cus y Fut; Flavio Josefo… …   Wikipedia Español

  • Cam — (k[a^]m), n. [Dan. kam comb, ridge; or cf. W., Gael., and Ir., cam bent. See 1st {Comb}.] 1. (Med.) (a) A turning or sliding piece which, by the shape of its periphery or face, or a groove in its surface, imparts variable or intermittent motion… …   The Collaborative International Dictionary of English


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