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2. Engineering fit - Wikipedia

   en.wikipedia.org/wiki/Engineering_fit

   Engineering fits are generally used as part of geometric dimensioning and tolerancing when a part or assembly is designed. In engineering terms, the "fit" is the clearance between two mating parts, and the size of this clearance determines whether the parts can, at one end of the spectrum, move or rotate independently from each other or, at the other end, are temporarily or permanently joined.

3. Constant-velocity joint - Wikipedia

   en.wikipedia.org/wiki/Constant-velocity_joint

   Constant-velocity joint. A constant-velocity joint (also called a CV joint and homokinetic joint) is a mechanical coupling which allows the shafts to rotate freely (without an appreciable increase in friction or backlash) and compensates for the angle between the two shafts, within a certain range, to maintain the same velocity.

4. Differential (mechanical device) - Wikipedia

   en.wikipedia.org/wiki/Differential_(mechanical...

   Differential (mechanical device) A differential is a gear train with three drive shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others. A common use of differentials is in motor vehicles, to allow the wheels at each end of a drive axle to rotate at different speeds while cornering.

5. Shaft alignment - Wikipedia

   en.wikipedia.org/wiki/Shaft_alignment

   Shaft alignment. Workers are checking the alignment of a turbine shaft at the top of the guide bearing at the Watts Bar Dam, Tennessee, USA. Shaft alignment is the process of aligning two or more shafts with each other to within a tolerated margin. The resulting fault if alignment is not achieved within the demanded specifications is shaft ...

6. IT Grade - Wikipedia

   en.wikipedia.org/wiki/IT_Grade

   An IT grade is an internationally accepted code system for tolerances on linear dimensions. Such code systems may be used to produce interchangeable parts. In engineering, the word tolerance refers to a range of allowable dimensions or values. Standard tolerance grades are a group of tolerances for linear sizes characterized by a common identifier.

7. Key (engineering) - Wikipedia

   en.wikipedia.org/wiki/Key_(engineering)

   Key (engineering) In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. The key prevents relative rotation between the two parts and may enable torque transmission. For a key to function, the shaft and rotating machine element must have a keyway and a keyseat, which is a slot and pocket in ...