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A mandrel, mandril, or arbor is a tapered tool against which material can be forged, pressed, stretched or shaped (e.g., a ring mandrel - also called a triblet [1] - used by jewellers to increase the diameter of a wedding ring), or a flanged or tapered or threaded bar that grips a workpiece to be machined in a lathe.
The mandrel, with or without ball with spherical links, is mostly used to prevent wrinkles and ovalization. For relatively easy bending processes (that is, as the difficulty factor BF decreases), the tooling can be progressively simplified, eliminating the need for the axial assist, the mandrel, and the wiper die (which mostly prevents wrinkling).
This yields closeness-of-fit results comparable to that of two accurately-flat pieces, without quite the same degree of testing required for the latter. Schematic of two-piece lapping. One complication in two-piece lapping is the need to ensure that neither piece flexes or is deformed during the process.
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.
About Ring Precision Founded in 1946, Ring Precision specializes in the design and manufacture of high-quality precision round tooling, punches, and dies. With a strong reputation for excellence and decades of experience, Ring Precision delivers solutions that meet the demanding standards of diverse industries, including medical devices ...
In precision mechanics, fit refers to the degree of 'looseness' with which a shaft is inserted into a bored hole. This coupling is related to the tolerance or allowance of both parts' dimensions. The shaft and the orifice must be of a similar diameter, otherwise there will not be a correct adjustment.
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