ACCURATE – Without error within tolerances allowed, precise, correct,
confirming exactly to standard.
ACME THREAD – A screw thread having an included angle of 29° and
largely used for feed screws on machine tools.
ACUTE ANGLE – An angle which is less than a right angle, 90°.
ADDENDUM – The portion of the tooth of a gear that extends from the
pitch line to the outside.
ALIGN – To bring two or more components of a unit into correct positions
with respect to one another.
ALLOWANCE – The intentional or desired difference between the maximum
limits of mating parts to provide a certain class of fit.
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