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What is Newall system? - Metrology & Quality Control
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Metrology and Quality Control
Q. Newall system is a type of
- Published on 07 Aug 15
a.
bilateral hole based system
b.
limit system
c.
both a. and b.
d.
none of the above
ANSWER: both a. and b.
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Discussion
Sravanthi
-Posted on 26 Oct 15
Newall system is used to standardize limits and fits. This system provides range of clearance, transition and interference fits for sizes upto 12''.
- It is a bilateral hole basis system with 6 grades of shaft tolerance and provides two classes of holes for different degree of precision.
- The Newall system consists of two grades of bilateral holes, two of press fit, three clearance fits and one transition fit.
- Newall system is also a limit system and the limits are given to six classes of shafts. These include F and D for press fit, P for transition fit, XYZ for clearance fit, where F = Force, D = Driving, P = Push, Z = Running, Y = Running, X = Running.
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