Manufacturing And Production Technology
Allowance in limits and fits refers to

Minimum clearance between shaft and hole
Difference between maximum and minimum sizes of shaft
Maximum clearance between shaft and hole
Difference between maximum and minimum sizes of hole

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Manufacturing And Production Technology
The grooving is an operation of

Beveling the extreme end of a workpiece
Embossing a diamond shaped pattern on the surface of a workpiece
Reducing the diameter of a workpiece over a very narrow surface
Enlarging the end of a hole cylindrically

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