Manufacturing And Production Technology
In an interchangeable assembly, shafts of size 25.000 -0.0100⁺⁰∙⁰⁴⁰ mm mate with holes of size 25.000 -0.010⁺⁰∙⁰²⁰ mm. The maximum possible clearance in the assembly will be

30 microns
60 microns
20 microns
10 microns

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Manufacturing And Production Technology
Which of the following statement is wrong as regard to down milling?

The coolant can be poured directly at the cutting zone where the cutting force is maximum.
The chips are disposed off easily and do not interfere with the cutting.
It can not be used on old machines due to backlash between the feed screw of the table and the nut.
The surface milled appears to be slightly wavy.

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Manufacturing And Production Technology
Threading is an operation of

Smoothing and squaring the surface around a hole
Cutting helical grooves on the external cylindrical surface
Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool

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