Manufacturing And Production Technology
Threading is an operation of

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

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

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

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Manufacturing And Production Technology
Work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles ‘on’ and 2 cycles ‘off’ Power supply is at 50 Hz. Calculate R.P.M. and energy requirement of the above circular electrodes assuming effective resistance between electrodes as 100 ohm.

5.03 rpm, 600 joules
22 rpm, 600 joules
2.17 rpm, 600 joules
6.8 rpm, 6 joules

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