Manufacturing And Production Technology
Calculate the weld per minute, 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.

22 welds/min, 55 mm/min
500 welds/min, 1250 mm/min
3000 welds/min, 75 mm/min
600 welds/min, 1500 mm/min

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

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.
The chips are disposed off easily and do not interfere with the cutting.

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Manufacturing And Production Technology
Lapping is an operation of

Smoothing and squaring the surface around a hole
Sizing and finishing a small diameter hole
Making a cone-shaped enlargement of the end of a hole
Producing a hole by removing metal along the circumference of a hollow cutting tool

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