Materials Science and Manufacturing Engineering Miscellaneous Easy Questions and Answers

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Materials Science and Manufacturing Engineering Miscellaneous

A non standard thread of pitch 3.175 mm is to be cut on a lathe having lead screw of pitch 6 mm. A change gear set provided with the lathe has one gear each with the following number of teeth: 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 127. The correct pairs of change gears (a/b x c/d) for machining the given thread are (assuming that the transmission ratio of the rest of the kinematic train between the lathe spindle and lead screw is equal to 1),

A side and face cutter 125 mm diameter has 10 teeth. If operates at a cutting speed of 14 m/ min with a table traverse 100 mm/min the feed per tooth of the cutter is

1. grains have become blunt, but do not fall out
1. gap between the grains is filled by dwarf
1. it becomes black due to burning
1. part of the wheel is chipped off

If the index crank of a dividing head is turned through one complete revolution and 10 holes in a 30 hole Circle plate, the work piece turns through (in degrees)

Find the speed range ratio for the drilling machine spindle if the minimum and maximum diameters of drills used are 5 mm and 25 mm respectively and if the mach inability indices for the work materials are 120 (brass) and 40 (alloy steel)

	127	×	20
	30		80

	127	×	20
	40		120

	127	×	30
	20		120

	127	×	30
	50		80