Discussion
A work piece is to be firmly held in a fixture. It is to be machined by using a plain slab milling cutter as shown in the figure below.
Which one of the following options is the most suitable value of height H of the fixture in mm?
Answer: A
The most suitable height is 200 mm.
A fixture should grip the work piece as high as possible, close to where the cutting forces act, to resist the push of the cutter and limit vibration. But it must stay below the top surface of the 205 mm work piece, or the slab milling cutter would cut into it.
200 mm meets both needs, sitting just below the top surface. 210 mm is taller than the work piece and would foul the cutter. 150 mm and 70 mm leave a long unsupported length above the fixture, so the work piece would not be held firmly against the cutting forces.
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