Manufacturing Engineering : Practice Questions and Answers

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There are six nearest neighbouring atoms for every atom in a simple cubic (SC) unit cell, in other words, every atom in a SC unit cell is surrounded by 6 other atoms, thus coordination number of SC unit cell is is 6.

Grinding ratio = (volume of material removed/volume of wheel wear). G.R is generally between 0.5-10.

Due to the increase in temperature during grinding operation some material get welded again with the chip.

Only small portion of abrasives are involved in grinding process and hence has less material removal rate. Hence grinding is mostly use as a finishing process.

Grinding wheel have negative rake angle and hence have very small material removal rate. Hence grinding is mostly use as a finishing process.

Material removal rate in grinding process is very small. Hence grinding is mostly use as a finishing process. Only small portion of abrasives are involved in grinding process and hence has less material removal rate.

In open structure grinding wheels, during machining of soft work piece material removal rate is large and space for chip flow is also large due to more space between grains of wheel.

In dense structure grinding wheels, during machining of hard work piece material removal rate is small and also wheel has good strength.

In hard grinding wheels, during machining of soft work piece glazing will occur after long time and grains of grinding wheel will be effectively utilized before coming out from the wheel.

In soft grinding wheels, during machining of hard work piece glazing will occur after long time.

Rubber bond grinding wheel is generally used for machining of soft work piece. Fifth place of ISO designation of grinding wheel represents type of bond.

Loading decrease sharpness of grinding wheel, when foreign material comes in between free space of wheel.

Glazing occurs when grinding wheel starts rubbing work piece instead of cutting.

Friability is the ability to fracture under pressure so that when cutting edge become dull, the grain breaks off and exposes new grains which are sharp.

‘8’ represents grain size, which is coarse.

Fifth place of ISO designation of the grinding wheel represents a type of bond and “R” represents rubber.

First place of ISO designation of the grinding wheel represents grain type and “A” represents aluminum oxide.

Fourth place of ISO designation of the grinding wheel represents Structure and “8” comes under open structure.

Fourth place of ISO designation of the grinding wheel represents Structure and “8” comes under open structure.