As illustrated below, the stiffness of tungsten carbide is about three times higher than that of hardened steel. As an intermediary solution, quills made of Densimet, a tungsten based alloy, can also be recommended. Contrary to tungsten carbide, Densimet can be easily machined. (turning, drilling and tapping).
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Always select the quills as short as possible and as thick in diameter as possible as illustrated on the right.
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Ratio of wheel diameter to workpiece bore diameter
The grinding wheel diameter should measure between 2/3 and ¾ of the work piece bore diameter. If the wheel diameter is larger than ¾ of the bore, the resulting contact area may be too large, the wheel may be pushed away and it may prove difficult to maintain tight bore tolerances.
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Determining the wheel width
In order to achieve tight tolerances and economy of process, the wheel width must be within a reasonable ratio to its diameter. To restrict grinding pressures to acceptable levels, select a ratio between 4/5 and 1 as illustrated below.
bs = 4/5 to 1 x ds
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