29
H)
Dressing The Wheel And Correct Treatment Of Dressing Diamond
The diamond is inserted in the dressing device. The sleeve of the device is arranged at an
angle of about 5°, so that, when the diamond loses its keenness, it can be turned in the sleeve,
along with its holder, thus ensuring that there is always a sharp diamond edge available.
Various degrees of roughness can be produced in the ground component by varying the speed
at which the diamond is passed over the grinding wheel.
If there is only about 0.2mm to 0.3mm stock removal, it is advisable to roughen the
grinding wheel. This is done by feeding the diamond in about 0.03mm and turning the
hand-wheel rapidly, so that the dressing diamond moves quickly over the wheel. This makes
the wheel bite well and the stock removal is good.
If the component is to be finish ground to size with the same grinding wheel
, the wheel
must be dressed again, this time slowly in two or three passes, with the diamond fed in only
about 0.01mm.
Frequent light dressing is better for life of the grinding wheel and the diamond than a
heavy cut.
When dressing, the diamond should always be cooled, if possible, but sudden cooling is
dangerous, as it can lead to the diamond being split.
As the diamond is very brittle because of its extraordinary hardness and sensitivity
to even the slightest knock, it cracks easily.
When dressing, begin in the center as the edges are usually worn down more. If dressing is
begun at the worn edges, there is danger of the higher pressure in the center over stressing the
diamond and shattering it.
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