The proper rate of travel for the diamond across
the face of the grinding wheel depends upon three factors:
- The grain of the wheel - coarse or fine
- The grade of the wheel - hard or soft
- The required finish on the part
The correct speed for the desired finish can best
be determined by experiment. The operator must find the best traverse rate that is somewhere between the two extremes
- Fast cross-travel produces a free-cutting wheel
but too fast may leave diamond marks on the wheel.
- Slow gross-travel creates a good finish but too
slow may glaze the wheel.
Initial traverse rates can be calculated using overlaps.
Consider if the width of the diamond at the dressing depth and calculate the number of overlaps per rotation of
the grinding wheel. There should be 2-3 overlaps for roughing and 4-6 overlaps for finishing. Typical roughing
feed rates for wheel speeds of 6000 SFM are:
- 3 to 6 inches per minute for roughing
- 1 to 2.5 inches per minute for finishing