The trick to keep the dressing low as possible is applied :
Picture the wheel turning along with y-axis(thats the one moving from left to right ,wright ?) and the wheel being one inch wide maybe ten inch diameter. The cuttting dept is adjusted by Z just enough to grind a couple a 0,01" of the top ,the workpice is fed into the wheel by the X-axis just a couple o 0.1" and the the y(from left to right i hope) is used to complete the first cycle of flatgrinding a workpiece.If you repeat this cycle over again the load will be evenly devided over grindingstone full-width resulting in minimum wear on the last part of the grindingstone to cut and maximum wear on the first part of the grinding stone wich entered the workpiece in the beginning.
this was discussed an photographed before so a search should make it clear.
Finally CHIPS you can have as much as you can without the doc. complainting about your cholesterol.