Strasbaugh nTellect (Model 7AF) Wafer Grinder
8 - 12 Version 1.2 - June 2004
Notes on Spindle Height and Probe Position Displays:
When the machine is first powered up, homing zeros out the screen readout for spindle
height at the limit switch located at the top of the stroke.
During homing, the location of the top of the work chuck is determined by counting,
beginning with zero, from the limit switch to the work chuck. The work chuck
location is lost after homing (a) due to wheel wear if the machine has been processing
wafers or (b) if the grind wheels or chucks have been dressed.
After referencing, the zero point is reestablished at the work chuck.
After power up and the initial referencing, for subsequent referencing, the count is
upward from the work chuck beginning with zero.
Upward movement of the spindles is always positive; downward movement is
always negative.
Note that negative numbers are always displayed in RED at the screen readout.
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