Dwell time calculation for computer controlled large tool
2012
The Computer-controlled Large-tool such as the stressed-lap which firstly developed in the Steward Observatory Mirror
Lab (SOML) [1]and the Computer controlled active lap which developed in the IOE (Institute of Optics and Electronics,
Chinese Academy of Science), those large tools are controlled by computer to manufacturing large optics, especially
for grinding with loose abrasive and polishing with slurry. Comparing the fixed orbital lap, computer-controlled largetool
can bend its lap surface timely to match the local sub-aperture, so it always strike the high area preferentially, due to
its large diameter , computer-controlled large-tool possess highly remove efficiency and generate less middle-frequency
and high-frequency errors comparing some small tools such as computer controlled optical surface (CCOS), but on the
other hand how to calculate the dwell time for those computer-controlled large-tool becomes a challenge comparing
those small tools. Based on the mathematical removal equation for computer controlled active lap we have none negative
least square algorithm to calculate the dwell time, after the simulation, a optimized algorithm based on none negative
least square is provided, the dwell time calculated by this optimized algorithm meet the wanted removal volume with
little residual errors.
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