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SUMMARY
The paper sets out to describe how a servo mechanism may be applied
to generative gear grinding machines and an appropriate specification is
drawn up.
The system involves separate motor drives to the two shafts, the
angular positions of which are monitored with radial diffraction gratings.
One of the signals is frequency divided to achieve the speed ratio between
the two shafts, the resultant similar frequency signals being phase
compared, any difference producing an error signal thus completing the
servo loop. Hydraulic motors are used as prime movers. The transfer
functions of the loop are developed and compared with measured open loop
results. It is clearly shown that with the components at present
available the loop cannot be made stable. The specification of more
appropriate hardware is discussed and future work outlined, but the
conclusion is reached that this system cannot be used for its primary
purpose on a generative gear grinding machine. |
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