Unova UK Limited

Selwyn Jonathan Griffiths

John David Pickles

A computer controlled grinding machine programmed so as to control the machine by calculating the wellhead demand positions which takes into account the difference in height between the workpiece axis of rotation and the grinding wheel axis of rotation to produce a height adjusted value for P. The following equation is used to compute the position demand values for a crankpin of a crankshaft, namely: P&equals;(T*cos A)&plus;(R&plus;r) &minus;((T*sin A)&plus;H) ), where P is the eight adjusted) demand position of the grinding wheel at each instant; R is the current radius of the grinding wheel; r is the target radius for the crankpin ( ); T is the throw of the crankpin around the main crankshaft axis ( ); A is the angular position of the crankshaft relative to the start position; and H is the vertical height between the two axes (the height error). The value for P is typically calculated for each of 3600 angular positions during one revolution of the crankshaft.

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Nothampton, United Kingdom

Selwyn Jonathan Griffiths