ESTABLISHING GEAR TOOTH SURFACE GEOMETRY AND NORMAL DEVIATION - PART I - CYLINDRICAL GEARS

This part reports a preliminary work wherein spur and helical gears ar e established from first principle using the concept of tangent line a nd plane, respectively. The coordinates of the ideal surfaces are obta ined which can be verified on a Coordinate Measuring Machine. From the measurements, the normal deviations from ideal surfaces can be obtain ed by the method proposed in this paper. This method is validated by i ntroducing a known error at a specific point on the ideal surface. Sig nificance of the normal deviation method proposed is brought out by co nsidering crowned helical gear surface. (C) 1998 Elsevier Science Ltd.