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Surface Grinder Disclosure Number: IPCOM000084378D
Original Publication Date: 1975-Nov-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 45K

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Related People

Robinson, NL: AUTHOR [+1]


A surface contour is defined by a plurality of differently sized radii.

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Surface Grinder

A surface contour is defined by a plurality of differently sized radii.

A contour on the workpiece in Fig. 1 may be defined by radius R(a) from point a and radius R(b) from point b. Points a and b lie on perpendicular lines intersecting adjacent workpiece sides. The contour is formed by the grinder of Fig. 2 which places the workpiece in contact with a spherical cup on a rotating lap wheel. The workpiece may axially move within a slider which, in turn, may swivel on a base. The point at which the slider swivels is determined by the position of a pin in a track on the base.

In Fig. 3, the spherical cup is originally formed to have a radius R(a) from pin position a. This can, for example, be formed by replacing the workpiece with a dressing diamond and swiveling the fixture about point a while the lap wheel rotates. When the workpiece is placed in the fixture and the slider is swiveled about point a, the workpiece surface will assume a spherical contour having a radius R(a). If the slider is then moved to swivel about another point, for example point b, a second radius R(b) from point b will be formed.

If point b is, as shown, along the fixture axis and on the far side of point a (away from the lap wheel), the radius R(b) will be smaller than the radius R(a). The radius R(b) will be larger than the radius R(a) if the swivel point is placed between point a and the lap wheel. Other contours are obtained by placing the swivel pin at points not lying on...