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Figures (3)

Fig. 1
Fig. 1

A multipadded lapping tool is shown raised over a roughed in aspheric plate. During operation, the plate revolves 3 rpm while the upper lapping assembly oscillates once a second, through a stroke of 10–20 mm. The pads are faced with brass washers soldered on. They may be replaced when worn.

Fig. 2
Fig. 2

Closeup view showing the lapping pads at various angles. They articulate on ball and socket joints. One pad has been removed from its plunger. Note the ball on the plunger’s end. The various slope angles of the work are easily taken by these pads.

Fig. 3
Fig. 3

Multihead lowered on Schmidt plate. No plunger is the same distance from center, hence giving overlapping which tends to preclude zoning. Note the various numbers of weights pressing down on different plungers. These plungers are free to slide up and down in hardened bushings. Four empty bushings are shown (they are too near the edge for this plate).

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