Title: Drilling machine for plaster casts or models

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Abstract: A drilling machine for drilling holes in plaster casts or models has a frame which supports a stationary drilling platform having an opening therethrough. A motor housing is positioned below the drilling platform and is vertically movable between a rest and a drilling position on two laterally disposed top guide shafts and a centrally disposed bottom guide pin. A motor is mounted in the housing and supports a drill chuck and drill bit which penetrates through the opening to drill a hole in a cast or model on the drilling platform when the housing is moved upwardly to its drilling position. A U-shaped handle pivotally mounted on the frame and engageable with the housing permits manual raising of the housing. Alternately, a pneumatic system is described which includes a piston arrangement for raising the housing to the drilling position independently of the position of the handle. During pneumatic operation, the handle may be locked in its rest position. In each case, the handle is disposed in the region of the drilling platform so that the handle and the cast or model may be simultaneously gripped to secure the model during drilling. An overhanging locating light assembly is spaced over the opening of the drilling platform and vertically aligned therewith so that an indication-- a lit portion where the light beam impinges on the model -- is provided where the hole will be drilled. The beam of light from the locating light assembly can also be used for purposes of dental surveying.


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