| 摘要 |
A gem stone facet cutting apparatus is provided to include a cutting wheel rotating in a horizontal plane and supported above a base portion containing a variable speed cutting wheel drive system. A work on which facets are to be cut is supported at the facet angle and work orientation from above in a cantilevered manner from an upwardly extending, horizontally positionable, support column coupled to the base portion. A supporting bracket is coupled to the support column in a selectable vertical position. A pantographic structure is cantilevered, at a first end thereof, from the supporting bracket to extend toward the cutting wheel. A second end of the pantographic structure supports a horizonally extending support arm to which a sleeve member is pivotably coupled by a horizontal trunnion axis transverse to the extent of the pantographic structure. A dop holder is journaled within the sleeve to rotate about a longitudinal axis of the sleeve. Appropriate angular calibrations, indexing, and positional and orientational locking means are provided to readily, repeatably place the work at a desired facet angle and orientation.
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