| 摘要 |
A jig for the accurate and precise measurement of rigid sheet material for making panels for geodesic dome structures. The jig is intended for use in the assembly of geodesic domes of the type having a plurality of generally flat polygonal hub plates and interconnecting struts, each hub having a recessed panel-receiving rabbet in at least some of its edges and each strut having a recessed panel-receiving rabbet in its outer edges. The jig comprises three shoes, each adapted to engage the recessed rabbets of adjacent hubs of an assembled dome which, with their associated struts, define a triangular opening into which a panel is seated to enclose the dome. Each shoe has a length which is the same as the longitudinal back wall of the hub rabbet. The shoes are connected by three elongated bars, each extending between two of the shoes and adjustably fastened thereto. In use, the jig is positioned in a triangular opening with each of the shoes in tight engagement with one of the hub rabbets, and with the interconnecting bars paralleling the struts which interconnect the hubs. The fastening members are tightened to lock the jig into a rigid triangular configuration. The jig is then removed from the assembled dome and positioned on a flat sheet of panel-forming material. A straight line connecting the extremities of the shoes defines a generally triangular area precisely conforming to that defined by the hubs and struts.
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