PRATT WHITNEY 3B JIG BORER MANUAL
Pratt and whitney #3 jig borer - practicalmachinist
wwwticalmachinist››General - ArchiveOct 08, 2004The Pratt & Whitney Electrolimit Jig Borers were their most modern machines. They were competition to the SIP and they were a bit more rugged. Both the X and the Y travels had infinitely variable milling feeds from 1 to 15 in./min. and rapid traverse of 60 in./min. There is a spindle adaptor that allows the large ones to mount shell milling cutters.[PDF]
Pratt & Whitney Jig Borers Circular 513 - Chudov
Pratt & Whitney have no secrets in manufacturing Jig Borers. If any, the "secret" is in our absolute insistence on precision in every step. The best way for DETAILED a prospective buyer of a Jig Borer to re- alize the high quality of this machine is to see it first-hand. We will be glad to show our shop and our methods without reservations.