DAVENPORT® MULTI-SPINDLE AUTOMATIC SCREW MACHINE, AND REAR WORM DRIVE SHAFT FOR USE THEREIN

摘要

A rear worm drive shaft (60) for a Davenport® multi-spindle automatic screw machine, comprises: a shaft first part (61) having a portion with a first hardness; a shaft second part (62) having a portion with a second hardness, said second hardness being greater than the first hardness; and a coupling (63) adapted to join the shaft first and second parts in an axially-aligned relation and to prevent relative rotation therebetween. The improved shaft may be changed on a Davenport® screw machine is about one-half hour.