[Eighth operation]: Front tool in the carriage chamfers off the end thread.
[Ninth operation]: Back tool of carriage, a parting tool, cuts off the bolt; the left carriage stop determining the proper length of head.
[Tenth operation]: Bolt being reversed in chuck, the top of the head is water cut finished by a front tool in the carriage. This operation is deferred till all the bolts of the lot are ready for it.
Fig. 703.
[Fig. 703] represents a general view of a screw machine designed by Jerome B. Secor, of Bridgeport, Connecticut. The details of the machine are shown in [Figs. 704], [705], [706], [707], [708], [709], [710], and [711].[13] The live spindle is of steel and is hollow, and its journals are ground. The boxes are lined with babbitt, so that no other metal touches the spindle, and may, by a special device, be re-babbitted and bored exactly parallel with the planing of the bed.
[13] From Mechanics.
