Chapter LXVII: Section 77: Spindles and Centres

=1347. Spindle= with sunk end bearings.

=1348. Spindle= with one sunk bearing and one collar.

=1349. Plain spindle= with two loose collars. Where pedestals with loose caps are used (see Section 46) the collars may be solid with the spindle, but with a long shaft the collars should be at one end only as shown, to allow of expansion. A wheel frequently occupies the place of one or both collars, and serves the same purpose.

=1350. Coned centre,= fixed.

=1351. Collar centre pin or stud bolt,= fixed.

=1352. Coned centre= for roller or similar detail, driven in place.

=1353. Parallel centre= for roller or similar detail, keyed in place.

=1354. Square centre= for crane barrel, &c. See Nos. 634 and 635.

=1355 & 1356. Lathe headstock spindles,= solid or hollow; sometimes made with conical and sometimes with parallel necks.

=1357. Conical crane post.=

=1358. Conical cart axle.=

=1359. Universal centres,= employed to allow of a machine (or part of ditto), such as a drill, to be adjusted at any possible angle, the machine being fixed to one end of bar ~A~.

=1360. Railway carriage axle.= For cranked axles, see Section 10.

=1361. Square neck centre bolt.= The square neck prevents the bolt turning and loosening the nut.

=1362. Coned and cottered crank pin= or centre, sometimes secured by a nut, as No. 1350.

=1363. Centre pin and bracket,= adjustable to various angles.

=1364 & 1365. Two methods of securing end of rod to any solid part of machine;= used for steam hammer heads.

=1366. Hollow post centre,= with water or steam channel to allow for swivelling.

=1367. Group of sleeve centres,= employed to allow of several pairs of lever or wheel motions being taken independently on a single shaft.

=1368. Ordinary centre pin,= with nut, washer, and split pin.

=1369. Ordinary centre pin,= with split pin and washer.

Section 78.--SCREW GEAR, BOLTS, &c.

=1370. Square thread screw.= Single, double, or multiple thread.

=1371. ~V~ thread screw.=

=1372. Enlarged section of ~V~ thread.=

=1373. Strongest thread= when the strain is always in one direction.

=1374. Round thread screw.=

=1375. Geared thread,= to be used with ordinary wheel teeth, the section of thread being that of a rack of the same pitch as wheel.

=1376. Earth screw,= screw pile, screw mooring, earth borer. See No. 530.

=1377. Fixed screw,= with hand wheel to revolve the nut, the screw having no rotation.

=1378. Conical screw;= used for chucks, &c. With two, three, or more sliding jaws chased to fit the conical thread.

=1379 & 1380. Differential screws.= One fixed, the other revolving, impart a motion equal to the difference of pitch of the two screws (see