[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.

[Larger plate.]

[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.