Chapter XXX: Section 37: Fastening Wheels to Shafts

Besides the ordinary plan of shrinking them on while hot, the following are the chief devices in use:--

=634. Square shaft and single key.=

=635. Square shaft and two keys= at right angles; two keys should always be used for a square shaft, unless it has been machined to fit to the hole.

=636. Round shaft and hollow key.=

=637. Round shaft and flat key.=

=638. Round shaft and sunk key.=

=639. Staked fastening,= four keys, usually on flats cut on shaft, but better if slightly sunk into shaft.

=640. Set screw.= Cannot be depended on for any but light strains.

=641. Taper pin.=

=642. Split pin;= always used where a pin, bolt, or centre is liable to work loose.

=643. Cotter and slot.=

=644. Screwed pin= through shaft and boss of wheel.

=645. Octagonal shaft of cast iron,= with four keys, or the four keys may be cast on shaft.

=646. Cotter or pin through side of shaft.=

=647. Large wheels= are sometimes wedged with iron and wood wedges all round on a square or octagonal shaft having feathers cast on it.

=648. Set screw,= tapped half into shaft and half into wheel.

=649. Screwed shaft, nut and clamping plates;= used for emery wheels, grindstones, circular saws, and milling cutters.

=650. Screwed end and nut,= the hole in wheel being square, or round and fitted with key.

=651. Gib head taper key.=

=652. Plain taper key.=

=653. Taper round pin.=

=654, 655. Split pins= (round).

=656. Cotter and split pin.=

=657. Cotter and nut.=

=658. Dovetail taper key,= or fixing for projection, cutter or bracket.

=659. Self-locking pin;= cannot work out.

=660. Split collar and ring fastening,= sometimes used instead of a nut and screwed end; the inner ring is in halves.

=661. Piston rod fastening.=

=662. Locking feather and wedge= fastening, for rollers, &c., prevents end motion.

=663. Railway chair key.=