Hub-bor′er.
(
Wheelwrighting.) An implement or machine for boring hubs for the boxing or the spokes.
That in
Fig. 2602 is for the former purpose.
Clamps at each end of the hub form guides for the central shaft, which has a box to carry the cutter, whose progression is obtained by the thread on the shaft.
The cutter has a threaded shank, and is fed outward to enlarge the diameter of the bore by the rotation of the tube, which has a crownwheel engaging a pinion-nut on the toolshank.
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Hub and felly borer. |
Fig. 2603 shows two machines; one for boring hubs for spokes, the lower one for boring fellies.
A tool operated by a suitable handle is arranged to slide longitudinally in bearings secured to the face of a disk, which may be so adjusted as to hold the tool at any desired angle.
The lower figure shows a sliding cross-piece provided with two arms which are adjusted to hold the felly
Y in position while being bored by a set screw having a handle.
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Hub-boring machine. |