A tool having a coned point for marking the centres to work.
A short reamer that is driven by fitting to a coned mandrel.
This spindle, which runs in two coned bearings, carries at its outer end a light Fig. 34.
It runs in bearings which are split and are coned externally, fitting into correspondingly coned holes in the headstock.
The pins b and g and the coned holes should be of cast steel hardened, so as to avoid wear as much as possible.
The plate may be made of cast iron with hardened steel bushes to fit the coned holes.
It consists of a cylindrical chuck fitting from a to b into the coned hole in the live spindle so as to be driven thereby.
The body d is provided with an annular ring fitting into the bore of the base, which is coned at q.
The mouth of a is coned to receive the arbors or mandrels for driving the mills or cutters.
The sliding half is coned and covered with leather as shown at c c, the outer half being coned to correspond.