Precision matthews PM-1127VFI-LB, Инструкция по безопасности и обучению

Страница: 27 / 34

Lathe Centers
Lathe centers, are the most common devices for supporting
workpieces in the lathe.
Most lathe centers have a tapered point with a 60
° included
angle to fit workpiece holes with the same angle. The workpiece
is supported between two centers, one in the headstock spindle
and one in the tailstock spindle.
Centers for lathe work have standard tapered shanks that fit
directly into the tailstock and into the headstock spindle using a
center sleeve to convert the larger bore of the spindle to the
smaller tapered size of the lathe center.
The centers are referred to as live centers or dead centers. A
live center revolves with the work and does not need to be
lubricated and hardened. A dead center does not revolve with
the work and must be hardened and heavily lubricated when
holding work.
Live and dead centers commonly come in matched sets, with
the hardened dead center marked with a groove near the
conical end point.