These demountable self-lubricating bushings are available in
standard and short profi les and are ideally suited for running with
commercial and precision posts. They are manufactured from cast
aluminum bronze material and are prefi tted to the same diameter
guide posts to ensure that the bushings and guide posts of the same
diameter are interchangeable.
Self-lubricating bushings contain graphite plugs which are
impregnated with oil. When the bushings reach 80-90°F as a result
of friction between the bushing and guide post, oil is drawn from the
plug thus lubricating the wear surface. A dark smear pattern is created
on the wear surface as the oil and graphite are imbedded into the
bronze or steel grain. This provides the lubrication necessary for
continuous performance of the tool.
Demountable bushings are tap fi t into location and seat fl ush with
the ground face of the punch holder. The bushings are held in place
with toe clamps and screws which provide perfect alignment of the
bushing with the bore perpendicular to the ground surface of the
punch holder. The clamp and screws provide four times the holding
power compared to pressed-in bushings, yet they can be easily
removed and assembled thus simplifying die building and maintenance.
