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When a number of identical pieces are to be produced, all
having a distinctive surface pattern, preformed tools will
speed the work and assure uniformity_ Patterns like those
illustrated can be created by grinding thin (_020 to .010)
gauge aluminum strips. A holder, like the one shown, can
then be used to support any one of your prepared strips
--and guide it against the workpiece.
POLISHING
PLASTICS
Start with sanding.
First use 150-grit
dry paper to remove
tool
mar_s,
then
finish
off with
150-grit
and 400-grit
papers,
in succession,
used
wet.
Press
lightly
to avoid
overheat
ing and marring
of the work. Buffing
gives the final
polish, using the polishing
compounds
commonly
supplied
for this p_rpose.
Do not press too ha rd or hold wheel
at one
spot too long --
keep
moving
around
--
otherwise
the
plastic might become
heat marked.
SANDBNG,
BUFFBNG AND POLISHING
USING
THE LATHE TO SAND TURNINGS
Turnings
should be sanded with the lathe running
in
second towest speed, A large sheet of sandpaper is useful
for smoothing cylinders. All other sanding operations are
done with a narrow
strip
of abrasive paper. The best
finishing
grit is 3/0 for softwoods, 4/0
for hardwoods,
SANDPAPER
PER
COVES
WOOD
FIBERS
SANDPAPER
29
Worn 2/0
paper is often used. and is the equivalent
of 3/0
or 4/0
new paper.
The
application
of the
sandpaper
strip
is shown
in the
illustrations,
Care
must
be exercised
in order
to prevent
dubbing
the
corners
of beads,
shoulders,
etc.
USE OF SANDING
DISCS
A fully adjustable
sanding
table 9-24922
adds to the scope
and convenience
of sanding
operations.
Sanding
is always
done on the down-traveling
side of the wheel;
working
on
the other
s_de would
kick the work
upwards.
Either
second
or third
speed
can be used.
The sanding
disc is a metal
plato
with
a threaded
shank
which
fits the end of the lathe
spindle.
Abrasive
paper
is
glued
to the machined
surface
of the plate
by means
of a
quick-drying
cement
supplied
for this
purpose,
Abrasive
discs
can be purchased
or cut from
the standard
sizes
of
abrasive
paper,
/
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