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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 ofthe 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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