How To Turn Plastics; Segmented Turnings; Use Of Wood Turning Chisels; Use Of Formed Tools For Production - Craftsman 113.228162 Owner's Manual

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very
i segment pieces for the
sides, Bow ( or 8 pieces if desired. To
make the 12-piece bowl, a board about 7/Bx3x30 in. is cut
into pieces about 2-t !2-in, long, the saw blade being tiffed
15 ° and the board being turned alternately face up and face
down to make the successive cuts. These 12 pieces are
glued together and clamped by wrapping the assembh/with
wire. When dry, the rim thus formed is glued to a temporary
circular backing which _s mounted on the large faceplate.
A recess of the largest possible dia meter, and about 3/4-in.
deep, is turned in the open end of the rim. The rim is
removed from the lathe, and stock for the bottom is
mounted in its palce on a second faceplate. This is turned to
size -- and a rim about 1/8-in. deep is turned to exactly fit
the recess prepared in the rim. The rim is then fitted over
the bottom and glued, making a drum shape with a
faceplate at each end.This dr um is cut completely in two at
a point about 3/4-in. above the bottom -- completing the
cut with a hand saw. Both parts of the cut surface ere faced
off square and smootn -- then reglued together, breaking
the joints exactly half and half. The cutting and regluing
process is repeated with a section about 1-1/4-in. wide.
After this, the temporary backing block is cut off, leaving the
bowl as shown in me finat illustration.
From this point on the work is simply a matter of turning
down the bowl to any desired shape.
HOW TO TURN
TYPES OF PLASTICS
There are two general groups of plastics. The first includes
all phenol plastics moulded under heat and pressure.
Bakelite and Formica are examples. In the second are all
catalyst Setting plastics of various bases sold under such
trade names as Lucite, Catalin, Cast Bakelite, Marblette.
Tenite and Trafford. Those in the second group are most
generally used for craftwork. They are easyto turn, being a
little harder than wood but much softer than any of the soft
metals.
MOUNTING THE WORK
Rods can be mounted between centers, using wood
mounting centers When the spur center is used. slots
should be sawed across the work,
PLASTICS
USE OF WOOD TURNING CHISELS
Standard wood turning chisels are excellent for turning
plastics by means of scrap=rigmethods, The toot rest should
be slightly below center and the chisel handle should be
held a little higher than the cutting edge to give a negative
rake. Scraping tools should be used. The area contacted by
the tool should be kept toe minimum. A large contact area,
such as the full edge of the spear-point chisel, wilt cause
chatter and probable chipping,
Properly worked, the chip comes off in a continuous ribbon,
In cold weather, plastic may become brittle and should be
tempered in warm water for about ten minutes before
turning.
USE OF FORMED TOOLS FOR PRODUCTION
AND SIMILAR OPERATIONS
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