Turning Balls; Turned Boxes - Craftsman 113.228162 Owner's Manual

/
Another method of turning a ring makes use of a recessed
chuck• The work stock is mounted on a screw center and
one half of the ring is formed; but the ring is not cut away
from its center, The stock is then removed, and a recessed
chuck -- mounted on the large faceplate -- is prepared to
receive the ring in a tight press fit. After being chucked, the
remaining face of the ring can be turned to the proper
contour, thus cutting away the center portion. In work of
this type take constant measurements -- or better still, use
a template -- to guard against over or under cutting,
1 Z 3
TURNING BALLS
Wooden bails of large size are first roughiyturned between
centers, using standard procedures, Smaller balls can be
mounted as faceplates on the small faceptate or screw
center. Lines drawn to indicate the center and ends of the
ball shape are heipful in plotting the curve. A template
should always be used for accurate visual observation of
the work progress.
If the ball is mounted as a faceplate turning, almost the
entire surface can be turned before it becomes necessary to
rechuck it. Rechucking can be accomplished in a deep cup
chuck which wil! hold the finished portion of the bail in a
tight press fit. Another method of rechucking is to use a
shallow cup chuck which wilt not support the bail alone, but
must be used in conjunction with the tailstock. When using
the shallow chuck, a wood block is fitted to the tailstock so
that the ball can revolve upon it. This block should be
lubricated with beeswax or grease• In using the shallow
chuck method, the ball is constantly shifted -- never more
than 1/8 turn -- and always with a definite system. Since
turning between centers makes the work a perfect sphere
across the grain, the ball must be mounted in the chuck so
that the first scraping cuts will round it up in the opposite
direction.
/,
f
\
DEEP CUP CHUCK
WOODBLOCK
SCREW
CENTER
B.B. TAILSTOCK
CENTER
SHALLOW CUP CHUCK
TURNED BOXES
Turned boxes involve deep recessing together with a
special system of working the lid and body of the box
together as one unit. The inside of the lid is turned first.
Next, the inside of the body is turned. A careful check must
be made when turning the lip of the body portion so that the
lid will be a tight press fit. The lid is then pressed onto the
body anc_ the outer circumference and face of the tid,
together with the outer circumference of the body, are
turned atl at one time. This insures accurate matching of
the two pieces. After the work is complete, the tight fit of the
lid can be relieved by sanding the lip of the body.
LtD .... "_
L i ii
BACKING BLOCK
FAC_E _
_s _ _:
PLATE
i--
[..L.
27