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Duplicate Turnings
Identical turnings require great accuracy
when plotting the work and doing the vari-
ous cuts. Many methods have been
devised to aid in perfecting the work.
Use of Patterns
Professional workers generally use a pat-
tern, or layout board. This is a thin piece
of wood or cardboard on which is drawn a
full- size half section of the turning. The
contour of the finished surface is drawn
first; then the diameters at various critical
points are drawn to scale as vertical lines
intersecting the contour line. By placing
the pattern against the roughed-off cylin-
der, you can quickly mark the various
points of the critical diameters. To make
each sizing cut, use outside calipers and
set these by actually measuring the length
of the vertical line on the pattern which
represents the diameter desired. Then
make the sizing cut, down to the proper
diameter by using the calipers to deter-
mine when the cut is finished. After mak-
ing the sizing cuts, hang the pattern
behind the lathe where it will serve as a
guide for completion of the workpiece.
Using a Template and a Diameter
Board
When many identical turnings are to be
produced, it is a convenience to have a
prepared template. This can be made of
thin wood or cardboard - and is cut on a
band saw or scroll saw to have the exact
contour of the finished turning. The num-
ber one finished turning can also be used
as a template. Attach the template to a
board; then mount the board behind the
lathe, on hinges, so that the template can
be moved down to touch the workpiece
and allow you to closely observe progress
of your work.
If a great many turnings are being pro-
duced, a diameter board will save the
time used for resetting calipers. This is
simply a thin board along the edge of
which a number of semicircular cuts have
been prepared to represent all the various
U
sing a Template Using a
Diameter Board
caliper settings required for measuring
the sizing cuts. Each semicircular cut is
held against the workpiece instead of
using the calipers.
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