there is one notable difference. The design must be worked out by eye,
because of the nature of the work no caliper measurements can be made
for depth of cuts.

To get the best results the stock of oval turning should be cut square
or slightly rectangular in cross-section and about 3" longer than the
model to be made. The thickness of the stock should be about 1/8"
greater than the major axis of the oval wanted.

The centers are located in the usual manner after which perpendicular
lines are drawn from the sides, passing through the points of the
centers. From the ends of one of these, perpendicular lines are extended
lengthwise of the stock (on opposite sides) meeting the corresponding
perpendicular at the other end of the stock. These lines form the ridge
of the oval. On the other perpendiculars, the points for off-centering
are laid off, measuring the required distance on both sides of the
center point.

With a 1/8" drill bore holes 1/4" deep at each of the off-centering
points as well as the original center. This will insure the lathe
centers penetrating the stock at the proper point. The stock is then
placed in the lathe, using two corresponding off-center points as
centers.

With the lathe running at third speed turn down the stock to the
horizontal line forming the ridge of the oval, excepting for a distance
of about 1-1/4" at the ends. The stock at the ends is necessary for the
off-centering and, if cut away, will spoil the centering for the other
side, especially at the live center end. The stock is then changed to
the other off-center points and the second side is cut down to the line.