wheel on the left is a "repaired" winding wheel form a Jaeger LeCoultre
A-10 aircraft clock. These clocks do not have a clutch that
prevent s damage if the winding is forced backwards and these clocks
wind counter clockwise, the opposite of most timepeices. So the
windng wheels are often found with broken teeth or the winding stem is
broken. As you can see, a previous attempt was made to "repair"
the wheel by letting in new teeth. Since these it is nearly
impossible to replace so many teeth with the correct proportions by
hand, the winding action was rough and inconsistent. Parts are not
available and new one had to be made. The prepared steel blank is
on the left.
blank is mounted on an arbor and put in the horizontal mill for cutting
lubricant to protect the cutter.
brass wheels, steel winding wheels have to be hardened and tempered.
is the finished wheel on the mainspring barrel next to the "repaired"
wheel. Operations not pictured were punching the square center
hole and running the wheel through the surface grinder to bring it to
the correct thickness.
is what the setup looks like. You can see the set of dividing
plates to the left of the cutting set up. The correct dividing
plate is mounted on the rear of the headstock. Dividing plates are
discs with accurately located notches evenly spaced around their
circumference. Different numbered plates allow you to cut gears
with different numbers of teeth. Most sets go include plates
between 50 and 100 divisions.