|Relocating the Busker Hand Crank
I have attached a neck strap to my recently completed John Smith
Busker Organ and found the organ must be pushed out and to the right of the
body while cranking.
To make cranking the Busker more convenient I decided to move the cranking
handle to the side using two 90° nylon gears. The two photos illustrate
how to relocate the crank handle.
The two gears were purchased from McMaster-Carr in Atlanta, Georgia, USA
for $3.17 each. They are number 7297K16, molded nylon 20° pressure angle
miter gears, 24 pitch, 30 teeth, 1.25" pitch diameter, with ¼" bore.
First I removed the ¼"crankshaft from the organ and shorten the rear
of the shaft to be flush with the rear bearing or plate. Then attached the
driven gear to the shaft with a 3/32" roll pin and reinstalled the crankshaft.
After holding the drive gear in place, measure for the location of the drive
gear flanged bearing. The flanged bearing was made by drilling a ¼"
hole through a 3/8" round piece of steel bolt cut to 1-5/8" long with a steel
washer brazed to the end forming a flange. Since the RPM of the crankshaft
is minimal, steel should make a good bearing after oiling. Brass or aluminum
could be applied here.
Three screw holes are drilled in the flange for mounting through the side
of the organ with an extra piece of wood glued inside to help hold the flange
tightly in place. With trial and error the bearing length is determined by
rotating the drive gear back and forth until the gears turn smoothly. After
determining the position of the drive gear, drill the gear and shaft to install
the roll pin.
The hand crank could have been installed in the middle of the side but the
driven gear would need to be placed between the two crank throws during
construction of the crank shaft. Metal gears could be purchased and used
in place of nylon for $18.17 each.
Cranking it is much more convenient with its new location.