This product
range comprises turned brass pulleys or sheave wheels and
specially made Chloroprene rubber (CR) drive belts.
The belts are square in cross section and are closely
related to those found in mini voice recorders of the tape
variety and many other small mechanisms in audio and video
machines. They will not take on a 'set' (like rubber bands
do) if left stretched permanently for many years so long
as the stretch no more than about 10%. The belts are 0.6mm
x 0.6mm in cross-section. There are 5.5mm, 6.5mm, 7.5mm,
10mm & 12mm ID belts which can be used to make up, for
example, a 3.5:1 reduction when used with a 1.1mm or 1.2mm
root pulley and a 5mm root pulley. The full range of
available pulley root dimension is 1.1mm, 1.2mm, 1.7mm,
3mm, 4mm, 5mm, 6mm 7mm, 8mm & 9mm. The pulleys'
grooves are Vee shaped and the 'root' is the minimum
diameter at the bottom of the Vee. The pulley OD is
generally 1mm larger so for example the 5mm root pulley is
6mm OD and the overall volume taken up by two pulleys and
a belt is smaller than for spur gears or the reduction
better. The 1.1mm root pulley is supplied with a 0.8mm
centre hole to match my micro motors and the 1.2mm with a
1mm centre hole for my midi and mini motors. The other
pulleys have 1.5mm diameter centre hole to match standard
shafting, wheelsets and larger motors like the Mashima
range. The pulleys and belts are available
individually and in two different selection 'sets'.
Drive
Components
Sub-miniature
belt drive - Pulleys & Belts
Please see my ONLINE
SHOP for details of
pricing & postage & packing