Nigel Lawton 009/HOn30/HOe Model Rolling Stock Railway/Railroad Kits and Very Small Motors

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 & 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

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Sub-miniature belt drive - Pulleys & Belts

Pulley Spacing
Please use either of the links below to view tables of pulley size,
reduction ratio and pulley centre/axle spacing.

Click here for a spreadsheet based belt length calculator

Click here for non-functioning PDF version

Note that the reduction ratios in these files are adjusted for the
average effective drive diameter of the pulleys whilst driving the
0.6mm cross-section belt. This results in a reasonably close
reflection of the actual reduction achieved.