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, 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

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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.