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%. At present I have 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, 5mm, 7mm & 9mm. The pulleys' grooves are Vee shaped and the 'root' is the minimum radius at the bottom of the Vee. The pulley OD is generally 1mm larger so for example the 5mm root pulley is only 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.  All five sizes of pulley and five sizes of belt are currently available in my online shop
Drive Components
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Sub-miniature belt drive - Pulleys & Belts
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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.
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1.1mm root pulley
5.5mm ID drive belt
3mm root pulley
6.5mm ID drive belt
5mm root pulley
7.5mm ID drive belt
Friction Drive
Click here for a friction drive application note
7mm OD friction wheel
Click here for a very ingenious belt drive application for 4mm scale standard gauge! http://www.clag.org.uk/axle-hung.html
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1.2mm root pulley
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1.7mm root pulley
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10mm ID drive belt
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12mm ID drive belt
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Nigel Lawton 009
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Nigel@NigelLawton009.com
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7mm root pulley
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9mm root pulley