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
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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!
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1.2mm root pulley
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1.7mm root pulley
8mm root pulley
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10mm ID drive belt
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12mm ID drive belt
Please see my ONLINE SHOP for details of pricing & postage & packing
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7mm root pulley
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9mm root pulley
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Nigel Lawton 009
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7mm Scale 20HP WD Simplex Loco
4mm Scale 20HP WD Simplex Loco
O&K RL1c Loco
Meridian MPD18 Chassis
W. G. Allen Vee Tipper
Japanese Vee Tipper
Micro Motor (6mm x 12mm)
Micro Motor (6mm x 10mm)
Midi Motor (8mm x 16mm)
Mini Motor (10mm x 12mm)
Alumilite Casting Materials
Greenwich Coupling
Drive Components, Gears, Pulleys,
Belts, Shafts, Shaft Adapters, Friction
Prototype tipper Pictures
Vee Tipper Pictures
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A Modeller's Toolkit
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Whitemetal Casting for Beginners -
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Resin Casting for Beginners - The
Personal Layouts
4mm root pulley
6mm root pulley
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Pulley & Belt Set 1
Pulley & Belt Set 2
Please visit my online shop to purchase these items
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