We can manufacture spur gears from 3mm diameter, up to 3 metre diameter , 0.2 mod thro 25 mod and all imperial (D.P) equivalents.
Spur gears are the most common type of gear they have straight teeth and are mounted on parallel shafts. Sometimes, many spur gears are used at once to create very large gear reductions.
The main reason for the popularity of spur gears is their simplicity in design, easy manufacturer and maintenance. However due to their design spur gears create large stress on the gear teeth.
Spur gears are known as slow speed gears and are seen as noisy due to their design so if noise is not a problem these gears can be used at almost any speed. The reason they are noisy is because every time a gear tooth engages a tooth on the other gear, the teeth collide, and this impact makes a noise.