Is the coefficient of thermal expansion appr. 4 times higher than bronze. Therefore, the backlash should not be too small. At the temperature limit of 100 ° C the mechanical values ​​drop to 40% of nominal values. The case temperature should not exceed 50 ° C, making the temperature of the gears have more than 70 ° C. market offers a variety of different bronze for worm gears. Some of them are described here. Is “Soft” bronze good for higher speed, ‘is “hard” bronze a lower speed. Can “Move” bronze worm gears paired with unhardened steel worms but that means reductions in torque and life time. Can “Hard” bronze worm gears paired only with hardened steel worms.

Effectiveness generally depends on the following conditions:

• angle as a result of the worm,

• speed running,

• lubrication,

• surface quality,

• mounting conditions.

The efficiency increases with growing distance instead. It can use plain bearings with high coefficients of friction affect overall efficiency. Apply the efficiency values ​​quoted for optimum mounting conditions. Not the lubricating film between the flanks made until running gear. That is the reason for lower starting efficiency (approx. 30% below the efficiency of running).