The worm gears are made of a special alloy (copper-zinc alloy with additives of aluminum, silicon and manganese). Construction materials The worms are made of case hardened steel with ground bore and worm profile. If you are not familiar with ISO-tolerances please call Framo Morat or the local distributor to get the precise dimensions. The catalog data can be converted into 'English measures' by using the following conversion table: The worm gear drawings show ISO-tolerances like 032H7. Metric conversion table Our standard worm gear sets are primarily designed in metric scales. The efficiency differences due to the modification of the pressure angle are negligible. This reduces the bending stress of the worm shaft and the pushing away of the associated worm gear, reducing the noise and increasing the service life. A pressure angle of 15° allows more favourable radial force component conditions. The pressure angle is generally 15° and therefore deviates from the DIN standard of 20°. Pressure Angle Due to the manufacturing process, the teeth have a K flank shape. Depending on the transmission ratio, tooling will have to be procured first. The worm gear sets are usually right-handed but can be produced left-handed on request. Our factory can calculate and manufacture centre distances and transmission ratios deviating from the Framo Morat standard, although it will not always be possible to use available gear cutting tools.
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Our catalogue worm gear sets are generally available in a wide range of centre distances and transmission ratios directly from stock. Besides our catalogue worm gear sets (made to the Framo Morat standard), which we keep in stock in moderate quantities, we also manufacture customised worm gear sets in compliance with customer specifications. In recent decades Framo Morat worm gear sets have won appreciable market shares both in Germany and abroad. Worm gear sets (StFramoMorat *J Franz Morat Group Catalogue worm gear sets and customised worm gear sets Advanced production methods combined with years of experience in manufacturing gears and providing customers with sound advice have made Framo Morat's worm gear sets a byword for quality.