The worm gears made by EP are square and are considerably versatile for installation. The machining of the components, completed using numeric control machines, guarantees maximum precision for the restricted tolerances, generating a CHM – WORM GEARED MOTORS AND WORM GEAR UNITS product which will remain reliable over time. The groupings are constructed of aluminium casings from sizes 025 to 090, as the sizes 110, 130 and 150 are made from cast iron. All the bodies are painted with RAL 9022 aluminium colour to protect the parts from ageing and also to give better safety against microblowholes that may be present in the aluminium. The gears are given at least one filling plug that’s also used during testing to check for possible leaks. A connection flange allows two gears to become combined in order to obtain high gear ratios. Four sizes of CHPC pre-stage gears can be found to pair with the gears; these are also constructed in aluminium and so are painted just like the worm gears
Gears that are supplied with mounting flanges must be assembled with motors whose shaft and flange tolerances match a “normal class” of quality to avoid vibration and forcing of the input bearing. Motors supplied by Chiaravalli Group S.p.A. guarantee that necessity is fulfilled. For simple consultation, the correspondence of the size of the B5 and B14 engine with the sizes of the shaft and the motor connection flange are proven in the following table. Remember that, as the electric motor connection flanges are separate from the body it is also possible to get a shaft / flange mixture that will not match the table, electronic.g. 19/140, therefore offering adaptability for additional non-unified models such as the brushless or direct current types.