The worm gears made by EP are square and so are considerably versatile for mounting. The machining of the parts, carried out using numeric control devices, guarantees optimum precision for the restricted tolerances, making a product that will remain reliable as time passes. The groups are constructed of aluminium casings from sizes 025 to 090, while the sizes 110, 130 and 150 are made from cast iron. All of the bodies are painted with RAL 9022 aluminium colour to protect the parts from ageing and also to give better protection against CHM – WORM GEARED MOTORS AND WORM GEAR UNITS microblowholes that may be present in the aluminium. The gears are given at least one filling plug that’s also used during tests to 
check for feasible leaks. A connection flange allows two gears to be combined to be able to obtain high equipment ratios. Four sizes of CHPC pre-stage gears can be found to pair with the gears; these are also constructed in aluminium and are painted like the worm gears
Gears that are given mounting flanges must be assembled with motors whose shaft and flange tolerances correspond to a “normal class” of quality to avoid vibration and forcing of the insight bearing. Motors supplied by Chiaravalli Group S.p.A. guarantee that this requirement is fulfilled. For simple consultation, the correspondence of the size of the B5 and B14 motor with the sizes of the shaft and the engine connection flange are demonstrated in the following table. Remember that, as the engine connection flanges are separate from the body it is also possible to have a shaft / flange mixture that does not correspond to the table, electronic.g. 19/140, therefore offering adaptability for additional non-unified models like the brushless or immediate current types.
