The worm gears created by EP are square and are considerably versatile for mounting. The machining of the parts, carried out using numeric control machines, guarantees maximum precision for the restricted tolerances, producing a product that will remain reliable as time passes. The groupings are constructed with aluminium casings from sizes 025 to 090, as the sizes 110, 130 and 150 are produced from cast iron. All the bodies 
are painted with RAL 9022 aluminium colour to protect the parts from aging and to give better safety against microblowholes which may be within the aluminium. The gears are CHM – WORM GEARED MOTORS AND WORM GEAR UNITS supplied with at least one filling plug that is also used during tests 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 are available to set with the gears; they are also constructed in aluminium and are painted just like the worm gears
Gears that are supplied with mounting flanges should be assembled with motors whose shaft and flange tolerances correspond to a “normal course” of quality in order to avoid vibration and forcing of the insight bearing. Motors supplied by Chiaravalli Group S.p.A. guarantee that this requirement is fulfilled. For ease of consultation, the correspondence of the size of the B5 and B14 engine with the sizes of the shaft and the motor connection flange are demonstrated in the next table. Understand that, as the electric motor connection flanges are separate from the body it is also possible to possess a shaft / flange mixture that will not correspond to the table, e.g. 19/140, therefore offering adaptability for various other non-unified models such as the brushless or direct current types.
