The worm gears made by EP are square and are considerably versatile for installation. The machining of the parts, completed using numeric control machines, guarantees maximum precision for the limited tolerances, making a product that may 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 manufactured from cast iron. All of the bodies are painted with RAL 9022 aluminium colour to protect the parts from aging and to give better protection against microblowholes that may be within the aluminium. The gears are supplied with at least one filling plug that’s also used during screening to check for possible leaks. A connection CHM – WORM GEARED MOTORS AND WORM GEAR UNITS flange allows two gears to end up being combined in order to obtain high equipment ratios. Four sizes of CHPC pre-stage gears can be found to pair with the gears; these are also built in aluminium and are painted like the worm gears
Gears that are given mounting flanges should be assembled with motors whose shaft and flange tolerances correspond to a “normal class” of quality in order to avoid vibration and forcing of the 
input bearing. Motors given by Chiaravalli Group S.p.A. guarantee that requirement 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 demonstrated in the next table. Remember that, as the engine connection flanges are separate from the body additionally it is possible to possess a shaft / flange mixture that will not match the table, e.g. 19/140, therefore offering adaptability for other non-unified models such as the brushless or direct current types.
