Bonfiglioli has long been identified as one of the premier manufacturers of wormboxes, due to both the size of the range and the quality of materials used. The wormscrew is made by a case hardened and hardened drop forging of 16CrNi4 UNI with a ground flank to increase efficiency. The wormgear is made by bronze casting G-Cu Sn 12 UNI 7013-2 cast on a spheroidal graphite cast iron hub.
Bonfiglioli VF Range
For many years, the Bonfiglioli wormbox range consisted of ‘VF’ series units exclusively, where mounting position was dependent upon foot orientation. Changing the mounting position (or mounting an output flange) required the side covers to be removed and replaced. This was laborious, although did allow for any mounting position required.
Historically, these VF sizes included:
Bonfiglioli W Range
Continued product development saw the ‘W’ series introduced, replacing some of the VF sizes. The W series is identifiable by rectangular dimensions and a myriad of mounting holes.
The W series of wormboxes allows for modular mounting, which means that feet orientation no longer has to be considered. Output flanges and torque arms are also easily fitted, without needing to remove sideplates. This further expands the range of mounting options.
Where the W series is replacing an existing VF series unit, external feet (identified as KA followed by the gearbox size) can be fitted to ensure that the shaft centre height of the replacement gearbox matches the original, as well as the original bolt hole pattern.
Some of the original Bonfiglioli VF series units that have been superseded are still manufactured for specific OEM clients, although support for the range is dwindling, with most of the focus now being directed toward the W series.