Drive and tensioning drums; versions and their characteristics

Drive drums
A drive drum is always manufactured with a welded spindle, which is stepped down to a given size of bearing and where necessary fitted with a plug with a key-way.

Tensioning drums
A tensioning drum can be manufactured with a fixed welded spindle or with internal bearings. In the fixed version, the spindle can be stepped down to a given size of bearing. The spindle with internal bearings can be manufactured with e.g. exterior flats or internal thread.

Spindle length max.
Common spindle sizes
Tube diameter max.
Common tube sizes

2000 mm
ø 20 mm, ø 25 mm, ø 30 mm, ø 35 mm, ø 40 mm, ø 45 mm, ø 50 mm, ø 55 mm
ø 300 mm
ø 82.5 x 3.2 mm, ø 89 x 4.9 mm, ø 101.6 x 3.6 mm, ø 108 x 5.0 mm, ø 133, 4.0 mm, ø 152 x 4.5 mm,
ø 159 x 4.5 mm, ø 177.8 x 5.0 mm, ø 203, 6.3 mm, ø 219 x 6.3 mm

Crowning
To help the tracking of transport belts, drums can be crowned. This means that both sides are turned until conical by 1% of the drum diameter. A table with the proportions d:c:d is given below.