Determine first the service factor:

fs =	fsm = f1 x f2 x f5 =
	fsm = 1.5 x 1.1 x 1 = 1.65

fs =	fst = f3 x f4 x f5 x f6 =
	fst = 0.75 x 1.2 x 1 x 1 = 0.9

f1: Average load with an electric motor= 1,5
f2: 20 operating cycles per hour = 1,1
f3: Work cycle: 40% = 0,75
f4: Room temperature 30°C = 1,2
f5: Synthetic lubricant = 1
f6: Housing with fan = 1
Therefore fs = fsm = 1.65

The effective input power is:

P1e =	P1 x fs =
	10 x 1.65 = 16.5 kW

and the effective torque is:

T2e =	T2 x fs =
	1100 x 1.65 = 1815 Nm

Tese values correspond to a worm wheel set length of 160 - Ratio 21.5, nominal power 19 kW, torque T2 = 2250 Nm and maximum torque T2 max = 4250 Nm.

EXAMPLE 2
Worm wheel set with the same technical characteristics as in example 1, but the housing does not have a fan and mineral oil lubricant is used.
From table 6 for the 160 size the f5 factor = 1,28 while the f6 factor = 2 (see table 7).

Therefore fs = fst = 2.3.

The effective power is:

P1e =	P1 x fs =
	10 x 2.3 = 23 kW

and the effective torque is:

T2e =	T2 x fs =
	1100 x 2.3 = 2530 Nm

These values correspond to a worm wheel set length of 180 mm, ratio 21.5, nominal power 24.2 kW, torque T2: 2930 Nm. and torque T2 max. = 5400 Nm.

ASSEMBLY
Before assembling, we suggest to heat the wheel to a temperature of approximately 50°C higher than the room temperature in order to assemble it to the hub more easily.
The wheel must be fitted on the hub with a coupling diameter of D₃, which must have slight interference with the wheel. See table 8 for tolerance

They must be fixed in place with calibrated screws, available upon request, as shown in table 9 below. Wheels are supplied with undersized holes.

We are at your complete disposal to calculate and verufy the support bearings needed.

RUN-IN
The life, output and load capacity for a worm wheel set can be increased with an adequate run-in.
Run-in is necessary and therefore must be foreseen during a worm wheel set's assembly phase.

IRREVERSIBILITY
A worm wheel set is irreversible when it is not possible to rotate the worm gear by rotating the wheel.
This situation generally occurs with reduction ratios greater than 60 and in absence of vibrations.
For the inherent problems in this regard, please contact us for suggestions.