Tolerance recommendations for

Symbol	-
Unit	-
Attribute-ID	din_5466_part1_2000_type_of_centering
Numeric ID	17081
Value Type	PMString

According to DIN 5480 Part 1, the centering of the splines is classified on the basis of the function of the spline for transmitting the torque and for centering the rotor on the shaft.

Flank-centered connection: The flanks of the teeth serve to transmit the forces as well as to center the hub and shaft relative to one another. The fit and the centering accuracy are determined by the deviations of the space widths and thicknesses as well as by the tolerances achieved or specified.
Diameter centered connections: The toothing is only used to transmit torque.
- Outer diamter centered: Diameter-centered connections which are centered on the outer diameters (hub root circle diameter and shaft tip circle diameter = outer diameter centering)
- Inner diameter centered: Diameter-centered connections which are centered on the inner diameters (hub tip circle diameter and shaft root circle diameter = inner diameter centering)

Note: If diameter centering is selected, the gear geometry cannot be determined according to the tooth heights specified in DIN 5480 for the individual manufacturing processes. In this case, the tooth profile must be defined with user-defined tools. Recommendations are issued for the diameters to be selected and the tolerance zones in accordance with DIN 5480 Part 1 Table 5. Depending on the type of centering, the respective root circle diameter is selected as the centering diameter, as this is usually determined by the tooth width dimensions and cannot be subsequently machined to achieve the desired tip clearance.

The easiest way to define an outer diameter centered spline connection is to define a tool with a large dedendum factor for the toothing of the shaft and to specify the recommended tip circle diameter directly on the gear in accordance with DIN 5480 Part 1 Table 5 (see above). The toothing of the hub can still be calculated according to the standard without a tool definition. For an inner diameter centered spline conection, the same procedure applies to the toothing of the hub.