Reference diameter acc. to DIN 5480

The reference diameter of the spline connection is used to determine the geometry values. The following options are available when creating a new spline connection:

• Acc. to DIN 5480 table: the geometric values are determined from the specified reference diameter using DIN 5480 Table 1.
• Acc.to DIN 5480 formula: various combinations of geometry values can be specified here. The reference diameter can serve as a default or it can be calculated based on the other default data.
• The geometry data can be specified without a comparison with the DIN 5480 formulas. In this case, the reference diameter is always calculated. 

If the reference diameter is changed for a spline that has already been created, only the nominal addendum modification is adjusted. For more significant changes to the reference diameter, the module and/or number of teeth should be adjusted accordingly by the user.