Reference diameter acc. to DIN 5480

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

• Acc. to DIN 5480 table: Here the geometric sizes are determined from the specified reference diameter using Table 1 in DIN 5480.
• Acc.to DIN 5480 formula: Various combinations of geometry sizes can be entered here. The reference diameter can serve as a default or it is calculated on the basis of the other default data.
• The geometry data can be entered freely here without a comparison with the DIN 5480 formulas. The reference diameter is always calculated here. 

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