The repository contains the splines and test_splines modules. The former is the splines calculator, which uses the sizes calculation methodology described in ISO 4156-1:2005 and ANSI B92. The splines introduces the Splines class with methods to calculate and print out the key sizes of internal and external splines according to ISO 4156-2:2001 and ANSI B92.
The Splines class is initiated with the string-like spline specification in the format according to either the section 12.3 of ISO 4156-1:2001 or ANSI B92 and the splines length. If not specified, the default length is computed as half pitch diameter.
The example of the input for the external spline calculation would look like: 'EXT 24z x 2,5m x 30R x 5f - ISO 4156'. The print_drawing_data method lists the data required for the uniform spline specification on drawings of the spined components according to the section 12.4 in ISO 4156-1:2001. The test_splines implements the tests of the calculations module by asserting compliance between the sizes computed with the splines module and the sizing calculation examples in appendices to ISO 4156-1:2005.
iso_splines = Splines('EXT 24z x 2,5m x 30R x 5f - ISO 4156', None)
iso_splines.print_drawing_data()
ansi_splines = Splines('EXT FLAT ROOT SIDE FIT 12/24 30T 30 CLASS 5 ANSI B92', None)
ansi_splines.print_drawing_data()