divergence of `gearprofile` under certain parameters

[jimy-byerley]

This doesn't work

prof1 = gearprofile(1.9120762662066337, 55, **{'offset': -0.19120762662066337, 'asymetry': -0.2})
prof2 = gearprofile(1.9120762662066337, 55, **{'offset': -0.2, 'asymetry': -0.2})

However this does

prof3 = gearprofile(1.9120762662066337, 55)
prof4 = gearprofile(1, 55, **{'offset': -0.19120762662066337, 'asymetry': -0.2})

the four of them give the following