I would have done something like this:

#declare contact_pin =
intersection {
    union {
        difference {
            torus { 0.015625, 0.0078125 translate 0.0234375*y }
            cylinder { <0.0, 0.0234375, 0.0> <0.0, 0.046875, 0.0> 0.046875 }
            }
        cylinder { <0.0, 0.0234375, 0.0> <0.0, 0.078125, 0.0> 0.0078125 }
        }
    cylinder { <0.0, -0.015625, 0.0> <0.0, 0.09375, 0.0> 0.0234375 }
        texture { T_Gold_5A }
    }

Regards,

        Anthony D. Baye



> High!
>
> Currently, I'm modeling an ancient mathematical co-prozessor... and with
> its pins, a problem occurred. As they are somehow soldered to the
> ceramic die's lower side, there is a smooth transition between the pin
> itself and its flat round base. Any attempts to model this with blobs
> resulted in monstrously swollen base cylinders, so I decided to do it
> with a lathe, using Moray.
>
> But when viewed from along the z axis, the lathe turns out to be
> asymmetric (see picture)! Did this result from the fact that I did not
> specify a fourth point on the y axis?
>
> Here is the code:
>
> #declare Pin_Raw=
> cylinder
> {
>  0, <0, 0.0037, 0>, 0.0001
> }
>
> #declare Pin_Transition=
> lathe { // RotSweep001
>   quadratic_spline
>   3  // control points
>   <28.704931, 14.913935>,
>   <5.999999, -0.033529>,
>   <0.639678, 11.939946>
>   scale 0.0001
>   translate 0.00003
> }
>
> #declare Pin_Socket=
> cylinder
> {
>  0, <0, 0.00003, 0>, 0.0006
> }
>
> #declare Pin=
> union
> {
>  object { Pin_Raw }
>  object { Pin_Transition }
>  object { Pin_Socket }
>  texture { T_Gold_2B }
> }
>
>   ------------------------------------------------------------------------
>  [Image]

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