tangent spline to a series of circumferences

[Counterblow Hammer]

Hello everyone!

I would kindly need advice: how can I with autocad 2010 draw a spline that interposes a series of circumferences (and that consequently is tangent to these)?

In practice: given the circumferences in the annex I want to trace a spline that is tangent in every given circumference (clearly or at the top or below than these).

Thank you very much and good day. . .


p.s.: For those who have a solution with rhino for me it is fine the same.. .

 

[GP.]

splines
tan (select 1st circle)
tan (select 2nd circle)
tan (select 3rd circle)
tan (select 4th circle)
sending


or set osnap = tan and select the circles in sequence.

 

[Counterblow Hammer]

splines
tan (select 1st circle)
tan (select 2nd circle)
tan (select 3rd circle)
tan (select 4th circle)
sending


or set osnap = tan and select the circles in sequence.

Thank you so much!