I hope my question will be clear, what I want to do is duplicate the red line around the two paths. Now I use the green path to duplicate with the curve duplicate tool. But I want the red line to be evenly spaced between the blue and green path. Is this possible?
I first put a point in the 3 O'clock position of the circle and ellipse and then used the Array curve tool to duplicate them around each shape, one at a time. That made it easy to snap a line between each pair of points.
Thanks both for the suggestions but it's not exactly what I need. It's a litte difficult to explain 'cause English isn't my native language and I used a bad example I guess :). But here a new one. It's possible I have to deal with those shapes. So I those lines to be evenly distribute between the paths. So there's no overlapping and an even spacing. In the first one I used the outside path as 'rail' in the second one the 'inside'.