Change Multiple Line Stroke in Illustrator and mantain the same distance between them


I have a serious problem. I want to change the weight of multiple lines but when I try do that the distance between them disapears and overlap. In straight lines that doesn´t happens, but in diagonal lines this happens always!!! Please can annyone help me please??!!!

Before change stroke

After change stroke

Thank You

8/7/2014 3:17:00 PM

Accepted Answer

When a set of lines go from horizontal to a diagonal, all your points are stacked along the same vertical:

lines demonstration

In order to maintain the same thickness and spacing for a diagonal line, your points must line up on an angle that is relational to the magnitude of the angle of the change in direction:

lines demonstration 2

8/7/2014 3:42:00 PM