Through this tutorial you will learn to scale an object without scaling its stroke in Adobe Illustrator CS3.
Create a new document. Select the Rectangle Tool and draw two circles.
Using this example I am going to tell what you are not supposed to do.
Open the Transform palette. Click on the options in the upper right part.
Make sure the “Scale Strokes and Effects” is selected.
Now scale the objects. You can see that the size of the rectangle along with the stroke is getting bigger.
If you don’t want to scale the stroke just uncheck “Scale Strokes and Effects” in the Transform palette.
Now scale the rectangle and you can see that the stroke remains the same size.