CorelDRAW Graphics Suite X5 :: Unable To Precisely Graduate Circle

I'm trying to graduate a circle precisely . An example such as a draftsman's compass or a clock face. I create a circle then I make a vertical line which then I copy , space them apart and create a blend between them. I then choose (new path) and select  the circle, then (blend along full path) and finally (rotate all objects).

At a quick glance it looks proper but as in the case of a clock face (a graduation every 30 degrees)  some of the lines are not precisely radiating from the center of the circle I'm using as the path. In the near future I plan on drawing" to scale' a certain number of meshing gears and this will cause problems.