How to make something rotate at an angle using parenting, constraints or drivers?

Thanks Eppo.

How do you apply a scale or rotation??

First, try to not scale while in object mode if you are in modeling stage. Do this in edit mode.
Ctrl-A in object mode calls up menu to apply scale, rotations for objects. Alt-r or Alt-s sets back these.
http://wiki.blender.org/index.php/Doc:2.6/Manual/3D_interaction/Transform_Control/Reset_Object_Transformations

Champion Eppo!

I tried it on the ’ Wheel Problem ’ blend and it seems to have worked!

I did n’t realize there was a Apply Scale and Rotations menu.

Many Thanks.