There is nothing controlling the Dremmel ON/OFF or spindle speed.
Your steps motors are driven with a controller which reads if not standard G-Code a similar language to move the XYZ axis by increment in inches or millimeters.
You may have to remove the header and footer information of the generated G-Code program from Aspire to make it compatible for the controller.
Usually CAD/CAM Software comes with a perfect tuned up postprocessors fully compatible with the CNC.
This is what I got from Gravotech and their 3D Artistic software, TYPE EDIT: ?
Theodore