I have just downloaded an educational version of Inventor. Although I can create sketches I cannot extrude the sketch to form a solid. The origin arrow heads appear over size and it seems as if the origin plane is being extruded to form a solid! Any ideas??
Yes, you are trying to use professional 3D parametric software without any training.
Try this first: http://home.pct.edu/~jmather/AU2007/MA105-1L%20Mat
Here is another idea, attach your ipt file here so that others can check the behavior you report with your file.
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