Your Sketch1 is not constrained and dimensioned. If you edit the sketch and look in the lower right corner, you will see "48 dimensions needed". A properly constrained sketch will report "Fully Constrained". So, you will need to get some training (see Help for tutorials, search here for JDMather's basic skills documents).
Modeling tips: as JDMather often writes to new Inventor users "You're doing way too much work. Get lazy." I would use the Contour Flange tool to avoid so much sketching and constraining, and I would model half of this, then mirror. See the attached for one way to accomplish this.
Sam B
Inventor 2012 Certified Professional
Please click "Accept as Solution" if this response answers your question.
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Inventor Professional 2013 SP1.1 Update 1
Windows XP Pro 32-bit, SP3
HP EliteBook 8730w; 4 GB RAM; Core™ 2 Duo T9400 2.53 GHz; Quadro FX2700M
SpaceExplorer/SpaceNavigator NB, driver 3.7.18
still waiting for a foreshortened radius dimensioning tool in Drawing Manager
