GrabCAD is a very good resource to share CAD models and is a bliss for engineers like us. Most of the CAD files we deal at AR-CAD are the assembly files which have some motion in them. Of late, we have been using a lot of their models in our work. In this tutorial we do the following:
- Import IC Engine (Slider Crank) CAD file (STEP format) inside SpaceClaim, which is a CAD neutral software.
- Rearrange SpaceClaim assembly slightly to make it more logical assembly.
- Define Assembly Conditions/Constraints between different Components (parts)
- Rotate the crank in SpaceClaim using Move command and see the movement of the mechanism. The piston goes up and down.
- Start SC-Motion and define rotation at the crank
- Perform Motion Simulation and see the animation.
We are grateful to Hardi Meybaum and Indrek Narusk who co-founded GrabCAD as an awesome platform for CAD Engineers/Designers 
Great presentation! Thanks for sharing. Look forward to seeing more of your videos about SpaceClaim. Also I was unaware GrabCAD existed, what an invaluable tool!
Ben,
We are glad you liked the tutorials. We are planning to post more of these. GrabCAD is like Facebook for CAD users. It is a boon for users like us.