The scanned pages below include the scratch work and analysis done on a power screw. In this specific case, I and my colleague Aaron Auth designed a C-clamp. Aaron dealt with the CAD odeling and tracking down the correct screws for the job while I tackled the analysis of the forces inside the clamp. the download link below contains a zip folder of the part files, all done in solidworks. The screw and collar part files were downloaded directly from the source website.