Design Process-JH

For the lengths of the links, I created the input length to be 3.5", the sliding link to be 7", the coupler link to be 6", and the slider to be a 1.5" x 2" rectangle. The holes were .75" diameter and the pins were .725" diameter to allow for enough space to be inserted and account for errors in printing. I 3-D printed these pieces and assembled them, however the pins were too small in diameter to allow for solid contact. The CAD for the links is shown below:

I attempted to tape the pins concentrically to attempt for better contact, but then just reprinted them with .74" diameter which resulted in a better fit. Once assembled and tested, I realized the ideal setup as shown on the introduction page wouldn't allow my mechanism to function as well.  This resulted in me creating a modified assembly than the original diagram, however, the quick return was still achieved as well as the anticipated range of motion. The PMKS of the new setup is shown below: 

Even though this mechanism has the sliding link in Quadrant I instead of 3 and the coupler in Quad. 4 instead of 1, the anticipated range of motion for the slider was the same and still allows quick return to occur on the downstroke of the slider. The analysis of this layout is analyzed in the next page.