https://forum.missouriquiltco.com/forum/we-don-t-know-much-but-we-know-quilters/quilting-questions/55252-understanding-seam-allowance-from-a-mechanical-engineering-perspective-new-guy/page3
Jul 9, 2015 · It reminds me of when I went to the local hobby shop looking for components for class projects such as solar powered cars. "I need a 61 tooth gear with 21 pitch," an