출처 : http://mikesworkshop.weebly.com/making-gear-cutters.html http://mikesworkshop.weebly.com/improved-gear-cutters.html http://mikesworkshop.weebly.com/update-on-gear-cutters.html 위의 공식들을 적용해서 만든 엑셀 표 involutegearcutter_buttonmethod.xlsx