Insights for milling
From Fab Lab Bcn WIKI
http://hallmanufacturingsolutions.com/article.html?id=149807229
http://www.pdsspindles.com/engineering-speeds
http://hallmanufacturingsolutions.com/article.html?id=149807229
https://www.vortextool.com/images/chipLoadChart.pdf
http://www.cncroutershop.com/uk/calculate-feeds
http://academy.cba.mit.edu/content/tutorials/akf/Downloads/ShopBot%20Trainings/router_bit_basics.pdf
http://www.onsrud.com/xdoc/feedspeeds