URL https://www.researchgate.net/profile/Balazs-Miko/publication/280302282/figure/fig4/AS:667622060351493@1536184911285/Effective-diameter-of-the-ball-end-milling-cutter-in-concave-radius.jpg
URL2 https://www.researchgate.net/figure/Effective-diameter-of-the-ball-end-milling-cutter-in-concave-radius_fig4_280302282
