Design of Toroid-Shaped Solid Ceramic End Mill Vladimir Grechishnikov, Sergey Grigoriev, Petr Pivkin, Marina Volosova, Alexander Isaev, Dmitry Nikitin and Ilya Minin EPJ Web Conf., 224 (2019) 05001 Published online: 09 December 2019 DOI: 10.1051/epjconf/201922405001