In order to resolve the issues of low efficiency and poor precision in the traditional finishing process of hardened internal gears. a method is proposed for calculating the profile curves of a drum-shaped grinding tool suitable for mass finishing of hardened internal gears. Additionally. the impact of drum-shaped grinding tool installation errors on the tooth surface deviation of int... https://www.bekindtopets.com/flash-find-Expansion-Board-2-0-for-Pycom-IoT-Development-Boards-Discontinued-clearance/