It's not very good English. I wonder if it is actually translated from another language already Maybe even Chinese? 'Grinded' should be 'Ground'. 'glued' is a very strange word in the context. The grammar is also a bit strange. My Chinese isn't good enough to translate, but perhaps I can help. (In several steps) = Using 2-4 different processes. the thread = 螺纹 (was developed) = was made (glued thread end sleeve) - this part I'm not sure about, and is strange English. Glued where? Machined = turned on a lathe probably. grinded - should be ground. Ground with a mechanical grindstone. (thread end-profile) this part I'm not sure about, and is also strange English fully profiled bar with thread end = A bar, which has been fully profiled (shaped) with a thread at the end.

Thank you for your help. I guess it maybe written by Japanese...