Abstract
Internal threads have been generally produced by using cutting machines, such as tapping mach'nes or lathes. A rolling method of threads has been generally used to manufacture external threads.
In this study we tried to roll the internal threads having fine pitch. The authors have made an equipment to roll internal threads using a lathe ; that is, a rolling die is supported on the main spindle of the lathe, and then the tool rest fitted with the thread blank is pushed toward the die by a spring to press the thread blank into the die. The two types of internal threads have been used in the above-mentioned experiment ; one has 1mm pitch and the other 0.5 mm pitch.
