Practical Treatise on Milling and Milling Machines/Chapter ...
Sep 06, 2015· Spiral Head—Indexing and Cutting Spirals. The mechanism known as the spiral head constituted one of the fundamental parts of the original universal milling machine. Its primary purpose was that of indexing and rotating work in Spiral Head conjunction with the movement of the table for cutting flutes in twist drills. The great possibilities it ...