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Layer D D-13 +(D-13)*Pi/13 Wires No. 1 750 737 178.10414 178 2 724 711 171.8209546 171 3 698 685 165.5377692 165 4 672 659 159.2545838 159 5 646 633 152.9713984 152 6 620 607 146.688213 146 7 594 581 140.4050276 140 8 568 555 134.1218422 134 9 542 529 127.8386568 127 10 516 503 121.5554714 121...

Sorry ! The last correct sentece is: Zn = integer {[(Xn - Y/2) x 3.1416]/Y} where Xn= X(n-1) - n times Y.

You may try to solve the problem in parts. Named X as the internal diameter of the pipe. Named Y as the external diameter of the wire. To form the first layer of threads leaned in the internal walls of the tube, you will need Z1 numbers of threads. Z1= integer {[(X - Y/2) x 3.1416]/Y} = 179 You...

As silicon is abundant, the basic material cost is low. Working the material is more expensive than working metal. Instead of melting and casting a process of pressurising powder, sintering and curing is used, which takes time. After that, boring and finishing is easier and faster for the...