Helix angle the helix angle. The efficiency can be plotted versus the helix angle for a constant friction, as shown in the adjacent diagram. The maximum efficiency is a helix angle between 40 and 45 degrees, however a reasonable efficiency is achieved above 15°. Due to difficulties in forming the thread, helix angle greater than 30° are rarely used. Moreover, above 30° the friction angle becomes smaller than the helix angle and the nut is no longer self-locking and the mechanical advantage disappears. In helical and worm gears, the helix angle denotes the standard pitch circle unless otherwise specified. Application of the
36 Degrees a performance "The average body temperature is 37 degrees. This is a song called 36 Degrees", further adding to the speculation. However, the term "36 degrees" also means two people who are not getting on in urban slang; therefore the idea of the song being written for a break-up could well be true. The other numbers mentioned have been said to just be random, as "they just seemed to fit" according to Molko. The music video, directed by Chris Cunningham, was shot primarily in a scuba diving pool and shows band members performing the song underwater. Some scenes were shot