21. The worm gear ensures that the capstan cannot turn without a movement on the knob; it also allows precise tuning. 22. The headstock ( 1 ) contains the metal machine heads ( 1.1 ), which use a worm gear for tuning. 23. He was an early electric motor designer and, paid particular attention to bogie cars and worm gear in this connection. 24. The rotor is not allowed to turn freely and it can be mechanically shifted by means of a worm gear . 25. It entered a worm gear at the pivot clamp, then continued to the nose clamp where it entered another worm gear . 26. Occasionally a worm gear is designed to run in reverse, resulting in the output shaft turning much faster than the input. 27. The key on the tuning machine turns a metal " worm ", which drives a worm gear that winds a string. 28. It entered a worm gear at the pivot clamp, then continued to the nose clamp where it entered another worm gear. 29. This arrangement enabled them to be raised by rotation, though still exposed, or lowered in fifteen seconds through a worm gear drive. 30. Fortunately, one advantage the drive on the BL2 locomotives model, was the fact that the trucks and worm gears covers were exposed.
