Ignition, valve timing and automobile electric systems; (self-starting and lighting) a comprehensive manual of self-instruction on the operation, ... self-starting mechanisms. Complete tables an - Softcover

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...a jig for trembler screw points, the simplest possible form, if there is no difficulty in getting either a "tap" which will fit the trembler screw, or in cutting a tap to do so, all that is necessary for the trembler screw device is to drill and tap a hole through a piece of J-inch steel plate, ground perfectly true on one face, and then harden the plate. The hard, flat face acts as a guide for the file, insuring that it travels truly in the same plane, and the fact that the trembler screw is held by its own thread is a guarantee that the face of the point is at right angles to the line of the screw. This way of doing the point is the simplest, but supposing the trembler screw cannot have its thread matched without trouble and expense, the jig illustrated in Fig. I obviates any difficulty in this direction. It consists simply of a piece of cast steel bar, bent round as shown, and having the face marked D ground quite flat. Through the center of this portion of the bent steel a hole is drilled, which is exactly the size of the outside of the trembler screw, so that it will just push in from the under side easily. In the illustration a slice has been cut out in front of the trembler screw A so that it can be seen. Exactly opposite this hole in the other arm of the bend, a second hole is drilled and tapped with any convenient thread. Through this hole the round-ended set screw B is inserted, its rounded end bearing beneath the milled end of the trembler screw. The steel bend and the screw B should both be hardened. To use this jig the trembler screw is inserted, and the lower set screw B run up until the contact point C can just be seen, on glancing along the face D, to be sufficiently above that face to clean up quite flat. A fine flat file then ste...