Motor Bicycle Building

📙 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. 1906 Excerpt: ...and test this by measurement; if it requires bending or twisting, this may be done cold. Union Nut for Induction Pipe.--The union nut for connecting the inlet or induction tube from the carburetter to the cylinder is shown in plan and section at Figs. 62 and 63. It may be a phosphor-bronze, gunmetal, or brass casting, machined all over to the following dimensions: Bore, lTin.; diameter at the screwed part, If in. by twenty threads, to fit easily the screwed opening in the valve chamber of the cylinder; length of screwed part, i in.; diameter of collar, 2T'ff in.; depth, J in. Means for tightening and slackening this out must be provided, either by filing four slots in the edge of the collar, as shown, by drilling tommy holes, or by filing the collar hexagon. By adopting the first method, the nut can always be undone on the road by using a large nail or anything else handy as a punch, and a spanner or stone as a hammer, in the absence of a suitable large spanner to fit. Flywheels.--The two flywheels may now be taken in hand. Fig. 64 is a plan of one of them, and Fig. 65 a section. They are 7-Jf in. in outside diameter and lj in. wide on the rim, and weigh about 24 lb. the pair. If the casting is chucked on the jaws of a three-or four-jaw chuck, letting the jaws grip outward into the deep recess under the rim, nearly the whole of one side and edge of the rim may be machined at one operation. Turn up the rim 7,-7n-in. in diameter, and true up the face of the rim and the inner edge. Face off the centre recess If in. in diameter by f in. deep from the rim face; bore a-in. hole in the centre for the main shaft, then set the sliderest to 3 degrees of taper and turn out the taper for the shaft end; this should bring the large end of the hole to J-in. To make a real...