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Page:Popular Science Monthly Volume 89.djvu/942

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��Popular Science Monthly

��tails of this block will be taken up in the order of construction for setting the motor- cycle.

Rear Riiiniers The rear runners are built independently of each other and should l)e made of i^-in. hardwood 44 in. long and 9 in. wide. Make the top plalc II of i-in. hardwood 36 in. long and 6 in. wide. These top-plates should be secured to the runners in such position that the outside edge extends about 2 in. beyond the outer face of the runner. Care must be taken that this plate is di- rectly at right angles to the runner. Put a triangular brace directly under the supporting tube as shown in the dotted lines in Fig. 3. As these runners must ha\-e a free movement to pass over obstructions they are not attached directly to the frame but to the axle-tube I, Fig. i. The axle is

��In the center, for a distance of about 7 in. use the full width of the piece, then cut on an angle to 3 in. in width as shown in Fig. 4. At a distance 20 in. from the front end of each of the runners cut a notch 2|^ in. wide and 2 in. deep to receive the ends of the crossbar J, Fig. i. The top-plate of the front runners is 2 in. wide and i in. thick. As a part of the crossbar ends pro- jects I in. above the top of the runner this must be removed so that the plate will set on the runner-top and come level with the crossbar surface. To further stiffen the runners laterally, triangular braces similar to tiiose in the rear runners are set as shown in F"ig. 4. Diagonal braces A', Fig. i, must be added to stiffen the runners for steering. The frame and the front runners are pivotally connected by means of a king- bolt which should be about 12 in. long and

���Elevation of the motor-bob, showing the location and parts of the motorcycle used, steering arrangement and main frame with dotted line designating the outline for a body and motor-cover

��a piece of i-in. gas-pipe, or, if preferred, a piece of 8-gage steel tubing 134 in., outside diameter. Make six stirrups out of i-in. by 3^s"in. strap-iron. Two of these are used for securing the tube to the frame sides, the other four for securing the run- ners as indicated in I'ig. 3.

The stirrup-clips for securing the runners to the axle-tul)e must be loose enough to allow the runners to turn on the tube. Thread the ends of the pipe and screw ordinarN' pipe-caps thereon to iiold the run- ners in place. 'I"he outline of the runners should be long and flat, about as indicated. These may be either solid or cut out as suggested in the illustration.

The Front Runners

Build up the frrint runners as one unit with each runner 36 in. long, (j in. wiile anil l>^ in. thick. Make the flat part of these runners about 24 in. long to facilitate turning the front part in steering. The center crossiiar J shouUl be of hardwood 42 in. long, 4 in. wide and 23 < in. thick.

��^ in. in diameter. It is located lyi in. from the front of the frame and directly in the center, where a \ertical hole is bored through the pieces G, E and F. In the center of the crossbar J of the front run- ners drill a hole large enough to receive the kingbolt and taper it outwardly toward the bottom so that there may be some pla>- for the bolt.

Cut from a jiicce of boiler plate, or an\' 1.4-in. steel, a jilate 6 in. loHg and 2)2 in. wide. In the center of this make a hole to receive the kingbolt. Near each corner of the plate, drill and countersink holes for 3/4-in. wood screws. These are used to secure the plate to the crossbar J. Between the iilate and the frame member /■" place a l.irge washer to further facilitate the turn- ini;. Put on a similar washer at the lower I'ud of the kingbolt and linish with either a large nut or cotter.

Mounting the Motorcycle

Having proceeded thus far the chassis is readv for the motorc\Tle. Remove the

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