Page:Popular Science Monthly Volume 90.djvu/307

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A Craftsman's Combination Foot-Lathe

��An inexpensive combination scroll-saw and wood-lathe By C. H. Patterson

��SIMPLICITY and economy have been kept in view in designing this combina- tion lathe. It will swing 6 in. above the bed and 4 Yi in. above the tool-rest sup- port, and it is about 18 in. between centers. The swing can be made greater by increas- ing the height of the head and tail stock- standards, and the length of the bed can be increased to 4 ft., if a third bend is made in the crank as shown in the cen- ter line drawing. In this case, it will be necessary to use a crank of larger di- ameter, say, i^ in. The bed of the lathe is made of two hard- wood timbers 36 in. long, 4 in. wide and 2 in. thick, sepa- rated, as shown in the end elevation, by I by 3-in. pieces, to which they are bolted. The left piece forms a part of the outer stand- ard, as shown in the detail drawing of that standard. The legs are of stock 3 in. wide and 2 in. thick. A triangular piece is sawed from an upper corner of each leg. These pieces are nailed to the outer surface of the legs, care being taken to place them so that they will not be in the way of the holes bored for the bolts. These holes are then bored and the legs bolted to the i by 3-in pieces mentioned. It will be seen that the triangular blocks provide parallel surfaces for the heads and nuts of the bolts that pass through the legs.

The crank is of i-in. iron, bent as indicated in the center drawing. This will be a job for the blacksmith and machinist, but the cost of the completed crank should be small. For a distance of i in. inward from the ends of the crank, it is turned to

��The lathe as it is used tachments may be appUed

��a diameter of ^ in., to provide bearing surfaces. Pieces of J^ by 3-in. stock are screwed across the outer sides of the legs. To the inner surface of these pieces are nailed other pieces of i-in. stock, in which holes should be bored to receive the bearing-ends of the crank.

A strip of I by 4-in. material is nailed across the back of the legs and to it are screwed the hinges upon which the pedals swing. The pitmen may be cut from a I-in. board. Holes are bored in them to receive the cranks. A central slot is made with a saw-cut in the ends of the pitmen for about half their length, and the parts are pried open and slipped on the cranks. Some pieces, i by 3 by 4 in. are nailed to the lower side of the pedals and nails are passed through them and through the pitmen. Half round strips are nailed across the pedals near their free ends for the feet to rest upon.

The drive wheel is built up of three series of segments cut from i-in. board, preferably of hardwood. The single spoke in this wheel is also built up of three pieces. The central piece of the three must extend well into the wheel-segments. These segments can be sawed with a band-saw. The hole in the spoke that receives the crank-shaft should be bored true in a boring machine. A smaller hole is bored through the spoke to receive a pin, for pinning the wheel to the shaft. After the wheel is mounted, a board may be clamped across the legs, close to the wheel, for a

���for turning wood. At- for other kinds of work

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