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A Small Water Motor For Driving Dynamos

By W. E. Leach




A water motor, owing to the variety of uses it may be put to, will find ready call among experimenters. It is not at all difficult to construct and below I describe one that I made and used successfully to drive a dynamo, sharpen tools, as a drill, and also as a small lathe.

The first thing to obtain is the materials. These consist briefly of the following: 1 piece 2" x 8" x 10" plank (hard wood), 2 pieces 1" x 8" x 10" board (pine), some 1/4" X 1/2" board (soft or hard wood) 7 - 5" X 3/16" bolts, 4 1 1/2" X 3/16" bolts, 1 piece brass tubing 1/2" in diameter, 2 1/2" long (for nozzle).

To begin with, cut a case from the piece of plank as shown in Fig. 1 A and B. Bore seven 1/4" holes thru this as shown. At the bottom bore a 1 1/2" hole for an outlet. Then at the top. bore a 1/2" hole about 12 to the horizontal: this is the inlet. The rotating section is made up as shown in Fig. 2 A and B. The vanes or paddles are cut from 1/2" boards and of dimensions shown. They are hollowed out at the ends and are set into an axle cut from a piece of hard wood 1 1/4" x 2" with a 1/4" hole thru the center.

To make the nozzle take the piece of brass tubing above mentioned and solder to it a cone shaped piece of tin as in Fig. 3 - A. Now drive this into hole at top of case until its tip first comes to the inner edge.

Now for the sides, cut two pieces out of 1" pine as shown in Fig. 4. Bore 7 1/4" holes thru these to correspond to those in the case (Fig. 1). At the center bore a 1" hole, and about 1" away from the center in a perpendicular line, drill one 1/4" hole on each side of this as shown. Now make two plates 3" in diameter and 1/4" thick as shown in B (Fig. 4). Bore a 1/4" hole in the center and about 1" to either side bore another 1/4" hole. Make two plates of iron as in Fig. 3 - B. Drill holes to correspond to those in the plates, Fig. 4 - B.

Give all parts two coats of good water-resisting paint and when dry assemble as follows: Place a plate (Fig. 4-B) on the outside of the sides, put a wad of packing soaked in oil in the 1" hole. Then place an iron strip (Fig. 3-B) on the inside of each side and bolt firmly together with two 1 1/2" X 3/16" bolts. Drive a shaft thru the rotating part. Insert one end of shaft thru one side and then place inside of case. Put the 7, 5" x 3/16" bolts thru and fasten the other side together. (In setting up, if some pitch is placed between the sides and case it will prevent any leakage.) Connect the motor to any faucet by a rubber hose and it is ready for work.

If all parts were smooth and bored and cut accurately, little trouble will present itself and the motor will go buzzing around at first connection.



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