Reassemble the parts, and put in the rest of the holding
screws, which should have their heads countersunk flush with the wood.
[Illustration: FIG. 106.--Water turbine, with pulley side of casing
removed.]
For the shaft select a piece of steel rod 5/32 inch in diameter, and 3 or
4 inches long; for the bearings use two pieces, 3/4 inch long each, of
close-fitting brass tube. Now take a drill, very slightly smaller in
diameter than the bearings, and run holes right through the centres of, and
square to, the sides. Both holes should be drilled at one operation, so
that they may be in line.
With a wooden mallet drive the bearings, which should be tapered slightly
at the entering end, through the sides. Push the shaft through them. If it
refuses to pass, or, if passed, turns very unwillingly, the bearings must
be out of line; in which case the following operation will put things
right. Remove the bearing on the pulley side, and enlarge the hole
slightly. Then bore a hole in the centre of a metal disc, 1 inch in
diameter, to fit the bearing; and drill three holes for screws to hold the
disc against the case.
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