When
adjustment is satisfactory, mark the position of the foot on the bed,
solder foot to barrel, and drill and tap the foot for the holding-down
screws. Don't forget that the distance between pump and cylinder gland must
be at least 1-1/3 times the stroke.
The valve motion can then be taken in hand. Cut off for the guides, G1 G2,
two pieces of stout brass strip, 2-1/2 inches long and 3/4 inch wide. Lay
them together in a vice, and bore the holes (Fig. 113) 1-1/4 inches apart,
centre to centre, for the 1/8-inch rods, R1 R2. The feet are then turned
over and a third hole bored in G1, midway between those previously made, to
take the end of the support, PP, of the rocking lever.
[Illustration: FIG. 113.--End view of striking mechanism of steam pump.]
Screw G1 G2 down to the bedplate, 3/4 inch away from the cylinder centre
line. G1 is abreast of the mouth of the pump, G2 about half an inch forward
of the end of the cylinder.
The striker, S, is a piece of brass strip soldered to 1/2 inch of tubing
fitting the piston rod. (See Fig. 113.) Its length is decided by running a
rod through the upper holes in G1 G2, allowance being made for the notch in
the end.
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