This method will ensure the holes being in line, besides avoiding the
trouble of marking off the standards separately.
Bore a 1/4-inch hole in the centre of one cover--be sure that it is the
right one--for the piston rod.
You can now proceed to the making of the piston-rod gland (Fig. 54, G1).
Fig. 57 shows how this is built up of pieces of tubing and brass lugs for
the screws. If possible, get the tubular parts trued in a lathe.
[Illustration: FIG. 57.--Vertical section of cylinder.]
Before the gland is soldered to the cover, the cover should be put in
place, the piston rod attached to the piston, and the parts of the gland
assembled. Push the piston rod through the cover until the piston is hard
up against the back of the cover. Slip the gland over the rod, turn it so
that the screws are parallel to the foot of the standard, and make the
solder joint. This is the best way of getting the gland exactly concentric
with the cylinder so that the piston rod shall move without undue friction.
But you must be careful not to unsolder the cylinder from its standard or
the parts of the gland.
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