The face of
the crank should be about 3/8 inch away from the piston rod centre line.
Bring the nearer bearing up against the back of the disc, and arrange the
standards equidistantly from the ends of the bearing. The other bearing
should overlap the edge of the bed by about 1/8 inch. Get all standards
square to the edge of the bed, and mark off the positions of screw holes in
bed. Remove the standards, drill and tap the bed-plate holes, and replace
parts as before, taking care that the lubricating holes in the bearings
point vertically upwards. Then solder bearings to standards.
If any difficulty is experienced in getting all four standards to bed
properly, make the bearing holes in the two inner ones a rather easy fit.
The presence of the crank-shaft will assure the bearings being in line when
the soldering is completed.
The standards and bed should have matching marks made on them.
The Eccentric.--This can be formed by soldering two thin brass discs
1-15/16-inch diameter concentrically to the sides of a disc of
1-15/16-inch diameter and 5/16 inch thick. The centre of the shaft hole
must be exactly 9/32 inch from the centre of the eccentric to give the
proper valve-travel.
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