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a.
b.
Figure 4.
To connect the baseplates, tilt them only slightly, as
shown. Do not place them on their side.
(b)
the hex nut steady
while turning the other end of the azimuth
axis screw.
6. Place a fender washer (H) onto the azimuth axis screw (I).
Then push the screw up through the hole in the ground
baseplate (A).Then slide the encoder disk (J), flat side
down, onto the azimuth axis screw.
7. Place the brass bushing (F) onto the azimuth axis screw
(I) so that the wide end of the bushing is closest to the
encoder disk (J). Seat the bushing onto the encoder disk
so that the registration feature on the bushing goes into
the hole in the encoder disk. You may need to move the
encoder disk around on the azimuth axis screw a bit for
the bushing to seat properly.
8. Carefully position the top baseplate (D) over the ground
baseplate (A) and lower it so the brass bushing (F) goes
into in the center hole of the top baseplate. Place the
remaining fender washer (K) onto the shaft of the azimuth
axis screw, then thread the hex lock nut (L) onto the end of
the azimuth axis screw and tighten it finger tight, for now.
9. To tighten the azimuth axis screw (I) and hex lock nut
(L), tilt the assembled Dobsonian base at a slight angle
to lift the ground baseplate off the ground. Now, with one
wrench (or pliers) hold the head of the azimuth axis screw
still while turning the hex lock nut with the other wrench.
Figure 4 shows this being done. Tighten the hex lock nut
just until the top fender washer is no longer moving freely,
(a)
Use one wrench to hold
Correct Tension pads
Bearing
cylinders
Figure 5.
Attaching the bearing cylinders.
Encoder
connector
board
Screws
Figure 6.
Attaching the encoder connector board.
then tighten the hex nut a quarter turn beyond that. This
ensures proper spacing between the encoder disk and the
azimuth encoder board.
10. Attach the handle (M) to the front brace (B) with the two
handle mounting hex-head screws. Place one washer on
each screw, then press the handle against the front brace
(the end of the handle bearing the Orion logo should be
up). Then thread the screws from the inside of the base
into the handle until tight using the supplied crescent
wrench.
11. Line up one of the altitude bearing cylinders (N) with the
inside of one of the four bearing cylinder holes on the side
panels. Push a bearing cylinder screw through the side
panel and thread the bearing cylinder onto it (Figure 5).
The beveled end of the cylinder should be farthest from
the side panel. You can tighten the cylinder by hand or, if
needed, with the supplied 4mm hex key. Repeat for the
remaining three bearing cylinders.
12. Attach the encoder connector board to the side panel. Place
the board against the side panel so that the modular jack fits
into the square-shaped hole and thread four encoder board
mounting screws through the connector board and into the
predrilled holes in the side panel until tight (Figure 6).
7
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