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Orion SkyQuest XT Instruction Manual page 5

Classic dobsonians

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Figure 5. Once the bolt is inserted through the groundplate
and top baseplate, place the second washer on the bolt and
then thread on the lock nut. Use the two 17mm crescent
wrenches to lightly tighten the nut.
so the flange of the threaded insert is facing inward (see
Figure 2 inset). And the front panel should be oriented so
the felt pad at bottom is facing inward. Do not completely
tighten the screws yet.
2.
Now turn the side panel assembly upside-down
and stand it up as shown in Figure 3. Attach the top
baseplate (C) to the assembly with the remaining six
base assembly screws in the predrilled holes. Tighten all
six screws.
3.
Tighten the six side panel screws installed earlier.
4.
Place the T-nut (Z) into the center hole of the bottom
(triangular) baseplate (D). Insert it from the top side,
which is the side with the three white azimuth bearing
pads. (Figure 4A).
Lay the base assembly on the floor as shown in Figure
5.
4B. Next, insert the plastic bushing (Y) into the hole in
the center of the top baseplate.
6.
Thread the hex-head bolt (F) with a washer attached up
through the bottom baseplate from below (the side with
the feet), threading it into the T-nut all the way until tight.
(Note that 4B shows the bolt before it has been threaded
in all the way.) Then align the bolt with the center hole
in the top baseplate and insert the bolt through the hole.
Thread the remaining washer and lock nut onto the end
of the bolt. You won't be able to turn the lock nut very far
with your fingers – you just want to get it started.
7.
Next, use the two provided 17mm crescent wrenches (T)
to lightly tighten the two baseplates together. Use one
A
B
Figure 6. Attach the handle to the front brace of the base
(A) with the two socket head cap screws, washers, and hex
nuts as shown in (B). Use the 14mm crescent wrench and
6mm hex key to tighten the nuts.
crescent wrench on the bolt's head (under the bottom
baseplate) and one wrench on the lock nut, as shown in
Figure 5. Tighten the lock nut with the wrench just until
the white plastic pads on the bottom baseplate contact
the top baseplate. The bottom baseplate should be able
to freely rotate; if the lock nut is too tight the rotation
becomes stiff or difficult. You may have to stand the base
upright on its feet and try rotating it to gauge whether it
rotates smoothly, without too much friction. If needed you
Washer
5

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