The Kokusai Kohki T-REX alt-azimuth mount assembly manual

The Kokusai Kohki T-REX alt-azimuth mount assembly manual
The Kokusai Kohki
T-REX alt-azimuth mount assembly manual
This manual explains assembly procedures for the standard model T-REX mount. Optional
versions of the T-REX are also very similar so we include this manual for all T-REX
owners, including the Vixen tripod mounted T-REX, and special order T-REX mounts.
Please read and understand this manual to insure safe and enjoyable operation of your TREX. Images used in this manual were taken from the first production run of the T-REX, so
small differences may appear between these images and your T-REX. Also, the T-REX
design and configuration is subject to change without notice, based on improvements
implemented by our design team, and the ever changing requests and requirements of our
(1) Assembling the tripod
Remove the GMT-128 tripod from its box, place it
carefully on a flat surface and, being careful not to
pinch fingers etc when doing so, spread its legs so
that the tripod does not fall over. Find the center bolt
on the underside of the tripod which will mate to the
T-REX, and remove the knob-nut on its bottom. Find
the tripod spreader/eyepiece holder plate and slide
it, flat side up, on to the center bolt. Reapply the
knob-nut and lightly tighten it. Locking the tripod legs
will be performed in Step 3
(2) Attaching T-REX to the tripod
Place the T-REX onto the top of the tripod so that
the hollow on one side mates with the nut head
projecting from the top of the tripod head. Line up
the attachment hole on the bottom of the T-REX
base to the tripod center bolt.
WARNING: during attachment to the tripod, always
keep one hand on the T-REX to stabilize it and keep
it from falling. DO NOT release your firm grip on the
T-REX until the tripod attachment center bolt has
been securely threaded all the way into the
attachment hole on the base of the T-REX.
(3) Locking T-REX to the tripod
Grip the center bolt and screw it into the T-REX
base, firmly locking it onto the tripod. Again, DO
NOT release your grip on your T-REX until the
center bolt has been securely threaded all the way
into the attachment hole on the base of the T-REX.
Continuing from Step 1, rotate the 3 prongs of the
tripod spreader/eyepiece holder plate so that they
squarely contact the inside of the tripod legs. Tighten
the knob-nut to cinch the spreader against the legs,
locking the plate and the tripod legs into this position.
(4) DSC tray TREX-SH bolt attachment
The following is for owners using a DSC readout module with their T-REX
Install the rod used in attaching the TREX-SH tray to
the T-REX by inserting the included M8 bolt into one
or the other of the two holes in the T-REX L-plate,
and screw it into the attachment rod. The rod should
protrude to the side away from the telescope. You
can attach to either hole; whichever position feels
more comfortable is fine. Use the provided hex
wrench to lock the attachment rod to the T-REX Lplate.
(5) Attaching the DSC holder tray
Slide the female sleeve of the TREX-SH holder tray
over the attachment rod, adjust the angle and lock
this angle with the set screw on the tray. Feel free to
adjust this angle for the best view of your DSC
readout module`s display.
To prevent your DSC readout from falling, you can
also use the included Velcro tape to stick it to the
(6) Installing the slow motion handles,
and saddle plate lock bolts
Slide the slow motion handles onto the shafts of both
axis. Using the included hex wrench, face the set
screw on each handle to the flat part of the shaft and
lock into position.
When attaching the saddle plate, use the two
attachment bolts to lock it to either set of the four
attachment holes on the altitude axis. This lets you
attach your saddle plate in either of two angles, in
accord with your own preference in telescope
placement and observing style.
(7) Completing the assembly of your T-REX
Attaching the clamp handles to both axis and inserting
the modular connectors of the encoder cable into the
encoder jacks completes the assembly procedure.
Note: bolts inserted into the clamp holes at the factory
act as a plugs to insure that no dirt or grit etc., falls into
these holes during shipment. After removing these bolt
plugs, immediately replace them with the clamp
(8) The included hex wrenches.
Hex wrenches are provided with your T-REX. Pictured
from left to right, the M8 wrench is for cap screws, and
the M10, M5 and M3 wrenches are used for set
screws. The M8 and M5 hex wrenches will probably
get the most use.
The M5 wrench picured at left is used for attachment
and removal of the bolt plugs covering the holes that
the clamp handles screw into.
The M8 wrench is used in TREX-SH rod attachment,
as well as for most of the other bolts used on the TREX.
The M10 hex wrench is used to remove a single set
screw on the side of the azimuth axis, which is merely
a cover for a tiny M3 setscrew underneath that locks
the azimuth encoder into position. In the unlikely event
of an encoder malfunction, you can remove this M10
setscrew bolt to gain access this encoder (pictured is
the M3 hex wrench) .
Using the Vixen SX-HAL-130 aluminum tripod
When installing your T-REX in a Vixen SX-HAL-130 tripod, align the indent on side of the T-REX mount to the
projection at top of the tripod. While holding the T-REX in this position, thread the attachment bolt on the underside
of the tripod to the T-REX attachment hole and firmly tighten. WARNING: during attachment to the tripod, always
keep one hand on the T-REX to stabilize it and keep it from falling. DO NOT release your firm grip on the T-REX
until the tripod attachment bolt has been securely threaded all the way into the attachment hole on the base of the
The clamp handle
T-REX clamps also include a clutch mechanism. At times, the angle of the clamp handle, when the clutch is
engaged, can interfere with the access to the slow motion handles, etc. In this event, place your thumb in the
center of the clamp handle and gently lift up the handle with your index finger. This releases the clamp handle lock
from the shaft, allowing you to freely rotate it to your desired position. By releasing the handle, it will lock it into its
new position automatically.
Slow motion handles and gear unit adjustment
The slow motion controls of your T-REX are factory adjusted for best performance before shipment, but in the
unlikely event that an adjustment becomes necessary, or the owner desires to make one, the slow motion control`s
gear box is designed to be user friendly with regard to this function.
The slow motion control`s shaft is connected directly to the worm wheel shaft of the gear box, and the rectangular
gear box cover itself is the mechanism that controls the mesh of this gear against the worm gear inside. The four
cap screws in the corners of the cover plate act to pull the worm gear away from the wheel, and the four set
screws forming the inside perimeter act to push the worm gear against the worm wheel. The adjustment of these 8
screws allow you to precisely contour the mesh of this gear (as well as amount of gear backlash) to your own
preference. Warning: do not overtighten these adjustment screws, or damage can result.
To control gear tension, adjust the tightness of the brass plug screw opposite the gear shaft (again, do not
overtighten). Completely unscrewing the four cap screws securing the gear cover will allow you to remove the slow
motion handle and worm gear assembly from the T-REX shaft, exposing two set screws that control primary gear
tension. However, over or under tightening of these two set screws can easily result in damage to the gears, so be
sure to make any adjustments here with awareness of the delicate nature of this adjustment. Damage resulting
from, and/or repair fees incurred from gears improperly adjusted by the user are not covered by warranty.
This completes the assembly and use instructions for your T-REX, a mount designed to work easily and enjoyably
with a wide variety of telescopes. Feel free to contact us with any questions or concerns not covered in the above.
We look forward to your comments and hope you enjoy your T-TEX alt-azimuth mount! Clear skies to you!
Kokusai Kohki (KK Magellan)
Ouno Cho 7-7, Kamikatsura, Nishikyo Ku, Kyoto, 615-8215 JAPAN email:
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