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140 manuals 2013_110 manuals 1/13/2013 10:40 PM Page 6
FOCUSER PARTS DESCRIPTION
Focuser locking collar (1) connected to the OTA flange (not shown) and holds focuser on the end of telescope.
Loosening it will allow you to rotate the focuser to any position.
NOTE: The focuser can be completely removed by unscrewing the locking collar completely and then pulling the
focuser from the OTA flange. This should only be done in rare special circumstances. Please contact TEC before
removing focuser for any reason.
Focuser draw tube (4) has laser engraved mm scale, inside it is painted with flat black paint and has number of
knife-edge baffles to reduce internal reflections at low angles.
Draw tube end cap (5) with Collet locking nut ((7) and Collet sleeve (8) are assembled as one unit. This unit can
be removed by loosening three 6-32 set screws (6) and unscrewing it completely. The Field Flattener for wide field
imaging could then be screwed onto the focuser draw tube end.
The Collet sleeve is made of Aluminum, its surface is tumbled and left un-anodized to avoid scratching the barrel
of eyepiece or other equipment, also coefficient of friction of unanodized aluminum is higher than for anodized
aluminum.
NOTE:
keep the Collet locking nut tightened at all times to avoid droping /damaging your equipment!
Coarse focusing knobs (9), here and further CFK and Fine focusing knob (10), FFK have special shape slots cuts
around of cylindrical surface for better tactile feeling during focusing.
Left focusing knob can be removed by loosening set screw (11), a Robofocus or other brand of electrical motors
can be installed instead, use 4-40 threaded holes (13) for motor bracket installation.
Please note: the pinion shaft diameter is 1/4".
The movement and feel of the CFK (9) and FFK (10) is preset by TEC before shipping; however, the "Feel" may
be adjusted to your liking. By increasing the friction between the CFKand FFK the load carrying and holding
ca pacity will also be increased.
To increase the friction felt and increase the load carrying capacity, first, using your left hand, grip the FFK, then
with your right hand, loosen the Fine Focus Lock Knob, FFLK (10.1) by turning it counterclockwise. Next, while
holding the CFK, turn the FFK by approximately 10 degrees clockwise (about 1/2 the angle between two slotted
cuts on the course focus knob). Finish by resetting the FFLK by gripping the FFK and turn in the FFLK clockwise
and tighten it.
Please note, the steps to loosen up the "feel" is the same as above with the exception of turning the FFK 5-10
degrees counterclockwise. Please note, while giving a looser feel, this will reduce the load capacity and
holding capacity of the focuser, particularly pointing at the zenith. Moreover, the holding capacity of the focuser
can be increased up to full lock-up if needed.
Pinion shaft housing (12) attached to the focuser housing (3) with 4-40 socket head cup screws (14).
Position of the pinion housing with pinion shaft relatively to the rack (installed on the focuser draw tube), is
precisely adjusted by TEC during assembly.
The Focuser housing (3) also has two 8-32 threaded holes for finder base installation (these holes are on the left
from TEC logo) not shown on given sketch. If finder base is to be installed on the focuser housing, make sure the
screws being used are of correct length to avoid scratching/damaging internal parts of the focuser housing.
Please contact TEC if you have question about the length of the finder base screws.
Do not ever try to disassemble the focuser for any reason, it can not be done without proper tools and
without knowing its internal structure. Attempt to disassemble focuser may end with focuser parts damage
and loosing warrantee. Contact TEC if you have any issues or question about the focuser.
Please avoid unscrewing these screws.
WARNING:
6
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