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140 manuals 2013_110 manuals 1/13/2013 10:40 PM Page 5
TEC LARGE FOCUSER
The TEC focuser for APO140 and larger telescopes has been
designed and made in our shop. While similar in appearance to
other focusers on the market, it has a few special features that
were required for today's imaging:
• It is all metal 2" collet type holder; being all metal it does
not change holding force under colder temperatures and
would not be damaged from sun heat exposure either.
• Holding capacity (axial load) of TEC collet itself
is over 3 times the telescope weight - thanks
to special design of the collet. Compared to
traditional thumb screw holders the collet
type holder keeps item's axis strictly
concentric to focuser axis by definition.
• Focuser draw tube is held in the focuser
housing all the way around that also makes
the axis of draw tube strictly concentric to
the optical axis of the telescope. Holding draw
tube in such a way makes focuser more robust,
it has virtually no play under radial load, 7lb
weight shifts fully extended draw tube for less than 20mk.
• The planetary mechanism ratio is 1:10 and one turn of
the fine focusing knob moves focuser tube 1.8mm.
• The TEC focuser is "dry" - no oiling is required on the draw
tube - this will keep focuser draw tube free from dirt.
FOCUSER PARTS
1.
Focuser locking collar with 3 pegs
2.
TEC logo
3.
Focuser housing
4.
Focuser draw tube
5.
Draw tube end cap
6.
End cap locking screws (3X)
7.
Collet locking nut
8.
Collet sleeve
9.
Coarse focus knobs (CFK)
10.
Fine focus knob (FFK)
10.1
Fine Focus Lock knob (FFLK)
11.
Left knob set screw
12.
Pinion shaft housing
13.
Pinion shaft housing threaded holes (4X)
14.
Pinion housing screws (3X).
9
14
13
11
5
1
2
3
9
10
10 1
4
5
6
7
8
9
12
13
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