ASTRO-PHYSICS 900 German Equatorial Manuale - Pagina 8
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Now, if you proceed to mount up and balance your telescope, you can "feel" what this resistance in R.A. and Dec.
(movement backwards and forwards) is like when you make these motions from the eyepiece end of your telescope
as you would during normal use when slewing (pushing) by hand to acquire an astronomical object within the field
of view of your finder or scope
3. How tight can the clutch be and can you do any damage by pushing against them?
The maximum tightness of this clutch system is ½ turn (with a 5/32 allen key) further in than the tension you can
achieve with the knobs by hand. You will see that each clutch knob has a 5/32 hex socket for tightening with an
allen key. With this extra ½ turn on each clutch knob, the axis (axes) will be considered completely "locked up" and
you should not attempt to push your scope by hand against this "locked up" resistance, or undue stress will be
placed on the worm wheel/worm and bearings.
However, if you are undertaking a very long astrophoto exposure, it is advisable to increase the pressure on each
clutch knob (with the 5/32 key) by about 1/4
hand with this tension; however, you will notice considerably more effort is required to achieve movement. This is
the absolute maximum tension that can be used for hand slewing. As a general rule, if you have a big scope (7" or
8" refractor) with all the accessories, you will need more clutch tension than a 5" or 6" scope.
Drive Test Knobs - You will notice in the diagram below the R.A. and Dec. drive test handles. These are NOT
intended as manual control knobs for centering objects in the field of view. Please use the buttons of the dual axis hand
controller to center objects in the eyepiece. Never, never attempt to turn these knobs manually.
These test knobs are used at the factory for initial setting of the worm wheel/worm mesh. Their main purpose for the
end user is to give a quick visual verification of the worm drive motion (forward, reverse at 2x, 8x, and 16x). You can
easily see the rotation of these test knobs especially at 8x and 16x speeds.
th
turn on Dec. and 1/8
- 8 -
th
turn on R.A. You may safely slew the scope by