ASTRO-PHYSICS 1200 Manuel - Page 6

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1. Remove the R.A. encoder housing and encoder adapter as described in the previous section.

2. If you examine the polar axis assembly, you will see that the center of the R.A. shaft is hollow. The end of the R.A.

axis is threaded to accept the polar axis telescope used for polar alignment. You do not need the polar alignment

scope for this part of the process. If you have not done so already, loosen (1/2 turn) the four pier knobs.

NOTE: If you have already attached the Dec. axis, remove the sight hole cover and rotate the internal Dec. shaft by

moving the top of the Dec. axis (or the mounting plate if it is attached) to reveal the sight hole that has been drilled

into it. Now, you can look through the shaft to the other side.

3. Azimuth adjustments: Move the entire pier or tripod east or west until the mount is oriented approximately towards

the pole (an imaginary line drawn through the hollow shaft). Use the two fine azimuth adjustment knobs, one on

each side of the mount, to make fine adjustments in azimuth. You must back off the opposing azimuth knob in

order to move the other knob in that direction. Please refer to the diagram on page 3.

4. Altitude (latitude) adjustments: Loosen the altitude locking knobs. Move the polar axis up or down with the large

altitude adjustment knob located in the front of the polar axis assembly. The Tommy bar can be positioned in any of

the threaded holes located in the altitude adjustment knob. Use this bar to help you turn the knob. Please refer to

the diagrams on page 3. We have found that fine altitude adjustments also can be made by using the turnbuckle on

the north leg of our pier, if used.

5. Continue your azimuth and altitude adjustments until you can sight Polaris in the polar alignment sight hole. At this

point, you have achieved rough polar alignment, which may be sufficient for most casual visual observations. When

the R.A. motor is engaged, it will compensate for the rotation of the earth and keep the target object within the

eyepiece field of view. Your target object will slowly drift since polar alignment at this stage is only approximate.

However, you can make corrections with your hand controller, as we will discuss later.

6. Tighten the altitude locking knobs by hand.

7. Tighten the pier knobs firmly by hand.

ASSEMBLE DECLINATION AXIS

1. Attach the declination axis assembly to the polar axis with the six 5/16-18x1" socket head cap screws and washers

provided.

2. Thread the counterweight shaft into the Dec. axis.

3. Attach the cradle plate with the appropriate screws.

4. Remove the hand knob and safety washer from the base of the counterweight shaft. Add sufficient counterweights

(10 or 18 lb. counterweights are available) to the declination shaft to balance the telescope you intend to use.

Always use two hands to attach or move them on the shaft.

5. Reattach the hand knob and safety washer to the end of the declination shaft. This will help to prevent injury if

someone accidentally loosens the counterweight knob.

NOTE: Firm tightening of the counterweight knob will not damage the surface of the counterweight shaft. The pin

that tightens against the stainless counterweight shaft is constructed of brass. Likewise, a bronze sleeve that has

been press fit into the center of the counterweight will prevent marring of the shaft as you move the counterweight

up and down.

FINE POLAR ALIGNMENT – for astrophotography

Follow these instructions if you want to fine tune the polar alignment of your mount. If not, you may skip this section and

move to Operation of the Mounting.

1. Methods for fine polar alignment:

•

Polar alignment telescope – The north celestial pole can be viewed through the polar axis with the optional

polar alignment telescope included with your 1200 mount. Please read the instruction sheets "Polar

Alignment Telescope and Illuminator."

•

JMI Digital Setting Circles – Please read the instructions included with your JMI unit.

•

Star Drift method – This is the most accurate method of polar alignment; however, it is also the most time-

consuming. If you are planning long exposure astrophotos, we suggest that you use either the polar axis

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