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ASSEMBLE THE TRUSS TELESCOPE:

If you have any questions, or see anything I haven't covered, please let me know and I'll add that information. Simply email me at densteele@dobstuff.com and I'll follow up and quickly as I can.

Call or email any time
tel: 650-315-6578

Thanks, Dennis

 



1) A note about installing the secondary in the Destiny spider. Notice that the "spring" goes on the TOP of the assembly. If you need to move the secondary up/down along the optical axis, you can do so with the collimation thumb screws. Finally, tighten the center thumb-nut for a firm assembly.

Collimation is easy, that is you just adjust the thumb screws without the need to "loosen two, tighten one"!! Easy.



2) If you're using a Dobstuff mirror cell, I've put a "register" mark on one side of the mirror cell.  Sometimes, slight variations occur, so use this register mark to insert the cell into the mirror board (see #3 below).

If I've installed your own mirror cell, it will still have a register. Usually on the "side" of the cell near one of the collimation bolts.

NOTE: Once the mirror and cell are installed onto the mirror  board, tighten the thumb knobs until the springs are "FULLY COMPRESSED".  Then, as you collimate the telescope, simply "release" some of the tension.

I like to use a 2" laser collimator and/or a collimating eyepiece.
 

 33) The mirror board register mark. Sometimes it's a "punch" into the wood, but easy to see.
 



 4) The altitude bearings are held in place with a vertical strut on the left and right side of the telescope (as seen from the rear).

Slide the strut down through the hole and tighten. You may it a bit snug. Just "turn and push" until it's in place.


5) The vertical strut is in place. The bolt, below, is captive -- so there is not need to worry about it turning or falling off.

NOTE: During transport, you can leave the vertical struts into place. There is no need to remove them each time the telescope is dis-assembled.


6) The altitude bearing is in place. The lower support uses a 2" carriage bolt and wing nut. The upper clamp takes the knob. Again, as there may be variations during construction, there is a "left" and a "right" side. Each clamp is marked on the side.

In this photo, the alt bearing is on the "left" side of the mirror box.

NOTE: Be sure that the "curved edge" of the clamp is on the inside and toward the CENTER of the primary.


7) At this point, with the altitude bearings installed, you can now place the mirror box onto the rocker box.

From here, you'll install the truss tubes and top ring or UTA.


8) As you install the trusses, don't forget to place the "counterweight" onto one of the trusses "away from the eyepiece". This will help balance different weight eyepieces if needed.  Most often it isn't needed.

9) Finally install the top ring or Upper Tube Assembly.

NOTE: The way the telescopes are made, the top ring or UTA can be installed with the eyepiece on either side. I've built the scope so the focuser is on the "left" as seen from the rear.

NOTE: Leave the thumb screws "loose" as you fit each of the truss tubes into the block. Then tighten "slightly". No need to over tighten -- just firm enough to avoid any slipping or movement.

For more information or help, call any time:
--Dennis Steele
--Tel: 650-315-6578 (anytime)
--Email: densteele@dobstuff.com		  

 

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