Has anyone tired putting a GSO two speed focuser on a 203mm Orion Reflector?

  1. Joanna Sue
    Joanna Sue
    Hello,
    I was wondering if anyone has tried to put a two speed GSO focuser on a 203mm Orion Reflector? It might sound like an easy thing but from what I can determine the 203mm Orion has a fairly long stand off from the mirror compared to many which means you would either need to space the focuser out some or extend the barrel of the focuser ( which is what Orion appears to have done with their design ). I know people have likely installed Moonlite focusers on this scope but at double the price of the GSO it is a bit out of the budget for me right now. Orion offers a two speed focuser but at $199.00 I would think most people would just find the extra 60 dollars or so and get the Moonlite at that point. The reviews I have seen of the GSO are reasonably good so that is my reasoning for wanting to improve on the single speed Orion model.

    - Joanna
  2. Joanna Sue
    Joanna Sue
    GSO focuser arrived today. I suspect to make it work I would need to have an adapter plate made up which would likely cost more than just returning it and buying an Orion focuser.
    - Joanna
  3. Joanna Sue
    Joanna Sue
    More about the idea of adapting the GSO two speed to the Orion 203mm reflector. I have concluded that I would need to have an adaptor plate made up which could be made from a piece of 5/8" thick (.625) 4x4 inche piece of aluminum. ( this would serve to adapt the hole spacing of the focuser to the hole spacing on the tube assembly as welll as bring the focuser into about the same focal length as the stock Orion single speed focuser ) I have determined that such a piece of aluminum could be formed to the correct radius and then a hole bored in the aluminum plate that would equal the diameter of the hole in the Orion tube assemby - likely using a hole saw. ( continued in next post )
  4. Joanna Sue
    Joanna Sue
    Then once that is done it should be possible to drill and tap the holes in both sides of the plate to mount the plate on the tube and the focuser on the plate. A little flat black paint and it should work for the purpose of adapting this focuser to the scope. The cost of the aluminum plate ( random cut between 10-12 inches) which is available from an online source would be about 30 dollars with shipping. The cost of forming the plate at a metal shop is as of yet unknown but I am hopeful I can find someone who will do it for free. The hole saw might be a little costly but it should be possible to obtain for roughly 20 dollars I hope. The smaller holes should not be too costly to obtained a bit and tap to thread. Hardware cost for a can of spray paint and a few fasteners should be under five dollars. ( continued in next post )
  5. Joanna Sue
    Joanna Sue
    Access to a drill press, a power hack saw, and some manner tool like a Dremmel to polish the plate would be required. I will update this if I decide to undertake this project but it may be several weeks before I complete such a task as it will be dependent upon people other than myself to do some of this work for what I wish to spend....
    - Joanna
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