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  1. #1
    fras06's Avatar
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    Unhappy CPC knocking sounds



    When I slew my CPC 1100, I hear a tapping noise. When I am looking at an object (it has no problem centering the object), I can see minute jerking motions. Any solutions? It sounds as though the gears are straining.

  2. #2
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    Default

    Do you have the scoped mounted on a wedge ???? If so I would suspect that the nylon bearings in the base are now out of round and you are hearing, feeling and seeing very slight jerks... !

    Easy fix just replace the bearings in the base with steel bearings clean the race with alcohol and you're done....takes about 5 bucks worth of bearings (from memory slightly over 100..

    More info:
    1. The Yahoo CPC group.
    2. Cloudy Nights forums... which has a forum devoted only to CPC and NSGPS scopes which is very active....

    Bob G
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

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    Joe Lalumia (11-23-2010)

  4. #3
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    Default

    As Bob says this is a known issue with that mount. Somewhere on the internet is a photo web site showing the disassemble and replacement of the ball bearings.

    Maybe someone knows where to find it. (?)
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  6. #4
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    Default

    What is knocking is your fork arm gear tensioner. You can tighten the tensioner. You get more play in colder weather. Knock will probably disappear when it warms up. Mine is doing the same thing. I would not worry about it.

 

 

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