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Thread: Celestron 127EQ - how to remove primary mirror

  1. #11
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    Default Re: Celestron 127EQ - how to remove primary mirror



    It is much easier to remove the end cap as one piece with the mirror still mounted.
    There is no chance of something bad happening unless you drop the entire assembly.
    We all started at the same place so do not worry about the "quality" of questions, ask if you do not know
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    Refractors: Antares 105 f/15, Bresser 102XL f/13.2, Celestron 102 f/6.5, 2-150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, Vixen SD115s f/7.7
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
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  2. #12
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    Default Re: Celestron 127EQ - how to remove primary mirror

    No, please, please, don't remove the screws in the side of the tube holding the ring. Those screws actually have nuts inside the tube. You might get them loose, but you'll never get them out.

    Its MUCH easier to just remove the screws that hold the mirror cell to the ring.

    Here is a detailed set of instructions:

    Celestron 127eq Primary Mirror
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  3. #13
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    Default Re: Celestron 127EQ - how to remove primary mirror

    So to sum up.... Gabby76 says to only remove the entire end cap, Don Alvarez assures me the tube is drilled and tapped to facilitate end cap removal, and lastly billp says NOT to attempt end cap removal as the screws are held on by nuts inside the tubes and to instead remove the three collimating screws at the base of the end cap and lift that ring assembly off the tube using the locking screws as handles?

    I can only pray this telescope offers views clearer than the conflicting instructions I'm getting - lol
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  4. #14
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    Default Re: Celestron 127EQ - how to remove primary mirror

    Just take a look down the tube, if there are nuts then you will be able to see them.
    Some telescopes do have them but I usually just reach inside and put a fingertip on it to hold it while I remove/ replace them.

    Everyone has their own way of doing things so it can cause some confusion at times

    Look it over, evaluate how you think is the easiest way for you and proceed, any of the ways we have mentioned will work.

    One thing I will say though is NOT to stand the tube up with the mirror at the top when removing the cell. If something loosens to much the mirror could drop down the tube.
    Lay it on a table and work on it. Putting a bed pillow underneath it will raise it up a bit and let you roll it easily while not supplying the mirror a reason to run away
    billp, burris and chicagorandy like this.
    Refractors: Antares 105 f/15, Bresser 102XL f/13.2, Celestron 102 f/6.5, 2-150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, Vixen SD115s f/7.7
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/Achro thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)
    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind.

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    Default Re: Celestron 127EQ - how to remove primary mirror

    Setting here looking at my 127 OTA, shining a light down the tube (don't do this), and it looks as though simply removing the three locking screws will allow the primary and it's mout to be removed. There ARE nuts on the inside, where the tube's end ring mounts, but, they are even with the primary, and, there is very little room to get to them. If you are facing the rear of the tube, you will see three sets of two screws. The screws to the right of each pair are the ones holding the mirror mount in. It does look as if there is no way for the mirror and mount to drop through when those are removed, leading me to believe the primary is glued to it's mounting plate. However you attempt to remove the primary, I would work with some latex gloves on (in case of accidental contact with the mirrors surface), and on a well padded surface.
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    David
    Celestron 8" Starhopper Dob, Celestron 127mm reflector, Meade 114NT, Edmund Astroscan, ES AR102, Sky Watcher 102mm Mak, ETX 80, ETX 60, Sears Discoverer 4 6333a, Tasco 60mm, Meade LXD75, ES Twilight 1

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    Default Re: Celestron 127EQ - how to remove primary mirror

    Ok, curiosity got the best of me, lol. I hardly use this OTA any more, so, what the heck. The screws to the right of each pair, are the collimation screws, but, they are the ones that allow removal of the primary. I removed them, with the scope facing down, and, the mirror didn't fall. Holding the cell in place, while turning the tube over, I was able to lift the tube straight up off the primary. Be careful though, there are six o rings, two per screw, that are use as the collimation "springs". I'm thinking a swap to some actual springs here would be a good idea. The o rings are a bear to get back in place (springs could just be tacked in place with a drop of CA, or super glue). I ended up using small pieces of masking tape to hold each screw in place, with the rings on them. Then carefully raised the primary up to the rear of the tube, starting each screw a few threads at a time.
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    David
    Celestron 8" Starhopper Dob, Celestron 127mm reflector, Meade 114NT, Edmund Astroscan, ES AR102, Sky Watcher 102mm Mak, ETX 80, ETX 60, Sears Discoverer 4 6333a, Tasco 60mm, Meade LXD75, ES Twilight 1

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    Default Re: Celestron 127EQ - how to remove primary mirror

    Hopefully my last "for now - lol" question. It sounds like replacing the collimation screws' rubber O-rings with springs is a sound and practical mod since I'll have the unit out anyway and will have my new Bob's Knobs in hand.

    Can someone who has already done this improvement tell me what size springs they used and from what source. Here in Chicago I have access to many Ace Hardware, Menard's and Home Depot type stores.

    Thanks in advance.

  11. #18
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    Default Re: Celestron 127EQ - how to remove primary mirror

    Quote Originally Posted by chicagorandy View Post
    Hopefully my last "for now - lol" question. It sounds like replacing the collimation screws' rubber O-rings with springs is a sound and practical mod since I'll have the unit out anyway and will have my new Bob's Knobs in hand.

    Can someone who has already done this improvement tell me what size springs they used and from what source. Here in Chicago I have access to many Ace Hardware, Menard's and Home Depot type stores.

    Thanks in advance.
    When I modded my 127 EQ I bought this box of springs from Home Depot:

    https://www.homedepot.com/p/Everbilt...B&gclsrc=aw.ds

    It included the three I needed and bunch of others that I've used over the years...
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    Default Re: Celestron 127EQ - how to remove primary mirror

    I stopped by my local Home Depot and picked up that spring assortment. I'll post a follow-up once the upgrades are completed. I did receive the following from the good folks at Celestron:

    "Hello Randy,
    Thank you for contacting Celestron Technical Support.
    The primary mirror assembly is held in place by the 3 locking screws(the ones visible from the back).
    I am sorry but I would not be able to provide any further instructions since we cannot provide support for at-home repairs.
    Johnny O
    , Celestron Technical Support "

    Like the young lass in Caddshack said - "Tanks fer nuttin'." lol

 

 
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