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Thread: eq8 mount ra dying

  1. #1
    yobbo89's Avatar
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    Default eq8 mount ra dying



    I packed my gear up before i went to japan for a month and decided to re set it all up again ,for the pass 3 days i'm having problems with the ra, i've pulled it apart incl the worm drive, cleaned and re greased it all and no luck with it,

    i'm getting a large rocking backwards and forwards in my images and guiding wants to chase this rocking.

    even if i make the weight balanced and or make the weight on the east side (counter weight side) heavier, me being from the southern hemisphere my polar align/mount facing is south. which should help indicate what side the mount needs to be heavier on to reduce periodic error.

    The only thing that almost eliminates this rocking is if i make the mount ,scope side heavy (west side) (the mount tracks towards the west so it's pulling the weight) , it will only work with a large amount of weight ie if i took the clutch of it will swing down with a large force in a split second.

    The ra operates on a large disc with teeth via a worm drive and the worm drive is operated via belt pully/motor.

    i've gone through and adjusted the worm drive, there's a bad spot (tight) on one side of the large disc drive which is "typically normal" .. i've adjusted the drive to that tight spot,

    The large ra disc will rotate 360+ deg with the clutch loosen off , it is a free spinning piece ,now with the clutch loos the worm gear will bite in one spot, but with the clutch tightened it will not bite in that spot, this seems to be indicating that the shaft might be worn out and when the clutch is enabled it is pushing down the ra cog and is making it less elliptical or centering it a bit more correctly..

    so it might be, the motor thats buggered, the worm gear, the ra disc or the shaft it sits on.

    I thought about swapping the ra and dec motor but they might be different, they have a different number on them but are the same size.

    appreciate any ideas

    edit: here is a look at the large gear from this guide on youtube https://youtu.be/wLbiok7WJjE?t=1751
    Last edited by yobbo89; 04-28-2019 at 02:43 PM.
    scopes :gso/bintel f4 12"trust tube, bresser messier ar127s /skywatcher 10'' dob
    cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7
    mounts : eq6 pro/eq8
    filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, Thousand Oaks Solar Filter.
    extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel

  2. #2
    yobbo89's Avatar
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    Default Re: eq8 mount ra dying

    I've contacted skywatcher aus, they said they might be able to do warranty, it's a maybe because ive opened it, if not they said they can sell me parts
    scopes :gso/bintel f4 12"trust tube, bresser messier ar127s /skywatcher 10'' dob
    cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7
    mounts : eq6 pro/eq8
    filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, Thousand Oaks Solar Filter.
    extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel

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    Default Re: eq8 mount ra dying

    Does not sound good -- I mean just trying to figure out which part (parts?) needs replacing.

    Sorry I can't help.

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    Default Re: eq8 mount ra dying

    pulled apart the mount and re greased it again (twice in two days ), i checked the worm with some digital calipers, it doesn't look bent or worn out, heated up the grease with hot air to help flood out the bearings on the worm, the mount feels smoother while rolling the worm by hand against the ra cog ,didn't get a chance to guide as the clouds rolled on out.

    examined the main cog and it looks ok, the belt looks a little old and a bit stretchy with worn sides, so that and the motor might be my next culprit , i might just order some spare parts once sky watcher get back to me with a quote
    scopes :gso/bintel f4 12"trust tube, bresser messier ar127s /skywatcher 10'' dob
    cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7
    mounts : eq6 pro/eq8
    filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, Thousand Oaks Solar Filter.
    extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel

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    Default Re: eq8 mount ra dying

    Hopefully it is nothing to major and the mount is operating properly for you right away.
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    Default Re: eq8 mount ra dying

    little update, the re greasing the worm bearings while warming them up helped a bit, i got down to 0.8-1.0 rms error, annoying high spot on the gear is getting to me, i think i'll rotate it to the bottom and leave the clutch perm engaged as the tracking does not require the full 360 deg of the cog, still in need for a spare bearings and rubber belt ,can't hurt , it might spruce things up a bit
    Gabby76 likes this.
    scopes :gso/bintel f4 12"trust tube, bresser messier ar127s /skywatcher 10'' dob
    cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7
    mounts : eq6 pro/eq8
    filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, Thousand Oaks Solar Filter.
    extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel

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    Default Re: eq8 mount ra dying

    i've been sending/receiving emails with skywatcher/tasco and turns out they don't have any worm drives in stock atm and it will take at least 3 months to ship the parts that they have in stock ....

    They recommend i try elsewhere ..

    anyway i have purchased my second eq8, i would of liked to get something a bit more accurate in machining/higher end but australia is very limited ,one company had 10 microns here for pre order with an end of the year shipping...

    i'm swinging 32 kg at 0.64 a/res

    i was looking at a paramount mx+ but they are 16.6 k! without a tripod and addition weights, so i guess i'll stick with a new eq8 that way i can get another secondhand car and 2 new telescopes! which i need!
    scopes :gso/bintel f4 12"trust tube, bresser messier ar127s /skywatcher 10'' dob
    cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7
    mounts : eq6 pro/eq8
    filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, Thousand Oaks Solar Filter.
    extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel

  8. #8
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    Default Re: eq8 mount ra dying

    my AYOmaster is between 4-6 months away. The joys of living in Terra Australis Incognita.
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  9. #9
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    Default Re: eq8 mount ra dying

    very nice, why the ayomaster ? need the extra capacity ? it looks sturdy, i've also looked elsewhere for mounts overseas in fact i might commit to the new mesu 200 mkll from netherlands,i've already enquired to cancel my second eq8 order .. i hope our low australia dollar and high gst/import tax is worth it, I see that testgear has one who is frequent on the forums..

    The eq8 is fine but if one is doing 20-30 min subs then some of those are ruined from pe, i don't know how people manage with long fl scopes
    scopes :gso/bintel f4 12"trust tube, bresser messier ar127s /skywatcher 10'' dob
    cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7
    mounts : eq6 pro/eq8
    filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, Thousand Oaks Solar Filter.
    extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel

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    Default Re: eq8 mount ra dying

    Might just need to be adjusted. Check the worm gear for end play. Then worm to ring gear mesh.
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