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Thread: Testing a Refurbished 5” Newtonian (4-13-19)

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    Default Testing a Refurbished 5” Newtonian (4-13-19)



    Got a new replacement 2” focuser tube from Telescope Warehouse on Saturday and replaced the teeth-damaged focuser on my Meade 127 NT reflector with this new one. Here is the thread:

    Replacing the focuser tube on a reflector

    Average to below average transparency with some haziness, above average seeing and an 8-day old moon – good for taking this refurbished reflector out for a spin. Mounted it on an Orion Versa-Go II alt-azimuth:



    Targets:

    1. 2 Pallas (Boo, asteroid, mag=8) – easily spotted at 32x in the vicinity of mag. 2.7 Eta Bootis as the “star” that’s not supposed to be there. Second asteroid discovered, in 1802 – saw it for the first time.

    2. Castor and Algeiba (Gamma Leonis) – first time I can recall seeing doubles at high powers (162x and 170x) through a reflector. The views were better than I thought they’d be – good Airy disk pairs, although not as clean as the view from a ‘frac.

    3. Moon (8-day) - using 162x and 170x, amazing views of features such as Copernicus and the Apennine Mts. Surprised at how good the views of the moon were.

    Racking the new focuser in and out via the focuser knobs was not smooth. There are times you try ratcheting the focuser to get a sharper image but because of the spacing of the teeth on the tube and axis wheel, it overshoots past the “good” focus. Requires some racking back and forth to get a good focus. May need to try a different metal rod that better matches the teeth on the focuser tube. But overall, the replacement focuser is much more preferable to push-pulling the focuser by hand.

    Otherwise, pleased with the views that this Newtonian delivered on the moon and tight double stars. Never paid much attention to the moon or double stars using reflectors in the past.
    Terry
    ------------------------------------------------------------------------------------------------------------------------------------------------------------
    Scopes: Celestron Powerseeker 114EQ, Meade Polaris 114EQ, Orion Starblast 4.5EQ, Orion Short Tube 80A, and a whole bunch of others that get very little or no usage.

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    Default Re: Testing a Refurbished 5” Newtonian (4-13-19)

    Thanks for reporting!
    May be the focusser could use some Lithium greasing, or even a small amount of bee-wax on the rack. I presume you already have "played" with the tension and a precise alignment of the pinion-wheel.
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    Default Re: Testing a Refurbished 5” Newtonian (4-13-19)

    Glad the refurb worked, Terry.

    Yeah, I am wondering if your pinion gear is a bit "off" from the rack. Does TH sell that bit as well?
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    Default Re: Testing a Refurbished 5” Newtonian (4-13-19)

    Quote Originally Posted by bladekeeper View Post
    Glad the refurb worked, Terry.

    Yeah, I am wondering if your pinion gear is a bit "off" from the rack. Does TH sell that bit as well?
    Thanks Bryan,

    OK, I found out what happened - noticed a small yellow corrugated strip on the floor where I worked. Turns out it was a buffer between the focuser mount and tube which fell out when I replaced the tube. So I had to take off the secondary mirror vane and focuser mount again to reattach this strip on the inner top part of the focuser hole:



    Sprayed some WD-40 on the axis wheel as well:



    Once I got everything put back together, racking the focuser in and out was stiff but smooth, no longer herky-jerky. Problem solved.
    Terry
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    Scopes: Celestron Powerseeker 114EQ, Meade Polaris 114EQ, Orion Starblast 4.5EQ, Orion Short Tube 80A, and a whole bunch of others that get very little or no usage.

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    Default Re: Testing a Refurbished 5” Newtonian (4-13-19)

    Good news Terry! And thanks for the report.
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    Default Re: Testing a Refurbished 5” Newtonian (4-13-19)

    Quote Originally Posted by terrynak View Post
    Thanks Bryan,

    OK, I found out what happened - noticed a small yellow corrugated strip on the floor where I worked. Turns out it was a buffer between the focuser mount and tube which fell out when I replaced the tube. So I had to take off the secondary mirror vane and focuser mount again to reattach this strip on the inner top part of the focuser hole:



    Sprayed some WD-40 on the axis wheel as well:



    Once I got everything put back together, racking the focuser in and out was stiff but smooth, no longer herky-jerky. Problem solved.
    Stiff is fine as long as it is smooth. Greasing it and playing with tension should make it better. Congrats on getting the scope back in business! It looks good on VersaGo.

    Alos, congrats on logging Pallas.
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    Default Re: Testing a Refurbished 5” Newtonian (4-13-19)

    Terrynak:

    Congrads on the refurbished scope. What would be the max weight and length of telescope that Versago mount could carry, with out a lot of vibration?
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    Default Re: Testing a Refurbished 5” Newtonian (4-13-19)

    Quote Originally Posted by refractordude View Post
    Terrynak:

    Congrads on the refurbished scope. What would be the max weight and length of telescope that Versago mount could carry, with out a lot of vibration?
    Versago II is somewhat similar in design and capacity to ES Twilight I. From my experience up to 12lb for Maks/SCTs, up to 100mm long tube and 120mm short tube refractors. I don't have any experience with newts. Versago has sturdier arm, but ES T1 has slow motion controls, so I kept ES T1 over Versago.
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    Default Re: Testing a Refurbished 5” Newtonian (4-13-19)

    Quote Originally Posted by helicon64 View Post
    Good news Terry! And thanks for the report.
    Thanks, you're welcome Michael!

    Quote Originally Posted by Bigzmey View Post
    Stiff is fine as long as it is smooth. Greasing it and playing with tension should make it better. Congrats on getting the scope back in business! It looks good on VersaGo.

    Also, congrats on logging Pallas.
    Thanks Andrey! Looking forward to testing the smooth focuser on the next clear night.

    I don't remember my reasoning for buying the Orion Versago II some 7-8 yrs ago (my first standalone mount). All the scopes I bought then already came with mounts. I'm glad I got it though.

    BTW, it also goes by the name of the Skywatcher AZ4.

    Quote Originally Posted by refractordude View Post
    Terrynak:

    Congrads on the refurbished scope. What would be the max weight and length of telescope that Versago mount could carry, with out a lot of vibration?
    Thanks, refractordude.

    Quote Originally Posted by Bigzmey View Post
    Versago II is somewhat similar in design and capacity to ES Twilight I. From my experience up to 12lb for Maks/SCTs, up to 100mm long tube and 120mm short tube refractors. I don't have any experience with newts. Versago has sturdier arm, but ES T1 has slow motion controls, so I kept ES T1 over Versago.
    Thanks for responding to above question, Andrey. I would say for Mak/SCTs and 'fracs, your numbers are spot on.

    As for Newts, it handles my 130/1020mm Newt well - this might be the maximum size possible without noticeable shakiness. Weight load capacity of the mount is 15 lbs.
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    Default Re: Testing a Refurbished 5” Newtonian (4-13-19)

    Hi Terry,

    Love it.

    Thanks for the upgrade report and the obviously successful implementation.

    Ian
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