Gregk
Pooh-Bah
Reged: 11/19/06
Posts: 1450
Loc: Gilbert Arizona
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Hi,
Recently I ordered a Imaging source BW Planetary camera and noticed allot of vibration just by tapping the concrete
with my foot. My mount is up on a locking 4 inch hard wheel dolly since I have allot of back/neck issues....I wheel it out onto the driveway when skies permitting.
This explains why my mount would react during guiding especially in the DEC when I would sit back down from a break. Never had seen this with the EQ-6 since it's such a heavy beast....
I was thinking of hanging a 10lb or 7 lb weight from the assessory tray. I've heard others use sand in the tripod legs and some use a mount extension and shorten the legs of the tripod.....Comments welcome
Where would I get an extension for the CG-5 ?
Regards
Greg
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www.azspaceblog.com/
Orion Star Shoot Pro OSC
Oiron Star Shoot II OSC
Celestron Cg-5 ASGT mount
Celestron ED80 Piggy back with william Optics 66mm APO
Celestron 6" SCT Piggy Back with william Optics 66mm APO
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mclewis1
Thread Killer
Reged: 02/25/06
Posts: 3942
Loc: New Brunswick, Canada
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Greg,
Weights are a good start. A popular pier extension for the CG-5 is the Orion 16" extension for the SVP mounts. It bolts right up to the CG-5, adds 16" of height and some extra weight (it's made of steel so it's pretty substantial).
Is the dolly just locking the wheels? Is there any way of adding leveling bolts that would lift the wheels off of the ground? Even locked some wheels still have enough play in them to cause problems with a scope.
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Mark
C11, C6, APM/TMB115, and AT80ED - Tandem mount CGE and CG-5A, WO EZ-Touch and AT Voyager
25x100s and 8x56s, T-Mount Light, Mark 1 eyeballs - Modded 350D, DSI-P, SPC900, Mallincam
Just because you can doesn't necessarily mean that you should
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o1d_dude
o1der than dirt
Reged: 10/03/07
Posts: 2115
Loc: The TV/SV Wolfpack
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I want to say that my Orion 16" pier extension weighs about 16 lbs or so but don't quote me on it.
It adds a great deal of "substance" to my mount package.
In lieu of a rolling dolly, I use anti-vibe pads and on my concrete patio I see no vibrations at all.
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Kit
'Don’t worry about what telescope you own, or its quality. Just get out under the night sky, and enjoy God’s wondrous universe.' - Thomas M Back
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Patrick
Postmaster
Reged: 05/16/03
Posts: 7802
Loc: Franklin, Ohio
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Have you tried vibration suppression pads?
Patrick
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10" f/6 Truss Tube Newtonian
Celestron C6S-GT SCT
AT66ED Refractor
Oberwerk Ultra 15x70 Binocular
475B Geared Tripod & 501HDV Head
Celestron Regal 8x42 Binocular
Canon XSi; Meade DSI;SPC900-NC
Vixen GP2 Photo Guider Mount
My Astronomy Pages
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bebert
sage
Reged: 07/21/08
Posts: 247
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Quote:
I was thinking of hanging a 10lb or 7 lb weight from the assessory tray.
I used this method on my old C8 tripod. I filled a 8" diameter PVC pipe with cement and sealed it up placing a hook at one end. I placed a hook on the bottom of the tripod tray for hanging the weight. It worked very well.
My CG-5 is a different beast though as it lacks a substantial tray. I usually set up in my driveway and I got to looking around one night and realized that I could take advantage of the expansion joints in the concrete slabs to isolate my rig from vibrations caused by my walking around, etc. So, now I can move around freely without inducing vibrations. I do mostly photographic work - if you're visual then this isn't going to work for you.
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Celestron C8
Orion 80 ED
Vixen 70s for guiding
CG5-ASGT
SSAG
PHD Guiding
Canon 300D(a)
Celestron 0.63 focal reducer
WO 0.8x FF/FR version II
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Gregk
Pooh-Bah
Reged: 11/19/06
Posts: 1450
Loc: Gilbert Arizona
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Thanks for the Suggestions Not sure the pads would fit the profile of the Dolly...Adding legs/struts to the dolly would help for sure..I should upgrade
I have 8 squares in my driveway apron which I only use one
I do imaging Primarily
I'm a little confused about how one tightness down the mount
with the extension added. The shaft that runs up into the bottom of the mount now runs into the bottom of the extension to tighten down the mount??
Thanks
Greg
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www.azspaceblog.com/
Orion Star Shoot Pro OSC
Oiron Star Shoot II OSC
Celestron Cg-5 ASGT mount
Celestron ED80 Piggy back with william Optics 66mm APO
Celestron 6" SCT Piggy Back with william Optics 66mm APO
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gnowellsct
professor emeritus
Reged: 06/24/09
Posts: 729
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Quote:
Hi,
Recently I ordered a Imaging source BW Planetary camera and noticed allot of vibration just by tapping the concrete
with my foot. My mount is up on a locking 4 inch hard wheel dolly since I have allot of back/neck issues....I wheel it out onto the driveway when skies permitting.
This explains why my mount would react during guiding especially in the DEC when I would sit back down from a break. Never had seen this with the EQ-6 since it's such a heavy beast....
I was thinking of hanging a 10lb or 7 lb weight from the assessory tray. I've heard others use sand in the tripod legs and some use a mount extension and shorten the legs of the tripod.....Comments welcome
Where would I get an extension for the CG-5 ?
Regards
Greg
My standard suggestion on this sort of issue with the CG5 (had one, long time ago) is to use a pier.
You take it to a lake or ocean, find a pier, walk out, and throw it off the end.
I spent a lot of time trying to get a CG5 to behave like a proper mount. If you have one with the steel legs and are still trying to get it to work, then ultimately this may not be the mount for you. If its the older version, and you find yourself trying to jam sand or cement into extruded aluminum legs its the mount telling you that something is wrong. Even Celestron "admittted it" by brining out the steel legs for ASGT.
I thought the suppresion pads made things better without making things good.
Good luck,
Greg N
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"Aperture will get you through times of no money better than money will get you through times of no aperture."
featuring selected astrojunk:
bunch o' widefield eyepieces
bunch o' narrowfield eyepieces
couple o' Barlows
couple o' scopes
couple o' mounts
couple o' tripods
and a pier 'n' stuff
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Gregk
Pooh-Bah
Reged: 11/19/06
Posts: 1450
Loc: Gilbert Arizona
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Hi Greg
I have the ASGT with the 2 inch Steel legs.......
It guides properly as long as there is no movement on or
near the mount When I get up and down from my chair
It gets upset and the dec starts oscillating on the PHD graph then settles down. I will try tonight suspending a 11 lb counters from the tray and go from there.
Thanks
Greg K
--------------------
www.azspaceblog.com/
Orion Star Shoot Pro OSC
Oiron Star Shoot II OSC
Celestron Cg-5 ASGT mount
Celestron ED80 Piggy back with william Optics 66mm APO
Celestron 6" SCT Piggy Back with william Optics 66mm APO
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Takman
super member
Reged: 02/25/09
Posts: 193
Loc: Maple, ON - Canada
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Quote:
Have you tried vibration suppression pads?
Patrick
I second this idea. VSPs work surprisingly well. However, they are not miracle workers.
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Takahashi TOA-130F
Celestron C-11/C-8 with FASTAR
William Optics Zenithstar 66 SD/ED Petzval
Astro-Physics Mach1 GTO/Celestron AS-GT
TeleVue Naglers 26mm, 13mm, 7mm and 3.5mm
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gnowellsct
professor emeritus
Reged: 06/24/09
Posts: 729
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Quote:
]Have you tried vibration suppression pads?
Patrick
I second this idea. VSPs work surprisingly well. However, they are not miracle workers.
One of the problems with the suppression pads is that where you need them most--on asphalt or concrete--they tend to be the most slippery. So as the scope moves the torque can compromise the pointing accuracy by twisting the mount in azimuth.
I prefer wood tripods these days, although there are certain aluminum mounts: losmandy tripod, adn the ATS piers, which are fine.
regards
Greg N
--------------------
"Aperture will get you through times of no money better than money will get you through times of no aperture."
featuring selected astrojunk:
bunch o' widefield eyepieces
bunch o' narrowfield eyepieces
couple o' Barlows
couple o' scopes
couple o' mounts
couple o' tripods
and a pier 'n' stuff
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Patrick
Postmaster
Reged: 05/16/03
Posts: 7802
Loc: Franklin, Ohio
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Greg,
I suggested the vibration suppression pads because of your unique situation. Greg N's comments aside, the CG5 can be a good mount if you know it's limitations.
When imaging, you should really try to keep the legs unextended. If you need to raise the mount, an extension is probably the right idea. There's a thread HERE that talks about using an Orion SVP 16" pier extension with the CG5.
If there's anyway that you can get off the concrete onto solid ground, it would probably help too.
Patrick
--------------------
10" f/6 Truss Tube Newtonian
Celestron C6S-GT SCT
AT66ED Refractor
Oberwerk Ultra 15x70 Binocular
475B Geared Tripod & 501HDV Head
Celestron Regal 8x42 Binocular
Canon XSi; Meade DSI;SPC900-NC
Vixen GP2 Photo Guider Mount
My Astronomy Pages
|
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