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gnowellsct
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Reged: 06/24/09
Posts: 5275
Re: CGEM vs. EQ6 Pro new [Re: rmollise]
      #3285642 - 08/21/09 10:01 AM

Here's one workaround (there are others):

Appendix No. 6. Short cut to putting the “little circle” in your finder scope in the correct position. Polaris is just off true north, as is well known. The SP/GP/CG5 polar scopes come with detailed instructions about how to use the dial on the RA axis to use date and time to move the little circle in the finder to the correct position. This is necessary because Polaris is “off” true north in a different direction (from the Earth) depending on where it has rotated relative to true polar north. Here is a shortcut that works. 1. Find Cassiopeia. Look at the star that is the left-most (when seen as a “W”) or the right-most (when seen as an “M”). 2. Draw a line from that star in Cassiopeia to the horizon. That line points to six o’clock; the left most star of the “W” is the center of the clock. 3. Find Polaris. What hour is Polaris indicating relative to your reference star in Cassiopeia? 4. If Polaris is at 10 o’clock, put your little Polaris circle at 4 o’clock. If Polaris is at 12 o’clock, put the little circle at 6 o’clock. If Polaris is at 4 o’clock, put the little circle at 10 o’clock. The pattern here is that the “little circle” should be set exactly six hours off the “Cassiopeia clock” you established in steps 1-3.

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yg1968
Carpal Tunnel


Reged: 01/26/04
Posts: 1859
Re: CGEM vs. EQ6 Pro new [Re: gnowellsct]
      #3285757 - 08/21/09 11:17 AM

Here is another work around. Here is a small software program that locates Polaris' position in relation to the North celestial pole (NCP). Useful for polar alignment.

http://manastro.co.uk/software/polar204.zip

You can use this program to place Polaris on the red circle in your polar scope. The HC of the EQ-6 Pro also tells you the hour angle of Polaris. But this software gives you a better visual idea of where Polaris should be.


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o1d_dude
o1der than dirt


Reged: 10/03/07
Posts: 2534
Loc: The Wolfpack
Re: CGEM vs. EQ6 Pro new [Re: yg1968]
      #3288664 - 08/23/09 02:50 AM

I use PolarFinder 2.0 at home as well. Because I use it so much, I put the icon right on my desktop. LOL!

When I'm out and about and my PC is at home, I use Dr. Clay's "Kochab Clock" method an explanation of which can be found H E R E . You'll have to scroll down to see the diagram.

--------------------
Kit

'Dont worry about what telescope you own, or its quality. Just get out under the night sky, and enjoy Gods wondrous universe.' - Thomas M Back


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M54
member


Reged: 11/17/08
Posts: 16
Re: CGEM vs. EQ6 Pro new [Re: o1d_dude]
      #3288769 - 08/23/09 06:18 AM


I searched youtube and found few vids demonstrating EQ5/6 mounts. Those seem to be pretty quiet when slewing But there is a significantly nasty sound when starting/stopping slewing (I wonder what that sound would be when operating well below -10C). Is that common with EQs and could changing the lubricants/bearings cure it?

No vid found showing CGEM.
There seem to be some threads here discussing over this noise issue which is pretty important to me (neighbor's bedroom less than 30ft away).
I might accept slightly higher slewing noise but start/stop should be free of extra noise.

BR Ben


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WarrenS
Carpal Tunnel


Reged: 03/04/08
Posts: 1622
Loc: Orange County New York
Re: CGEM vs. EQ6 Pro new [Re: M54]
      #3288895 - 08/23/09 08:58 AM

Significantly nasty can be a relative term. My Atlas(EQ6) does make the "coffee grinder" noise when starting and stopping slewing but it's so subdued it's only really noticeable compared to the dead silence when tracking. Early on after I first bought the mount I'd have to put my ear right up against it to make sure it was still tracking!
If your neighbors' bedroom window is less than 30ft away I would think you hear a lot more noise coming out of there than they'd be hearing from your mount! YMMV

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Warren

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Skylook123
Postmaster


Reged: 04/30/05
Posts: 7171
Loc: Tucson, AZ
Re: CGEM vs. EQ6 Pro new [Re: WarrenS]
      #3289005 - 08/23/09 10:28 AM

The start/stop rattle is normal for stepper motors on ramp up and ramp down between rest and full speed, and GOTOs for this mount only happen at full speed. I haven't heard of any temperature influence. Lube and bearings have no relation; those only affect the tracking precision.

The noise can be minimized by fine-tuning the mesh of the gear train and tweaking the worm alignment. Instructions are all over the EQ6 Users' Yahoo site, as well sites of some posters here and other places. Fairly easy to do, but the final few milimeters of adjustment of both the mesh and the worm can be frustrating; locking down the final location can shift the setup and result in binding or looseness that might be worse than it was at the start. Some folks get lucky and are done in less than 30 minutes including removing/reinstalling the motors to adjust by feel, some chase it for hours and hours. It's a task to keep the obsessive-compulsive tinkerers busy for a long time.

--------------------
Jim
South Rim Coordinator
Grand Canyon Star Party
gcsp[at]tucsonastronomy.org

Equipped with his five senses, man explores the
universe around him and calls the adventure
Science - Edwin Hubble


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rmollise
Postmaster


Reged: 07/06/07
Posts: 12033
Re: CGEM vs. EQ6 Pro new [Re: M54]
      #3289316 - 08/23/09 01:47 PM

Quote:


I searched youtube and found few vids demonstrating EQ5/6 mounts. Those seem to be pretty quiet when slewing But there is a significantly nasty sound when starting/stopping slewing (I wonder what that sound would be when operating well below -10C). Is that common with EQs and could changing the lubricants/bearings cure it?

No vid found showing CGEM.
There seem to be some threads here discussing over this noise issue which is pretty important to me (neighbor's bedroom less than 30ft away).
I might accept slightly higher slewing noise but start/stop should be free of extra noise.

BR Ben




It's not at all "nasty." "Barely audible" is more like it. If you want "nasty" have a listen to my ETX 125...



--------------------
Uncle Rod

Rod's Latest Book:
Choosing and Using a New CAT
Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/


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