Jump to content


Photo

Mount Musings: Celestron VX and Atlas Pro AZ/EQ

  • Please log in to reply
12 replies to this topic

#1 jrbarnett

jrbarnett

    Eyepiece Hooligan

  • *****
  • Posts: 20446
  • Joined: 28 Feb 2006
  • Loc: Petaluma, CA

Posted 07 February 2013 - 10:53 AM

It's nice to see both Celestron and Orion refreshing their mount offerings. I have a couple of questions about each of these mounts.

First, the VX. Is the VX's base compatible with the CG-5's and Sirius'/HEQ-5's bases? The latter three mounts share a common base (along with the Orion SVP) allowing them to share accessories such as Antares piers and the Orion SVP 18" extension. It would be nice if the new mount had the same interface as these older mounts for backward compatibility.

For the Atlas Pro AZ/EQ, one thing that troubles me is its use of belts. Automobiles, too, use belts and these are a routine service item that have to be replaced periodically. I realize that the belts in a vehicle have a much harder job (high heat, high RPMs, etc.), but does anyone anticipate that the belts in the Atlas Pro may become a wear/service item down the road? In other words, will the belt drive wear more quickly than a metal-to-metal geared system?

Thanks!

- Jim

#2 jrbarnett

jrbarnett

    Eyepiece Hooligan

  • *****
  • Posts: 20446
  • Joined: 28 Feb 2006
  • Loc: Petaluma, CA

Posted 07 February 2013 - 11:01 AM

Oh, one more question: Can the "N" azimuth pin on the tripod for both mounts be re-positioned from being between two legs to being aligned with a single leg (i.e., so the CW shaft hangs directly over a "N" leg)?

Thanks!

- Jim

#3 cn register 5

cn register 5

    Viking 1

  • -----
  • Posts: 760
  • Joined: 26 Dec 2012

Posted 07 February 2013 - 02:25 PM

I think these have been asked and answered on the other AVX thread, briefly:
No, the base is different to the CG5.
Yes, the N peg can be moved - at least there's a suitable threaded hole.
As far as the timing belt goes, if it's got the same lifetime as a car timing belt it should last for several thousand years.

Chris

#4 cliffy54

cliffy54

    Viking 1

  • *****
  • Posts: 518
  • Joined: 14 Mar 2010
  • Loc: ma

Posted 07 February 2013 - 02:30 PM

Working with alot of power equipment and such I'll take a belt drive over gear or direct drive any day.

#5 jrbarnett

jrbarnett

    Eyepiece Hooligan

  • *****
  • Posts: 20446
  • Joined: 28 Feb 2006
  • Loc: Petaluma, CA

Posted 07 February 2013 - 03:51 PM

I was actually thinking of serpentine belts for the power steering and the like which typically are replaced multiple times during the life of the vehicle.

Regards,

Jim

#6 Ricky

Ricky

    Mercury-Atlas

  • *****
  • Posts: 2730
  • Joined: 09 Sep 2003
  • Loc: Nor Cal

Posted 07 February 2013 - 03:52 PM

I think most of the folks doing SiTech conversions are also using belts...

#7 cliffy54

cliffy54

    Viking 1

  • *****
  • Posts: 518
  • Joined: 14 Mar 2010
  • Loc: ma

Posted 07 February 2013 - 04:12 PM

Not to get off topic But, My Toyota is 9yrs old with 109,000 miles never had to replace the serpentine. :)

Now that I said that it will break tomorrow.

#8 bilgebay

bilgebay

    Skylab

  • *****
  • Moderators
  • Posts: 4240
  • Joined: 06 Nov 2008
  • Loc: Turkiye - Istanbul and Marmaris

Posted 07 February 2013 - 04:21 PM

:funny:

#9 rmollise

rmollise

    Hubble

  • *****
  • Posts: 15662
  • Joined: 06 Jul 2007

Posted 07 February 2013 - 04:57 PM

I was actually thinking of serpentine belts for the power steering and the like which typically are replaced multiple times during the life of the vehicle.

Regards,

Jim


Same deal...think of the stress and the environmental conditions they are subjected to compared to telescope mount parts. ;)

#10 johnpd

johnpd

    Messenger

  • -----
  • Posts: 453
  • Joined: 12 Apr 2008

Posted 07 February 2013 - 05:26 PM

Oh, one more question: Can the "N" azimuth pin on the tripod for both mounts be re-positioned from being between two legs to being aligned with a single leg (i.e., so the CW shaft hangs directly over a "N" leg)?

Thanks!

- Jim


Yes. That is the first thing I did to my Skywatcher AZ/EQ6 when I got it. Otherwise it is difficult to access the polar scope. I am not sure why they deliver it on the other side unless it allows rotating the scope without hitting the legs. I never tried it.

JohnD

#11 Peter in Reno

Peter in Reno

    Fly Me to the Moon

  • *****
  • Posts: 6052
  • Joined: 15 Jul 2008
  • Loc: Reno, NV

Posted 07 February 2013 - 05:27 PM

Bisque Paramount MX and ME mounts use tooth belts without issues. They do not use any reduction spur gears, just tooth belts. I wouldn't worry about tooth belts. Tooth belts contact better than serpetine belts and should not slip a tooth. Belts in theory are better than gears because they don't have backlash like gears do.

Peter

#12 David Pavlich

David Pavlich

    Transmographied

  • *****
  • Administrators
  • Posts: 27747
  • Joined: 18 May 2005
  • Loc: Mandeville, LA USA

Posted 07 February 2013 - 11:12 PM

I've seen the new Atlas-like Alt/Az scope and it looks like a well thought out piece of hardware. If there's one thing I wasn't really crazy about, it's the saddle. It's quite short. I think it would be better with a longer saddle, but other than that, it looks like a winner!

David

#13 SteveSMS

SteveSMS

    Vostok 1

  • -----
  • Posts: 144
  • Joined: 29 Mar 2008
  • Loc: Jersey Shore USA

Posted 13 February 2013 - 08:48 AM

Hi,

I used my new VX for the first time last night with a Vixen 102EDSS and a pair of BVs operating at 139x. I leveled, rough polar aligned , and used 2 calibration stars in set up. The mount put every object that I tried within a .47 deg fov every time. It held Jupiter steady for the half hour that I observed it. The mount is fast and quiet compared to my CG-5 ASGT. As others have already stated, the Orion extension doesn't fit, and the north peg can easily be moved to sit over a leg. All in all, I'm very happy with this mount's initial performance. Time will tell if it is durable.

Clear Skies






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics