Jump to content


Photo

LXD75 Proper dual mount

  • Please log in to reply
8 replies to this topic

#1 Mittag55

Mittag55

    Explorer 1

  • -----
  • Posts: 64
  • Joined: 31 Oct 2008
  • Loc: West Amboy, NY

Posted 24 April 2009 - 09:15 AM

I have just ordered a new mount and plan for now using it for my 130 mm reflector and adding a 80 or 90 mm guide/imaging refractor on it...is there any proper physics or distribution of weights i should know about or can i just pair up the scope rings and balance the rig out.Any help or point to the right info would be helpfull.
:question:

#2 Jerry3672

Jerry3672

    Vendor - Quantum Astronomy Products

  • *****
  • Vendors
  • Posts: 500
  • Joined: 20 Jan 2008
  • Loc: Lexington NC

Posted 24 April 2009 - 12:46 PM

The best tip for that LXD75 is to have your mount a little (East) heavy. The gears always should climb a bit. If you are balanced perfectly, then the backlash will allow the mount to bounce back and forth and you will have long stars.

I have my 90mm guide scope on top of my 10 inch SN reflector. I had to add a custom weight to the end of the shaft, but you won't have that issue with a 130mm scope.

#3 Mittag55

Mittag55

    Explorer 1

  • -----
  • Posts: 64
  • Joined: 31 Oct 2008
  • Loc: West Amboy, NY

Posted 24 April 2009 - 04:21 PM

Thanks for the input...West heavy it will be.

#4 EricJD

EricJD

    Vanguard

  • -----
  • Posts: 2148
  • Joined: 24 Jul 2007
  • Loc: Chesapeake VA

Posted 24 April 2009 - 05:37 PM

Eh mate, don't you mean East heavy so that as it rotates it's always pressing against the gears? I always balance east heavy and get nice round stars at 6 minutes on my LXD75.

#5 jgraham

jgraham

    Voyager 1

  • *****
  • Posts: 13745
  • Joined: 02 Dec 2004
  • Loc: Miami Valley Astronomical Society

Posted 24 April 2009 - 09:42 PM

The LXD75 should handle that easily. Mine carries an LXD75 SN6 with a 90mm MCT as a guide scope. I usually balance mine evenly on both axis, then shift a small counter weight to make it just a tad east-heavy so it climbs against the load. Also, while guiding I use either north-only or south-only on the dec.

My standard imaging kit...

Attached Files



#6 Jerry3672

Jerry3672

    Vendor - Quantum Astronomy Products

  • *****
  • Vendors
  • Posts: 500
  • Joined: 20 Jan 2008
  • Loc: Lexington NC

Posted 25 April 2009 - 11:55 AM

Opps- You are corerct- East heavy so the gears are climbing.

#7 Jerry3672

Jerry3672

    Vendor - Quantum Astronomy Products

  • *****
  • Vendors
  • Posts: 500
  • Joined: 20 Jan 2008
  • Loc: Lexington NC

Posted 25 April 2009 - 11:56 AM

Take note of where John has his camera. I have seen his image before and use his Idea to keep the mass in the correct place. This is the best place for the camera

#8 Mittag55

Mittag55

    Explorer 1

  • -----
  • Posts: 64
  • Joined: 31 Oct 2008
  • Loc: West Amboy, NY

Posted 25 April 2009 - 06:08 PM

Thanks...this is why i read the posts...lots of neat tricks and tips to keep me out of trouble. :bow:

#9 Mittag55

Mittag55

    Explorer 1

  • -----
  • Posts: 64
  • Joined: 31 Oct 2008
  • Loc: West Amboy, NY

Posted 29 April 2009 - 04:48 PM

Well i have a 105 mm Antares coming to go on my mount so all is well. i will try it balanced at first to see how smooth the mount is and ofset East if it needs sit...Thanks all for the help






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics