Jump to content


Photo

Help with a Meade DC drive

  • Please log in to reply
24 replies to this topic

#1 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 18 November 2012 - 12:36 PM

Hi All,

I have a basket case Meade drive tha needs assembly and need help getting it going.
I do not know how to assemble the parts as this is the way I got the mount.
Would like to get this going to be able to take to darker skies.
Photos comming later today as I gather up the parts...

Many thanks in advance,
Mike

#2 Geo.

Geo.

    Mercury-Atlas

  • *****
  • Posts: 2845
  • Joined: 01 Oct 2008
  • Loc: Upstate NY

Posted 19 November 2012 - 12:23 PM

Meade's been making DC powered scope since 1985. Any idea of which model we are talking about?

#3 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 19 November 2012 - 08:41 PM

Hi George,

I have a pic here..
Don't know what model though.
Hope this helps.

Thank You much,
Mike

Attached Files



#4 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 19 November 2012 - 08:45 PM

I have no idea why the white paint blocks some of the "windows" and, the little piece has slots and don't know how or where it mounts to...

Mike

#5 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 20 November 2012 - 08:48 PM

A close up of the two parts that need to go to the right place...Can take other pictures as needed...

Attached Files



#6 Darenwh

Darenwh

    Mercury-Atlas

  • -----
  • Posts: 2824
  • Joined: 11 May 2006
  • Loc: Covington, GA

Posted 20 November 2012 - 10:17 PM

That looks like part of an Autostar or similar system. The black disk with the little windows is part of an optical encoder and most likely was glued to the silver circle you are pointing at. You can see glue residue on the silver disk. I think this needs to be glued centered on the disk. The other part I am not sure about. Good luck.

#7 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 23 November 2012 - 04:13 PM

Thank You Daren,

I'm with you on where the disc goes... and hoping someone can post a pic of their drive to show where all the parts go
to see if there is something missing on mine.

Mike

#8 Geo.

Geo.

    Mercury-Atlas

  • *****
  • Posts: 2845
  • Joined: 01 Oct 2008
  • Loc: Upstate NY

Posted 24 November 2012 - 10:33 PM

This looks like the DC RA drive from the Meade Starfinder Newt's German mount. The drive system is similar in design to the LX50s. Some of these and some LX50s have the paint on the interrupter disk and some don't The other part is a slot mask and it has to be placed between the interrupter and the IR detectors. Its placement is somewhat critical in the LX200, which uses two sets of emitters and detectors to provide rotation direction data. Not sure how critical it is here. The blob of paint makes me think that it can't all that critical.

Here's the LX50 circuit:

Attached Files



#9 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 24 November 2012 - 10:46 PM

Hi George,

Thanks again...
There's also a port where a controller plugs in (I don't have the controller though).

I placed the two parts in the correct (I think) location and the wheel spins and stops, spins and stops continuosly.
Do I need to get the controller part to have it track correctly?

Mike

Attached Files



#10 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 24 November 2012 - 10:47 PM

Another pic of the mount...

Attached Files



#11 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 25 November 2012 - 12:37 PM

Oh,

What hand controller is used with this, and does anyone
know where one can be found?

Thanks again,
Mike

#12 Geo.

Geo.

    Mercury-Atlas

  • *****
  • Posts: 2845
  • Joined: 01 Oct 2008
  • Loc: Upstate NY

Posted 25 November 2012 - 01:08 PM

The encoder out is for the Magellan DSC system. You'll note that the LX50 had provision for RA and Dec encoders, ST-4 autoguider and a electronic hand control. I've done some poking around and think that the LX50 used a subset of the LX200 protocol for the controller to PIC communications. The ETX EC (electronic controller) was a development of the LX50's unit. Also the ETX motor control boards (MCB) bear some semblance to the LX50's. In the DS2000 mounts the ETX's two MCBs have been reduced to one board. so there is a logical progression from the 826 mount's electronic to the LX50 and the later goto scopes.

The ETX electronic controller has quite a few features and it may be easier to install an ETX/DS MCB to your motor than get the old system working.

Here's the underside of the LX50:

Attached Files



#13 Carl Kolchak

Carl Kolchak

    Apollo

  • *****
  • Posts: 1074
  • Joined: 02 Aug 2006
  • Loc: Northeast, Florida

Posted 25 November 2012 - 02:05 PM

Hi Mike,

I have a Meade 6" f/8 Starfinder EQ. I'm not sure but I think my DC motor is similar. Here are some images of the motor on the Starfinder 6" f/8:

Posted Image
Shows motor/assembly with cover removed

Posted Image
This shows the front of the motor cover with power switch and ra connector, etc

Posted Image
Detail inside of motor cover

Posted Image

Yellow square shows your fan like part. There is nothing filling in the little windows on that part.

peace & clear skies

#14 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 25 November 2012 - 05:08 PM

Thank you George,

Thinking to get the controller to get it going correctly.
Maybe it's not even needed for tracking speed, just turn on (that would be ideal).
I'm thinking the controller would be for faster slewing speeds and not needed for casual viewing in the back yard.

I really appreciate the time you gave, and the great photos too,
Mike

#15 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 25 November 2012 - 05:16 PM

Thank you Carl,

Great photos...
I appreciate your time too!
I'm going to put up another photo to show where the parts were placed, mine does not have two wheels, just one plus that other little window part.
I'll try to talk you out of your mount if I can't get this one going...I have lots of stuf to trade...LOL!

You guys are great,
Mike

#16 Carl Kolchak

Carl Kolchak

    Apollo

  • *****
  • Posts: 1074
  • Joined: 02 Aug 2006
  • Loc: Northeast, Florida

Posted 25 November 2012 - 07:15 PM

Hi Mike,

The way my Meade DC motor works is I turn it on and it tracks whatever object I have in the EP.

The only controller that works for my EQ mount is a Magellan I or a Magellan II. I have installed the Magellan I.

I'll try to talk you out of your mount if I can't get this one going...I have lots of stuf to trade...LOL!


I don't think I could be persuaded to trade off this mount, too happy with it. :)

peace & clear skies

#17 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 25 November 2012 - 07:45 PM

I don't think I could be persuaded to trade off this mount, too happy with it. :)


That's the main thing here, be happy...
Still gonna put up a couple pics with the remaining questions in a bit...

Always, Thanks,
Mike

#18 Geo.

Geo.

    Mercury-Atlas

  • *****
  • Posts: 2845
  • Joined: 01 Oct 2008
  • Loc: Upstate NY

Posted 26 November 2012 - 02:43 PM

Mine's AC. Just plug it in :jump:

#19 Starman1

Starman1

    Vendor (EyepiecesEtc.com)

  • *****
  • Vendors
  • Posts: 22873
  • Joined: 23 Jun 2003
  • Loc: Los Angeles

Posted 26 November 2012 - 03:15 PM

This is pulling up cobwebs from the memory bin, but I think the white paint on the encoder disc was intended to stop the slewing scope when it had traveled too far, i.e. to prevent the EQ mount from continuing until the OTA slammed into the mount. That would be roughly 90 degrees of travel on most EQ mounts, and it appears the white paint covers about that much in the way of "ticks".
However, like I said, this is trying to remember helping someone overhaul a mount 25 years ago.
George is the man if you need help on this.

#20 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 28 November 2012 - 10:40 AM

Mine's AC. Just plug it in :jump:


Thanks George,

Mine's DC (as you know) and will turn it on (hopefully this weekend).
Still going to get up a couple pics to show where the parts were placed by me...

Mike

#21 Michael Cave

Michael Cave

    Ranger 4

  • *****
  • Posts: 315
  • Joined: 24 Oct 2010
  • Loc: St. Louis, MO

Posted 28 November 2012 - 10:42 AM

Thank You Don,

Going to put up some pics to show the progress...
I'll be doing this tonight after work, around 6:00p central,

Mike

#22 bob midiri

bob midiri

    Mercury-Atlas

  • *****
  • Posts: 2763
  • Joined: 17 Jun 2004
  • Loc: pa 19320

Posted 29 January 2014 - 06:04 PM

I have a Meade DC drive on a Meade 8" starfinder. For some reason, my motor seems to be racing..on 12 volts. Jupiter just slews out of the FOV in seconds using low power. First I thought I wasnt balanced, then I realized I was balanced cause when I turn off the motor, I don't get any drift. Anu ideas on why this motor is racing? Thanks Bob

#23 herrointment

herrointment

    Aurora

  • *****
  • Posts: 4599
  • Joined: 12 Mar 2011
  • Loc: North of Hwy. 64

Posted 29 January 2014 - 08:14 PM

When used with the handbox for the DSC system you could run the motor up to X16 by holding down a button.

That's all I've got...

#24 Gil V

Gil V

    Viking 1

  • -----
  • Posts: 640
  • Joined: 09 Sep 2012

Posted 30 January 2014 - 10:12 AM

I had a problem where my Starfinder EQ drive would vary in speed, objects would move across the field of view at random, varying speeds.

It was kinda funny, actually.

Meade sent me a replacement motor/worm gear assy. That was in 1995, so I don't think you'll have that option anymore...

#25 bob midiri

bob midiri

    Mercury-Atlas

  • *****
  • Posts: 2763
  • Joined: 17 Jun 2004
  • Loc: pa 19320

Posted 30 January 2014 - 11:35 AM

Yeh Gil, I did some research and found out that in 1996, Meade was having issues with these DC drives and shipped out new ones to owners. This scope and mount was purchased in Feb 1996 and delivered end of March 1996.. the owner used it twice, and in fact the old batteries were still in battery pack (batteries exp jan 2000!!)..so apparently the original owner got frustrated with the mount and never used it again. Bob






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics