Jump to content


Photo

Finally finished my 76x1218mm "Jaegertron"

  • Please log in to reply
32 replies to this topic

#1 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:18 PM

Last weekend I finally finished my 76x1218mm "Jaegertron" whose cell design I first discussed in this earlier thread:

http://www.cloudynig...5666072/page...

Sadly, I still haven't had decent weather for the first star test. I began with a Unitron Model 140 tube, focuser, and dew shield and a Jaegers 83mm x 1278mm air spaced objective.

The final telescope wound up being a tad heavier than my complete Unitron #140. Here it is lying on the daybed in the study so you can get an idea as to how long the OTA is.

Here she is:

Attached Files



#2 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:19 PM

Here's the business end with the objective in place.

Attached Files



#3 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:20 PM

Here's the custom 1.25 inch visual back that goes into the standard Unitron #140 focuser.

http://www.cloudynig...5830263/page...

Attached Files



#4 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:22 PM

On the bench during final assembly.

Attached Files



#5 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:23 PM

Dew shield is press fit. Lots of dirty, greasy fingerprints ;)

Attached Files



#6 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:25 PM

Had to use the lathe to open up the previously threaded dew shield for a nice snug press fit.

Attached Files



#7 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:28 PM

Here's the finished objective cell (see previous thread).

Attached Files



#8 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:29 PM

Down the tube. Note the thread in retaining ring.

Attached Files



#9 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:31 PM

The tube is tapped to hold the cell without requiring nuts. Here you see the cell in the indexing chuck on the milling machine to drill holes at 72 degrees apart to match those in the tube.

Attached Files



#10 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:45 PM

For your comparison.

Attached Files



#11 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:47 PM

2

Attached Files



#12 starman876

starman876

    Fly Me to the Moon

  • *****
  • Posts: 6313
  • Joined: 28 Apr 2008
  • Loc: VA

Posted 09 May 2013 - 01:48 PM

you will find a very nice star test. I have one of those lenses, but and 800mm version, I put in an old cresent scope I have. Lens fit perfectly in the cell. Had to cut off a few inches of the tube. Very nice veiws. you will be very happy.

#13 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:49 PM

3

Attached Files



#14 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:50 PM

4

Attached Files



#15 starman876

starman876

    Fly Me to the Moon

  • *****
  • Posts: 6313
  • Joined: 28 Apr 2008
  • Loc: VA

Posted 09 May 2013 - 01:51 PM

I did not notice, but did you blacken the inside of the lens cell? If you do not it will cause reflections.

#16 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 09 May 2013 - 01:53 PM

Thanks Johann. Yes, I have the flat black opaquing paint. I will do that as I finish fritzing with it.

#17 bremms

bremms

    Mercury-Atlas

  • *****
  • Posts: 2766
  • Joined: 31 Aug 2012
  • Loc: SC

Posted 09 May 2013 - 02:14 PM

Hope you get to look through it soon. Glad you got it mounted and on the tube. Congrats!

#18 R Botero

R Botero

    Apollo

  • -----
  • Posts: 1291
  • Joined: 02 Jan 2009
  • Loc: Kent, England

Posted 09 May 2013 - 02:19 PM

Great result Terra! Congratulations! :jump:

Roberto

#19 starman876

starman876

    Fly Me to the Moon

  • *****
  • Posts: 6313
  • Joined: 28 Apr 2008
  • Loc: VA

Posted 09 May 2013 - 02:23 PM

now it is time for a shootout

And on tonights card is Mr. Unitron and Mr. Jeager.

Protect yourselves at all times and may the best lens win.

Get ready to rumble

#20 bremms

bremms

    Mercury-Atlas

  • *****
  • Posts: 2766
  • Joined: 31 Aug 2012
  • Loc: SC

Posted 09 May 2013 - 02:38 PM

Hope you get to look through it soon. Glad you got it mounted and on the tube. Congrats! Mine is really superb.

#21 greju

greju

    Mercury-Atlas

  • *****
  • Posts: 2903
  • Joined: 13 Oct 2005

Posted 09 May 2013 - 02:49 PM

now it is time for a shootout

And on tonights card is Mr. Unitron and Mr. Jeager.

Protect yourselves at all times and may the best lens win.

Get ready to rumble


Nice looking scope Ms. Clarke. :bow:

After Mr. Jaeger (correct spelling I believe?) wins that shootout a proper match with Mr. Royal Astro might be appropriate. ;)

#22 dgreyson

dgreyson

    Viking 1

  • *****
  • Posts: 805
  • Joined: 06 Nov 2012
  • Loc: South Carolina

Posted 09 May 2013 - 02:50 PM

Good job Terra, that lens cell is A1

#23 Dave M

Dave M

    Cosmos

  • *****
  • Moderators
  • Posts: 8250
  • Joined: 03 Aug 2004
  • Loc: Ohio

Posted 09 May 2013 - 02:51 PM

Excellent work, Terra :waytogo:
I look forward to reading your test results..

#24 starman876

starman876

    Fly Me to the Moon

  • *****
  • Posts: 6313
  • Joined: 28 Apr 2008
  • Loc: VA

Posted 09 May 2013 - 04:02 PM

Don't do it Terra.

Unitron against Jeager. Like my spelling better :lol: :lol:
I have a feeling that someone is really zealous when it comes to Unitrons. :roflmao: :roflmao:

#25 terraclarke

terraclarke

    Fly Me to the Moon

  • *****
  • Posts: 5344
  • Joined: 29 May 2012
  • Loc: The Bluegrass State

Posted 10 May 2013 - 08:48 AM

Thank you all for your nice comments. I do appreciate it.

Terra :flower:






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics