Printing an 8" Telescope

Discussion in 'Show off' started by Greg Holloway, Nov 4, 2016.

  1. Greg Holloway

    Greg Holloway Administrator
    Staff Member

    Joined:
    Sep 4, 2015
    Messages:
    565
    Likes Received:
    397
    telescope.jpg

    For the last year I have been working on a telescope. It's not entirely printed but most of it is, including the two gearboxes.

    I have been spurred on by a thread from @mike01hu who is also building a telescope | https://forum.e3d-online.com/index.php?threads/carbon-fibre-filament-job-update.1443/

    If you came to TCT you may have spotted the lower half on display. There's also a short feature on James Butons (XRobots) TCT youtube video |
    (skip to 10:40).

    2016-09-16 10.15.51.jpg

    The scope is built around an 8" f4 primary mirror. I made the decision early on that I wanted to use it solely for astrophotography so there is no secondary mirror. There is a camera CCD at the 800mm focal point. It is the exact same camera that the Raspberry Pi uses except it is a much smaller package. This help keep the lightpath clear.

    I have been printing parts over the past few months and things are starting to come together!

    2016-08-27 14.58.17.jpg
    2016-08-17 10.47.19.jpg
    2016-09-19 11.32.06.jpg

    There are a few very large prints in there, some have taken over three days. There are still some complex parts to print including the DEC gearbox.

    2016-09-20 17.08.57.jpg

    2016-08-17 17.05.18.jpg

    I'll try and keep the thread alive with updates. I hope to write an in depth article on Instructables once shes all built and working. Watch this space!....
     
    Colin, Spoon Unit, mike01hu and 3 others like this.
  2. mike01hu

    mike01hu Well-Known Member

    Joined:
    Apr 22, 2014
    Messages:
    957
    Likes Received:
    166
    I remember your early drawing and the finished result is superb. On your next iteration, consider converting to an equatorial mount by the addition of a wedge so that you don't get field rotation on long exposures. A wedge is an easy make but you will need counterbalances. I've posted pics of a small one I made for my solar scope but you can see the principle. This was printed in white PLA but no photo of that taken.
    Mini wedge 2.JPG Mini wedge.JPG
     
    R Design likes this.
  3. Greg Holloway

    Greg Holloway Administrator
    Staff Member

    Joined:
    Sep 4, 2015
    Messages:
    565
    Likes Received:
    397
    Way ahead of you there :)

    The base has adjustment in it to angle the forks backwards. It can be locked into place with clamps on the side.

    telescope_tilted.jpg

    2016-11-06 09.38.23.jpg

    I've engraved the side with marks for reference.
     
    Pipshag likes this.
  4. Greg Holloway

    Greg Holloway Administrator
    Staff Member

    Joined:
    Sep 4, 2015
    Messages:
    565
    Likes Received:
    397
    Baffles are in as is the camera focus assembly at the front...

    2016-11-06 13.47.58.jpg

    I think I might put in the primary mirror and see if I can get anything out of it....
     
    mike01hu likes this.
  5. Greg Holloway

    Greg Holloway Administrator
    Staff Member

    Joined:
    Sep 4, 2015
    Messages:
    565
    Likes Received:
    397
    success!

    001.jpg

    sort of...

    that's a lamp across the industrial park. Also looks like there is something on the CCD. Enough sitting in the dark in the workshop for today I think....
     
    mike01hu likes this.
  6. mike01hu

    mike01hu Well-Known Member

    Joined:
    Apr 22, 2014
    Messages:
    957
    Likes Received:
    166
    Even better than expected! What is the tube made from?
     
    Greg Holloway likes this.
  7. Greg Holloway

    Greg Holloway Administrator
    Staff Member

    Joined:
    Sep 4, 2015
    Messages:
    565
    Likes Received:
    397
    Acrylic....
     
  8. Greg Holloway

    Greg Holloway Administrator
    Staff Member

    Joined:
    Sep 4, 2015
    Messages:
    565
    Likes Received:
    397
    Found the bit of fluff on the CCD and cleaned it up.

    2016-11-08 11.20.36.jpg

    You can just make it out in the photo.
     
    mike01hu likes this.
  9. mike01hu

    mike01hu Well-Known Member

    Joined:
    Apr 22, 2014
    Messages:
    957
    Likes Received:
    166
    That's a rope!:D
     
  10. EpicFail

    EpicFail Active Member

    Joined:
    Apr 22, 2016
    Messages:
    38
    Likes Received:
    4
    This is an amazing build.
     
    Greg Holloway likes this.

Share This Page