Results 1 to 9 of 9
  1. #1
    Jim's Avatar
    Jim Guest

    Default Newtonian tube rings



    I was wondering if there are tube rings that allow you to rotate a
    Newt without having to slacken the rings first? Anyone know of such
    a cradle?

    Jim
    --
    jim@magrathea.plus.com -*- GreyArea@mac.com
    "We deal in the moral equivalent of black holes, where the normal
    laws of right and wrong break down; beyond those metaphysical
    event horizons there exist ... special circumstances" - Use Of Weapons

  2. #2
    Jim's Avatar
    Jim Guest

    Default Newtonian tube rings

    Jim <jim@odin.magrathea.local> wrote:


    Never mind - a five minute search on Google (which I wasn't able to do
    at the time) reveals there *are* such things - and boy, do they cost!

    Jim
    --
    jim@magrathea.plus.com AIM/iSight:JCAndrew2 - Log in and say 'hi'
    "We deal in the moral equivalent of black holes, where the normal
    laws of right and wrong break down; beyond those metaphysical
    event horizons there exist ... special circumstances" - Use Of Weapons

  3. #3
    Richard @'s Avatar
    Richard @ Guest

    Default Newtonian tube rings

    > > I was wondering if there are tube rings that allow you to rotate a

    I actually bought some giant jubilee (hose) clips and rigged them on to the
    mount using some sculpted pieces of mahogany as a brace. (I had the problem
    of a short tube fixed to the mount by two screws, no rings. This meant that
    after polar alignment, the scope was virtually impossible to use in the
    southern skys.)

    Works very well. The hose clips only cost about 4 UKP from B&Q. Mahogany was
    free!!!!

    Richard




  4. #4
    Paul A Brierley's Avatar
    Paul A Brierley Guest

    Default Newtonian tube rings

    Yes there are such things. If I can remember they have small ball
    barings fitted inside the rings. They used to advertise Rotating Tube
    Rings in S&T many years ago and I don't if you can still buy them. If
    there are any ATMs reading this post perhaps they are better
    qualified to answer that question. What I do know is, there not cheap.


    Rgs.
    PaulB.

    On Thu, 5 Feb 2004 11:20:39 +0000, Jim <jim@odin.magrathea.local>
    wrote:



  5. #5
    Stephen Tonkin's Avatar
    Stephen Tonkin Guest

    Default Newtonian tube rings

    Jim <jim@magrathea.plus.com> wrote:

    Not if you get them from a haberdashery shop. Ask for embroidery rings.
    The outer is the one that you want, in a size that fits your scope.

    Best,
    Stephen

    Remove footfrommouth to reply

    --
    + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
    + Stephen Tonkin | ATM Resources; Astro-Tutorials; Astro Books +
    + (N51.162 E0.995) | <http://astunit.com> +
    + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

  6. #6
    Steve Taylor's Avatar
    Steve Taylor Guest

    Default Newtonian tube rings

    Jim wrote:
    What internal diameter would you need ?

    Steve


  7. #7
    MikeB's Avatar
    MikeB Guest

    Default Newtonian tube rings


    "Jim" <jim@magrathea.plus.com> wrote in message
    news:1g8p633.wfy1p9d2fhjmN%jim@magrathea.plus.com. ..

    Years ago when I was first interested in buying a telescope (6 or 8 inch
    Newt) they all seemed to come with "slip rings" which were just another ring
    that clamped onto the tube above the topmost ring, but did not attach to the
    mount. This stopped the tube slipping back and upsetting the balance when
    the mount rings were slackened to rotate the tube, cheap and they worked.
    However I have not seen this simple addition on any of the telescopes that I
    am now considering, having taken up the interest again. I assume that just
    a spare mount ring will do the job, if necessary with the attaching bit
    filed off.

    MikeB.



  8. #8
    Chris.B's Avatar
    Chris.B Guest

    Default Newtonian tube rings

    jim@magrathea.plus.com (Jim) wrote:


    Don't panic Jim.;-)

    Why don't you place a spacer where the "jaws" of your tube rings
    close?

    A suitable thickness (small diameter) washer over the clamping screw
    could be slipped <between> the jaws as the rings are clamped up.
    Leaving you with just enough freedom to rotate your tube. You'd have
    to obtain a spare tube ring to clamp normally to your tube above the
    top 'slip' ring. To stop the whole OTA from sliding South through the
    (now looser) rings. Be careful that your washers/spacers are small
    enough not to scratch the OTA directly.

    Hey presto!: Slip rings for the price of a singe cheap ordinary tube
    ring.
    I'd examine the quality of your ring lining felt as well though.
    Perhaps line them with some quality felt to avoid damaging the
    paintwork of your OTA. Some of this 'felt' is more like flock than the
    real article.

    Enjoy? :-)

    Chris.B

  9. #9
    Jim's Avatar
    Jim Guest

    Default Newtonian tube rings

    Jim <jim@odin.magrathea.local> wrote:


    (Belated) thanks for all the suggestions. I'm going to put the tube ring
    idea on hold for now (just got a new HEQ5 mount and having fun with
    that) but it's one I'll no doubt return to.

    Once again, thanks guys.

    Jim
    --
    jim@magrathea.plus.com AIM/iSight:JCAndrew2 - Log in and say 'hi'
    "We deal in the moral equivalent of black holes, where the normal
    laws of right and wrong break down; beyond those metaphysical
    event horizons there exist ... special circumstances" - Use Of Weapons

 

 

Similar Threads

  1. Tube rings for the powerseeker 114AZ
    By Lupis in forum Astronomy Beginners Forum
    Replies: 1
    Last Post: 07-18-2010, 04:36 AM
  2. Tube rings for a C9.25 sct
    By saturn1970 in forum ATM DIY Telescope Making Forum
    Replies: 1
    Last Post: 03-10-2010, 06:38 PM
  3. 5" Tube rings needed
    By Ian Sharp in forum UK Astronomy Forum
    Replies: 7
    Last Post: 08-30-2005, 07:20 AM
  4. Newtonian tube drama
    By Rockett Crawford in forum Amateur Astronomy Forum
    Replies: 27
    Last Post: 04-05-2005, 02:55 PM
  5. Fiberglass tube for Large Newtonian?
    By Don Bruns in forum Amateur Astronomy Forum
    Replies: 27
    Last Post: 05-13-2004, 07:39 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 09:36 PM.