Results 1 to 5 of 5
Like Tree7Likes
  • 2 Post By RALibby
  • 3 Post By Sparweb
  • 2 Post By ninosr

Thread: Roll Off Roof Mechanism

  1. #1
    RALibby's Avatar
    RALibby is offline SUPER GIANT
    Points: 5,147, Level: 48
    Level completed: 99%, Points required for next Level: 3
    Overall activity: 15.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    May 2016
    Location
    Mars Hill, Maine
    Posts
    604
    Points
    5,147
    Level
    48
    Thanks
    142
    Thanked 100x 85 Posts

    Default Roll Off Roof Mechanism



    Has anyone ever used a direct drive screw type garage door opener to move a roll off roof? I'm looking at a 10x14 obey with ror. Due to my location and needing to design for snow load, the roof will probably be 6 over 12 pitch, metal roof panels over 7/16 osb on 2x4 trusses at 24" centers. Estimates are that the moving roof will weigh between 750 to 800 lbs. If I set it on 5 sets of 2" or 2 1/2" casters riding in steel/aluminum U channels then each caster load is around 80 lbs.

    I don't know if I will be able to move it manually so thinking about using a direct drive opener.

    Suggestions, comments or advice on track systems and moving the roof greatly appreciated.
    Perplexed and Testgear like this.
    Roger
    Scopes: Z12 F4.9 dob, Orion XT10g F4.7 dob, Tasco #7TE-5 60mm F16.7 w/Royal Astro lens on equatorial mount
    EPs: 30mm, ES 82* 18 mm, 14 mm, 11 mm and 8.8 mm, 9 mm Plossel,.965 ep 20mm, 12.5mm, 9mm, 6mm, 3x barlow
    Finder scope: 8x50 RACI, 6x30, Telrad
    Binocs: Nikon 8x35, Bushnell 10x42, Gordon 10x50

  2. #2
    Sparweb's Avatar
    Sparweb is offline Main Sequence
    Points: 4,813, Level: 47
    Level completed: 32%, Points required for next Level: 137
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!365 Days+ Registered Achievement!
    Join Date
    Apr 2015
    Location
    Alberta
    Posts
    193
    Points
    4,813
    Level
    47
    Thanks
    54
    Thanked 69x 56 Posts

    Default Re: Roll Off Roof Mechanism

    Double garage doors can be heavy, but the torsion spring keeps the force to open them down to about 50 pounds, if they're tuned right, but they work if they have to lift more than that.
    The GDO working to lift 100 pounds 9 feet in 10 seconds is only doing about 0.2 HP of mechanical work, so it's no surprise many of them are rated at 1/2 HP. You can get 3/4 HP and 1 HP GDO's if you want.
    I don't see anything wrong with the plan, in principle, as long as you are prepared to make/modify the rails, chain, and attachments.
    Since you always get automatic stop from the infrared light sensors and the up/down force sensors on GDO's, putting those features to use will allow you to make your system safer, too.
    SpyderwerX, Perplexed and RALibby like this.
    -Steven F.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : Lunt Eng. 102mm f/7 ED doublet refractor, mount: Celestron VX, EP: Celestron Luminos, camera: Canon 6D

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  3. The Following User Says Thank You to Sparweb For This Useful Post:

    RALibby (09-18-2018)

  4. #3
    ninosr's Avatar
    ninosr is offline White Dwarf
    Points: 5,730, Level: 51
    Level completed: 90%, Points required for next Level: 20
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!750 Days+ Registered Achievement!2 Posts AchievementFirst 1000 Experience Points1000 Days+ Registered Achievement!
    Join Date
    Sep 2011
    Location
    South Dakota
    Posts
    9
    Points
    5,730
    Level
    51
    Thanks
    1
    Thanked 6x 5 Posts

    Default Re: Roll Off Roof Mechanism

    I dont know if you have checked out this link yet from SkyShed. http://www.skyshed.com/Motorizationo...hedRollOff.pdf. This is what I plan to do to my roll off roof.

    Nino

  5. #4
    ozeclipse's Avatar
    ozeclipse is offline SUPER GIANT
    Points: 9,647, Level: 67
    Level completed: 99%, Points required for next Level: 3
    Overall activity: 0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!2 Posts Achievement
    Join Date
    Jan 2014
    Location
    Canberra, AUSTRALIA, 35 S, 149 E
    Posts
    620
    Points
    9,647
    Level
    67
    Thanks
    323
    Thanked 395x 226 Posts

    Default Re: Roll Off Roof Mechanism

    I am designing a 6x6m (20x20ft) observatory. No snow loading issues fortunately but the low angle gable roof will still weigh a lot. I have been wondering about the same thing. It's a remote site and I'll only have limited solar charged 12v or 24v battery power.

    The way I thought about it is as follows :-

    When I have received new scientific equipment [mass spectrometers] for my research lab, some of the boxes weighed almost as much as your observatory roof. Nonetheless, I could move the boxes easily over a level vinyl covered concrete floor surface with a pallet jack running on 4 hard rollers, two with 5" diameter, two with 2" diameter.

    Moving anything heavy on rollers is a matter of overcoming the initial inertia. Once moving, it's easy to keep it moving. Make sure you have a good handle that you can put your weight into without straining your back. Once moving, it shouldn't be too hard to move. Make sure you use good quality steel rollers on steel track.

    In deciding whether you want to motorise or not, think about your age and physical condition now, and at the end of the observatory's useful life when you will stop using it?

    A friend of mine at NEAF was talking to someone about motorising his ROR as an integral part of having a remote automated observatory. The person at NEAF suggested a garage door opener as they already have features like remote control, soft start/ soft stop. etc.

    cheers

    Joe
    40 years in amateur astronomy - 1978-2018
    Astronomical interests : astrophotography, visual observing, night-scapes, solar eclipse chasing, asteroidal occultations
    Bortle 1-2 skies, 149 E, 35 S
    web site : http://joe-cali.com/astronomy
    SCOPES - ATM 18" Dob, Vixen VC200L, ATM 6"f7, ED80
    CAMERAS : Pentax K1, K5, K01 / VIDEO CAMS : TacosBD, Lihmsec

  6. #5
    ninosr's Avatar
    ninosr is offline White Dwarf
    Points: 5,730, Level: 51
    Level completed: 90%, Points required for next Level: 20
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!750 Days+ Registered Achievement!2 Posts AchievementFirst 1000 Experience Points1000 Days+ Registered Achievement!
    Join Date
    Sep 2011
    Location
    South Dakota
    Posts
    9
    Points
    5,730
    Level
    51
    Thanks
    1
    Thanked 6x 5 Posts

    Default Re: Roll Off Roof Mechanism

    I installed a Genie Screwtype garage door opener to open and close my observatory roof, I used the PDF information that was listed on the pdf link. I was pretty straight forward. The good thing about this garage door opener are the limit switches, which can be positioned for proper roof opening and closing. Here is a short video of my roof opener in action.
    sdbodin and Gabby76 like this.

 

 

Similar Threads

  1. roll-off roof design help
    By cheymccoy73 in forum Home Observatory Forums
    Replies: 11
    Last Post: 04-26-2014, 03:20 AM
  2. Small roll off shed (not roll off roof)
    By dynamo in forum Home Observatory Forums
    Replies: 27
    Last Post: 10-17-2013, 12:51 PM
  3. Roll off roof observatory.
    By geinman in forum Home Observatory Forums
    Replies: 10
    Last Post: 05-16-2011, 10:37 AM
  4. 2 tons roll of roof
    By Mats in forum ATM DIY Telescope Making Forum
    Replies: 10
    Last Post: 08-07-2010, 12:22 AM
  5. 2 tons roll of roof
    By Mats in forum Home Observatory Forums
    Replies: 14
    Last Post: 11-22-2009, 02:25 PM

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 04:48 AM.