Page 1 of 2 12 LastLast
Results 1 to 10 of 18
Like Tree15Likes

Thread: Flocking the Dob

  1. #1
    Raymondhow's Avatar
    Raymondhow is offline Gold Supporter
    Points: 34,727, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 10.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Mar 2014
    Location
    Oakland, California
    Posts
    4,749
    Points
    34,727
    Level
    100
    Thanks
    881
    Thanked 2,101x 1,290 Posts

    Default Flocking the Dob



    So it took me days of messing around and multiple trips to the hardware store, but I'm finally done and pretty happy with the results. If the sky will ever cooperate, I'll get up to the roof and hopefully see the improvement. So here are various notes...

    The flockboard from Protostar is substantial stuff, plastic sheeting 0.040" thick. The kit consisted of two pre-cut pieces, one somewhat larger than the other. Together they weigh about 35 oz, just over 2 pounds. So my OTA has gained about 10% in weight, just enough to be noticable.

    Getting the tube disassembed was easy enough, and getting the flockboard in was a snap. That part had to be easier than unrolling adhesive flocking paper. After installing the bottom portion, I drilled holes for screws and reinstalled the altitude bearings.

    Up to that point, was more or less following the instruction sheet:
    http://www.fpi-protostar.com/ftp/fbgsotips.pdf
    The instructions are more or less complete, but have a serious problem with reassembly order. Says to reinstall the mirror cell before putting in the top portion of flockboard. I shudder to think of my mirror in place while I'm drilling holes at the top and cutting the focuser hole, getting bits of plastic all over. No, reinstalling the mirror cell was the very last thing to do.

    Cutting the hole for the focuser was more difficult than expected, broke my cheap utility blade. I finished trimming with an Exacto knife. For the various holes for bolts and such, I used a drill which worked well enough, of course left little bits of flockboard on my kitchen floor. For the cutting, I did wear safety goggles. Probably should've been wearing for the drilling too, oh well.

    My focuser had no washers behind the tiny inside nuts. That works okay with the plain metal tube, but with the flockboard I wanted to use washers. So off to hardware store for washers, and a new utility knife. Then had another problem. The screws were not long enough anymore, due to the flockboard thickness along with the washers. The nuts couldn't be screwed on all the way. So, back to the hardware store for longer screws. I could only find some with flat heads, but they worked well enough.

    The finder mount has a brace inside the tube. Wasn't sure whether to place that behind the flocking, or just leave the gray metal exposed. Then had another idea. The kit came strapped together using a narrow strip of flockboard. I used a piece of the strip (superglued in place) to cover the brace plate.

    More fun in part 2...

    Ray
    Attached Images Attached Images
    Raymond Howard
    Outreach Coordinator, Eastbay Astronomical Society
    Master Observer #204, Astronomical League

    12.5" f/6 custom Dob by New Moon Telescopes, Orion XT8 f/6 "ruby-red" Dob. Finders 13x80 Stellarvue RACI, 9x50 Orion RACI. Eyepieces 34mm Explore Scientific 68°, 24mm ES 68°, 16mm ES 68°, 10mm TeleVue Delos 72°, 7mm TeleVue DeLite 62°.

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

  2. #2
    Raymondhow's Avatar
    Raymondhow is offline Gold Supporter
    Points: 34,727, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 10.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Mar 2014
    Location
    Oakland, California
    Posts
    4,749
    Points
    34,727
    Level
    100
    Thanks
    881
    Thanked 2,101x 1,290 Posts

    Default Re: Flocking the Dob

    One part of the instructions I probably should've followed, but didn't. Says to "Align the overlap seam with the focuser hole". I started to do that, but realized it would require cutting separate holes for the focuser in both ends of the overlap. Instead, I turned the overlap seam somewhat away from the focuser, so was able to cut just a single hole. But then, the overlapping edges of the top piece did not stay flush with the tube. So I bought some double-sided permanent mounting tape, applied to the backside of the overlap at top and bottom, and pressed it into place. Seems to work, hope it doesn't come loose.

    To give my secondary a wash, I filled a small bowl with distilled water and some dish liquid. Holding the spider assembly, I dipped the front of the secondary, only far enough so the backside would not get wet. Held it in that position for about a minute. Then lightly daubed with sopping cotton ball. Rinsed the front with clean distilled water poured straight from the bottle. Used blower bulb to chase droplets away. My method required no removal of the secondary from the spider, and seemed to work well so I would recommend it

    Next, I flocked the edge of the secondary that faces the focuser. On the Cloudynights page linked by Alan, I found this graph posted last year by someone named Jason. I used the graph to make a paper template. Minor axis of my secondary is 47 mm, so R = 23.5mm. When I printed out his graph at 58% scale, it closely matched my secondary size. I had a flocking paper sample from Scopestuff, cut it to the same curve as the paper strip. Removed the adhesive backing and carefully applied to the mirror edge, making sure not to get adhesive on the reflective surface. Wasn't perfect, but a pretty close fit.

    Before reinstalling the optics, I vacuumed out the tube with a brush attachment to get rid of assorted flotsam. Spider and mirror cell back in with no problems, didn't need to readjust the secondary at all. Collimation was a snap, only a little bit off.

    Now if only skies will clear again...

    Ray
    Attached Images Attached Images
    Last edited by Raymondhow; 09-21-2014 at 02:35 AM.
    Lowjiber, jgroub, Gerry1 and 1 others like this.
    Raymond Howard
    Outreach Coordinator, Eastbay Astronomical Society
    Master Observer #204, Astronomical League

    12.5" f/6 custom Dob by New Moon Telescopes, Orion XT8 f/6 "ruby-red" Dob. Finders 13x80 Stellarvue RACI, 9x50 Orion RACI. Eyepieces 34mm Explore Scientific 68°, 24mm ES 68°, 16mm ES 68°, 10mm TeleVue Delos 72°, 7mm TeleVue DeLite 62°.

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

  3. #3
    Gregg1956's Avatar
    Gregg1956 is offline SUPER GIANT
    Points: 5,530, Level: 50
    Level completed: 90%, Points required for next Level: 20
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Feb 2014
    Location
    Mojave Desert, California
    Posts
    624
    Points
    5,530
    Level
    50
    Thanks
    85
    Thanked 146x 117 Posts

    Default Re: Flocking the Dob

    I'm impressed Ray. Well done on both the project and this step-by-step how-to post. I'm sure this will help people who want to flock their dobs. (I wouldn't dare try this myself. I'm not a DIY kind of guy.)

    On behalf of potential dob flockers I salute you!

    Gregg
    jgroub likes this.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : AD8 Dob w/Halo and mounted GLP finder, Celestron Powerseeker 70AZ,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    StarBlast 90mm refractor
    EP's: 2" 30mm 68°, 1.25" Plossl 9mm 52°, GSO SuperView 15mm 68°, Agena EWA 6mm 66°, Agena UWA 25mm 58°, GSO 2x/1.5x
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Misc:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    filter, UHC/LPR filter
    Sky's The Limit Observatory
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  4. #4
    KT4HX's Avatar
    KT4HX is offline HYPER GIANT
    Points: 102,795, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!1000 Days+ Registered Achievement!200+ Posts Achievement!
    Join Date
    Dec 2008
    Location
    Virginia
    Posts
    11,786
    Points
    102,795
    Level
    100
    Thanks
    1,443
    Thanked 8,098x 4,361 Posts
    Blog Entries
    200

    Default Re: Flocking the Dob

    Good job Ray. For those considering doing this, once you have the secondary spider re-installed, measure from the center of center bolt at the back of the secondary holder along each spider vane to where it meets the interior wall of the OTA. You want them all equal so the secondary is well centered in relation to the OTA's interior wall. If you are off a mm or two that's ok, you just don't want any gross errors.

    Glad the template for the secondary edge flocking worked well for you.
    Alan || My DSO Blog:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    ---------------------------------------------------------------------------
    Astro Sky 17.5 f/4.5 Dob ||
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    f/5 Dob || Zhumell Z10 f/4.9 Dob
    ES AR127 f/6.5 and ES ED80 f/6 on Twilight-II Mount
    ES 82° 24mm, 18mm; Pentax XW 10mm, 7mm, 5mm
    ---------------------------------------------------------------------------
    Astronomers: We look into the past to see our future.

  5. #5
    Lowjiber's Avatar
    Lowjiber is offline Urban Astronomer
    Points: 212,300, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Awards:
    Highest Experience Award
    Join Date
    Jun 2013
    Location
    Las Vegas, Nv, about two miles south of the "strip".
    Posts
    12,251
    Points
    212,300
    Level
    100
    Thanks
    4,205
    Thanked 4,522x 3,540 Posts
    Blog Entries
    6

    Default Re: Flocking the Dob

    That's really a nice, well-documented report, Ray.

    Hopefully, you'll get early clear skies to give us the comparison report.

    Clear Skies
    John (Urban Astronomer)
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Dob; XLT 150 Dob; XLT 120EQ; Lunt Solar 60 PT/B1200; ES AR102; SW Pro 100ED; 2 SW Pro 80ED's; 90mm Eq; WO Z-61; SW 90mm Virtuso Mak; 2
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST-80's; Quark-C; Cams: ASI120MM-S, ASI174MM & ASI174MM-cooled


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

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

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

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

  6. #6
    Raymondhow's Avatar
    Raymondhow is offline Gold Supporter
    Points: 34,727, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 10.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Mar 2014
    Location
    Oakland, California
    Posts
    4,749
    Points
    34,727
    Level
    100
    Thanks
    881
    Thanked 2,101x 1,290 Posts

    Default Re: Flocking the Dob

    Thanks guys. Alan, I hadn't measured from spider center but did just now, found it spot on. I had turned the knobs so same number of threads were exposed on each, as was the case before disassembling.

    I still want to flock the inside of the focuser. From Protostar, I'm planning to order a small piece of the 0.020" flockboard, which should do the trick. Also want another piece of the regular 0.040" flockboard to make a light shield. I just sent them an e-mail to tell them why the instruction sheet needs some work

    Ray
    Raymond Howard
    Outreach Coordinator, Eastbay Astronomical Society
    Master Observer #204, Astronomical League

    12.5" f/6 custom Dob by New Moon Telescopes, Orion XT8 f/6 "ruby-red" Dob. Finders 13x80 Stellarvue RACI, 9x50 Orion RACI. Eyepieces 34mm Explore Scientific 68°, 24mm ES 68°, 16mm ES 68°, 10mm TeleVue Delos 72°, 7mm TeleVue DeLite 62°.

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

  7. #7
    Heavenly Gazer's Avatar
    Heavenly Gazer is offline Banned
    Points: 8,234, Level: 63
    Level completed: 28%, Points required for next Level: 216
    Overall activity: 0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Mar 2014
    Location
    SE Missouri
    Posts
    1,462
    Points
    8,234
    Level
    63
    Thanks
    163
    Thanked 261x 202 Posts

    Default Re: Flocking the Dob

    Raymond this is a great report, however I was a little worried at the title of this post when I first laid eyes on it...

    Did the material just unfold inside the OTA and stay in position by itself or did you glue it in place? thx

  8. #8
    Raymondhow's Avatar
    Raymondhow is offline Gold Supporter
    Points: 34,727, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 10.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Mar 2014
    Location
    Oakland, California
    Posts
    4,749
    Points
    34,727
    Level
    100
    Thanks
    881
    Thanked 2,101x 1,290 Posts

    Default Re: Flocking the Dob

    Thanks Rick. The flockboard mostly stayed in position after unrolling, although the top portion overlap needed a little help from two strips of double-sided mounting tape. I considered glue, but would have been difficult to apply and potentially messy.

    Ray
    Heavenly Gazer likes this.
    Raymond Howard
    Outreach Coordinator, Eastbay Astronomical Society
    Master Observer #204, Astronomical League

    12.5" f/6 custom Dob by New Moon Telescopes, Orion XT8 f/6 "ruby-red" Dob. Finders 13x80 Stellarvue RACI, 9x50 Orion RACI. Eyepieces 34mm Explore Scientific 68°, 24mm ES 68°, 16mm ES 68°, 10mm TeleVue Delos 72°, 7mm TeleVue DeLite 62°.

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

  9. #9
    Hilbily's Avatar
    Hilbily is offline SUPER GIANT
    Points: 5,839, Level: 52
    Level completed: 45%, Points required for next Level: 111
    Overall activity: 1.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Jun 2014
    Location
    SW VA
    Posts
    696
    Points
    5,839
    Level
    52
    Thanks
    41
    Thanked 143x 136 Posts

    Default Re: Flocking the Dob

    Great tutorial Ray!
    Mike
    XT8G, ES 16”, 10"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , TSA120, C80ED, & SkyScanner
    ES 82° 30mm - 4.7mm, APM 18 & 24
    APM 100, PCF WP II 10x50 & 20x60, 15x70 Ultra, 7x35 Kmart, CEM60, Twilight I

  10. #10
    jgroub's Avatar
    jgroub is offline Banned
    Points: 3,884, Level: 41
    Level completed: 56%, Points required for next Level: 66
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!
    Join Date
    Jul 2014
    Location
    New York, NY
    Posts
    575
    Points
    3,884
    Level
    41
    Thanks
    262
    Thanked 96x 80 Posts

    Default Re: Flocking the Dob

    Ray, very nicely done! I was wondering, though; from your description it looks like you got the flockboard kit for an 8" reflector, right? As opposed to the "Hi-Tack flocked light trap"? What made you choose one over the other? It seems like the "light trap" stuff is even darker than the one you got, but what do I know.

    And when are we going to get that compare and contrast report on before/after contrast? I'm dying for it over here! (Yeah, I guess my life is exactly that pathetic.)

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. flocking ?
    By rory in forum Astronomy Beginners Forum
    Replies: 8
    Last Post: 05-11-2012, 03:50 PM
  2. Flocking
    By neal_mlc in forum Dobsonian Telescopes Forum
    Replies: 9
    Last Post: 04-18-2012, 04:11 PM
  3. flocking an XT8, how?
    By dokelly07 in forum Dobsonian Telescopes Forum
    Replies: 8
    Last Post: 02-13-2010, 01:05 AM
  4. Flock the Flocking Flockables ... or ... Flocking Ideas?
    By FatherGuse in forum ATM DIY Telescope Making Forum
    Replies: 4
    Last Post: 09-19-2009, 08:50 PM
  5. Flocking
    By Jonsey in forum Reflector Telescope Forum
    Replies: 0
    Last Post: 02-09-2009, 04:39 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 12:56 AM.