Results 1 to 4 of 4
Like Tree8Likes
  • 4 Post By kanadalainen
  • 3 Post By Gabby76
  • 1 Post By ozeclipse

Thread: Has anyone on AF built a Mirror-o-Matic (M-O-M)?

  1. #1
    kanadalainen's Avatar
    kanadalainen is offline HYPER GIANT
    Points: 28,800, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!First 1000 Experience Points
    Join Date
    Feb 2017
    Location
    Winnipeg
    Posts
    2,941
    Points
    28,800
    Level
    100
    Thanks
    2,941
    Thanked 2,392x 1,050 Posts

    Default Has anyone on AF built a Mirror-o-Matic (M-O-M)?



    Ian
    Scopes Celestron - Vixen 80 f11.3 on a Vixen alt/az mount and an Orion dob XT10i f4.7
    Binoculars Asahi Pentax 7x35 and 7x50, Beck Kassel 8x30 and Celestron 15x70 Camera Nikon D90 with Rokinon 10mm
    Eyepieces: Leitz Periplan GF, ES68s, ES82s, TV Naglers, Meade 4000 super plossl, Nikon CFI, Olympus FK, Paracorr I, Abbe Orthos: Carl Zeiss Jena K7x (35mm), K10x (25mm)
    M110: 110 Herschel 400: 90 Comets: 2 Planets: 6

  2. The Following User Says Thank You to kanadalainen For This Useful Post:

    Gabby76 (03-18-2019)

  3. #2
    kanadalainen's Avatar
    kanadalainen is offline HYPER GIANT
    Points: 28,800, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!First 1000 Experience Points
    Join Date
    Feb 2017
    Location
    Winnipeg
    Posts
    2,941
    Points
    28,800
    Level
    100
    Thanks
    2,941
    Thanked 2,392x 1,050 Posts

    Default Re: Has anyone on AF built a Mirror-o-Matic (M-O-M)?

    It honestly doesn't look too difficult. The more I look at this the more I am convincing myself that its doable. But I'm overly optimistic!!
    Ian
    Scopes Celestron - Vixen 80 f11.3 on a Vixen alt/az mount and an Orion dob XT10i f4.7
    Binoculars Asahi Pentax 7x35 and 7x50, Beck Kassel 8x30 and Celestron 15x70 Camera Nikon D90 with Rokinon 10mm
    Eyepieces: Leitz Periplan GF, ES68s, ES82s, TV Naglers, Meade 4000 super plossl, Nikon CFI, Olympus FK, Paracorr I, Abbe Orthos: Carl Zeiss Jena K7x (35mm), K10x (25mm)
    M110: 110 Herschel 400: 90 Comets: 2 Planets: 6

  4. #3
    Gabby76's Avatar
    Gabby76 is online now Super Moderator
    Points: 81,038, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.8%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Awards:
    Activity & Post & Thread Master
    Join Date
    Jan 2016
    Location
    Live: Slovakia Work: Canada
    Posts
    18,761
    Points
    81,038
    Level
    100
    Thanks
    3,597
    Thanked 5,891x 4,941 Posts
    Blog Entries
    4

    Default Re: Has anyone on AF built a Mirror-o-Matic (M-O-M)?

    As the saying goes, never let fear or common sense hold you back!! What is the worst that could happen

    It does look like an interesting project though.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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

    The weakest link in the optical chain is the large nut located directly behind the
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    / camera. - Gabrielle

    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

  5. #4
    ozeclipse's Avatar
    ozeclipse is offline SUPER GIANT
    Points: 9,223, Level: 66
    Level completed: 58%, Points required for next Level: 127
    Overall activity: 8.0%
    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
    615
    Points
    9,223
    Level
    66
    Thanks
    322
    Thanked 393x 226 Posts

    Default Re: Has anyone on AF built a Mirror-o-Matic (M-O-M)?

    Ian

    I haven't built one but I have used something similar.

    In this post in Astronomy reports,
    Last Friday night - simple pleasures
    I discussed the making of a mirror 40 years ago. I ground the mirror by hand. My mentor had a machine to do polishing. Most of the 150-200 hrs I spent polishing the turned down edge on the mirror was spent on this machine. Unless you are building a huge deep mirror, each grit of grinding doesn't take too long. You will spend a lot of time stripping and cleaning the machine after each grit and probably won't save much time.

    However, you spend a lot of time polishing on the same polishing compound so it's much more useful to have one to do polishing than grinding. I would not recommend you use one machine to do both. Our machine had a frame on top we called the alligator due to its shape. There were two orthogonal cams driving the alligator. One cam controlled stroke length, the other the lateral width of the strokes. If you just whack a mirror on there and let it rip, you will polish concentric rings into the mirror. I needed to frequently change the lateral and longitudinal strokes to randomise the polishing. Final figuring was done by hand. I also needed to constantly monitor the process and adding water and cerium oxide polishing compound in case it dried out. If it dries too much mirror and tool seize together and the force of the machine can take a seashell shaped chunk out of the surface.

    This methodology worked for us and produced the mirror described in the report linked above and that same mirror used in the Takahashi vs Newtonian comparison I posted.

    If you want to make the machine to make one mirror, I'd say forget it. You really need to be doing many mirrors to make it worthwhile constructing such a machine.

    You also need to enclose it in a small but reasonably clean dust free room.

    Best of luck

    Joe
    Last edited by ozeclipse; 03-19-2019 at 10:45 AM.
    kanadalainen likes this.
    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. The Following User Says Thank You to ozeclipse For This Useful Post:

    kanadalainen (03-19-2019)

 

 

Similar Threads

  1. I built a light box too
    By Phil Light in forum Astro Imaging Forum
    Replies: 80
    Last Post: 08-06-2016, 02:24 AM
  2. Little box I built for my ETX-90
    By Jimi in forum ETX Telescope Forum
    Replies: 25
    Last Post: 11-05-2012, 09:46 AM
  3. MY JTW Ultimate is being built...
    By Phil Leigh in forum Astronomy Digital Cameras Forum
    Replies: 2
    Last Post: 10-05-2012, 03:12 PM
  4. Mirror-o-matic!
    By paulcookeastronomy in forum ATM DIY Telescope Making Forum
    Replies: 1
    Last Post: 03-04-2011, 06:34 AM
  5. Anyone built an observatory?
    By Too_Many_Tools in forum Amateur Astronomy Forum
    Replies: 14
    Last Post: 07-11-2009, 07:47 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 12:14 AM.