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Thread: Compur shutter questions

  1. #31

    Join Date
    Aug 2018
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    Re: Compur shutter questions

    Quote Originally Posted by David Lindquist View Post
    If you go to this reference: http://www.tontrennung.de/assets/doc...ur_shutter.pdf

    Scroll down a bit to "Section 2 Specifications" then scroll a bit more to the specifications for the rimset No. 2 Compur you can see the mounting thread is described as having a pitch of 29 1/13 threads per inch (T.P.I.) with the angle of the threads being 50. Then just a bit further the No. 3 and No. 4 Compound shutters are described as having the same 29 1/13 threads per inch pitch with an angle of 50. The SK Grimes website describes these shutters as having a mounting thread pitch of 0.9 mm.

    Doing the arithmetic 29 1/13 threads per inch works out to be a metric pitch of 0.874 mm which does round off to 0.9 mm.

    Incidentally I have a circa mid-1960's Schneider brochure on their Componon and Comparon enlarging lenses. It shows the 180, 210, and 240 mm Componons and the 210 and 300 mm Comparons as having a mounting thread with the 29 1/13 threads per inch pitch (thread angle not given.)

    David
    The 29"1/13 tpi might be a joke.
    According to my understanding of imperial engineering units the 1/13 could have been substituted with ,077 or 5/64.

    How do you differentiate between m0.9 and m0.87 when you have 3 threads?

    Sent fra min SM-G975F via Tapatalk

  2. #32
    (Shrek)
    Join Date
    Mar 2011
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    Montreal
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    1,956

    Re: Compur shutter questions

    Quote Originally Posted by Oslolens View Post

    How do you differentiate between m0.9 and m0.87 when you have 3 threads?
    I personally don't, you would need some very expensive gear to measure that and for our purposes it's irrelevant. I would cut those threads at 28 tpi and call it a day. It will fit just fine.

  3. #33

    Join Date
    Jan 2019
    Posts
    537

    Compur shutter questions

    If you know the size you can also get it from Luland.

    https://www.ebay.com/itm/Luland-Larg...-127632-2357-0

    https://www.ebay.com/itm/Luland-Larg...-127632-2357-0

    They carry all sizes and do custom too.

    I buy A LOT from them and its always perfect. Usually I get it in 10 days.

  4. #34

    Re: Compur shutter questions

    [QUOTE=Kiwi7475;1624653]If you know the size you can also get it from Luland.

    My understanding is that Luland retaining rings are for Compur rim set shutters, not the older dial set shutters which have different dimensions.


    Sent from my iPhone using Tapatalk Pro

  5. #35

    Join Date
    Jan 2019
    Posts
    537

    Re: Compur shutter questions

    Like I said, if you know the dimensions they can do a custom size.

  6. #36
    Ron (Netherlands)'s Avatar
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    Nov 2011
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    Re: Compur shutter questions

    Quote Originally Posted by David Lindquist View Post
    If you go to this reference: http://www.tontrennung.de/assets/doc...ur_shutter.pdf

    Scroll down a bit to "Section 2 Specifications" then scroll a bit more to the specifications for the rimset No. 2 Compur you can see the mounting thread is described as having a pitch of 29 1/13 threads per inch (T.P.I.) with the angle of the threads being 50. Then just a bit further the No. 3 and No. 4 Compound shutters are described as having the same 29 1/13 threads per inch pitch with an angle of 50. The SK Grimes website describes these shutters as having a mounting thread pitch of 0.9 mm.

    Doing the arithmetic 29 1/13 threads per inch works out to be a metric pitch of 0.874 mm which does round off to 0.9 mm.

    Incidentally I have a circa mid-1960's Schneider brochure on their Componon and Comparon enlarging lenses. It shows the 180, 210, and 240 mm Componons and the 210 and 300 mm Comparons as having a mounting thread with the 29 1/13 threads per inch pitch (thread angle not given.)

    David
    Thanks David for the link (which I should have known). Let's hope then for the OP that the modern rim-set shutter has the same dimensions as the old dial set Compur.

    <edit> I have one rimset n.2 and it is compatible (the one with the Zeiss Ikon logo)...

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  7. #37

    Join Date
    Jul 2006
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    Re: Compur shutter questions

    [QUOTE=PunkFunkDunk;1624721]
    Quote Originally Posted by Kiwi7475 View Post
    If you know the size you can also get it from Luland.

    My understanding is that Luland retaining rings are for Compur rim set shutters, not the older dial set shutters which have different dimensions.


    Sent from my iPhone using Tapatalk Pro
    I think you are on the right track getting a retaining ring from Phototools. Please let us know how it works out. (I gather they are more accessible to you than SK Grimes here in the US)

    I did get one of the Luland's tripod heads, one based on the Ries/Baco design. I think it is quite nicely made.

    David

  8. #38

    Join Date
    Jul 2006
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    Central Mother Lode, California
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    523

    Re: Compur shutter questions

    Quote Originally Posted by Ron (Netherlands) View Post
    Thanks David for the link (which I should have known). Let's hope then for the OP that the modern rim-set shutter has the same dimensions as the old dial set Compur.

    <edit> I have one rimset n.2 and it is compatible (the one with the Zeiss Ikon logo)...

    Lovely collection of Compound and (mostly) dial-set Compur shutters!

    To be clear for everyone I have two flanges from SK Grimes that would have a pitch of 0.9 mm, one for one of my dial-set Compurs and one for my (pre WWII) No. 4 Compound. Both fit nicely which is not surprising all things considered.

    May as well note for everyone that the No. 3 Compur did not follow the dimensions of the No. 3 Compound; both its lens cell threads and its mounting thread are metric pitch (and presumably form).

    David

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