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Thread: Compound shutter sizes

  1. #1
    All metric sizes to 24x30 Ole Tjugen's Avatar
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    Post Compound shutter sizes

    Since these come up quite often, I'll post what information I have here once and for all.

    All data are taken from the Compur Repair Manual, so they should be correct.

    There were five sizes of Compound shutter (late type, with X-sync):

    Compound 3-X Tube 7
    Compound 4-X Tube 9
    Compound 4-X Tube 10/II
    Compound 5-X Tube 12/I
    Compound 5-X Tube 12/II

    Dimensions are listed as:
    A: Cell thread (all are the same front and rear), all are 40 t.p.i.
    B: Flange thread
    C: Largest aperture diameter
    D: Body diameter
    E: Length
    F: Mount depth (flange to rear end of shutter).

    Data - all dimensions in mm :

    3-7 : A: 55.69 B: 60 x 29 1/13 t.p.i. C: 40 D: 87 E: 37 F: 15.7
    4-9 : A: 62.20 B: 65.9 x 29 1/13 t.p.i. C: 52 D: 106 E: 50 F: 21.8
    4-10/II : A: 67.92 B: 76.7 x 29 1/13 t.p.i. C: 52 D: 106 E: 45 F: 19.3
    5-12/I : A: 82.77 B: M90 x 1mm C: 64.5 D: 125.5 E: 74 F: 33.2
    5-12/II : A: 82.77 B: M90 x 1mm C: 64.5 D: 125.5 E: 60 F: 25.2

    Fastest shutter speeds are: #3: 1/100 #4: 1/75 #5:1/50

  2. #2

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    Re: Compound shutter sizes

    Ole, you best link to this thread in your signature. That way people can always refer to it

  3. #3
    All metric sizes to 24x30 Ole Tjugen's Avatar
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    Re: Compound shutter sizes

    Good idea, Ash.

  4. #4

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    Re: Compound shutter sizes

    Nice idea Ole. Are those thread sizes 'really' t.p.i., or are they metric sizes translated into imperial units?

  5. #5
    All metric sizes to 24x30 Ole Tjugen's Avatar
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    Re: Compound shutter sizes

    Those thread sizes are really t.p.i.

    Those are the data taken directly from the book, and thus from the original specifications. The 29 1/13 tpi is very close to .75mm, which is what SK Grimes use.

    The 40 t.p.i has a 64° pitch, the 29 1/13 t.p.i. has a 50° pitch. Don't ask me why...

  6. #6

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    Re: Compound shutter sizes

    Is it time to put this info up on the front page of this site as article? That would save peole searching for it.

  7. #7

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    Re: Compound shutter sizes

    47.5° is the old BA standard for fine screws and bolts. The thread profile was used for wide-bore precision threads too, so I suspect the 50° comes from there.

    64° seems odd, but then instrument makers are a funny bunch.

  8. #8
    All metric sizes to 24x30 Ole Tjugen's Avatar
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    Re: Compound shutter sizes

    I'll add the three types of "standard" Compur 2, too - same format as above:

    Compur 2-X Tube 5/I
    Compur 2-X Tube 5/II
    Compur 2-X Tube 6/II


    2-5/I : A: 45.8 x 40 t.p.i. B: 50 x 29 1/13 t.p.i. C: 35 D: 80.5 E: 35 F: 14.6
    2-5/II: A: 45.8 x 40 t.p.i. B: 50 x 29 1/13 t.p.i. C: 35 D: 80.5 E: 25 F: 8.3
    2-6/II: A: 49.65 x 40 t.p.i. B: 55.8 x 29 1/13 t.p.i. C: 35 D: 80.5 E: 30.8 F: 12.2

  9. #9
    Efaron
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    Re: Sinar shutter size

    Quote Originally Posted by Ole Tjugen View Post
    Since these come up quite often, I'll post what information I have here once and for all.

    All data are taken from the Compur Repair Manual, so they should be correct.

    There were five sizes of Compound shutter (late type, with X-sync):

    Compound 3-X Tube 7
    Compound 4-X Tube 9
    Compound 4-X Tube 10/II
    Compound 5-X Tube 12/I
    Compound 5-X Tube 12/II

    Dimensions are listed as:
    A: Cell thread (all are the same front and rear), all are 40 t.p.i.
    B: Flange thread
    C: Largest aperture diameter
    D: Body diameter
    E: Length
    F: Mount depth (flange to rear end of shutter).

    Data - all dimensions in mm :

    3-7 : A: 55.69 B: 60 x 29 1/13 t.p.i. C: 40 D: 87 E: 37 F: 15.7
    4-9 : A: 62.20 B: 65.9 x 29 1/13 t.p.i. C: 52 D: 106 E: 50 F: 21.8
    4-10/II : A: 67.92 B: 76.7 x 29 1/13 t.p.i. C: 52 D: 106 E: 45 F: 19.3
    5-12/I : A: 82.77 B: M90 x 1mm C: 64.5 D: 125.5 E: 74 F: 33.2
    5-12/II : A: 82.77 B: M90 x 1mm C: 64.5 D: 125.5 E: 60 F: 25.2

    Fastest shutter speeds are: #3: 1/100 #4: 1/75 #5:1/50

  10. #10

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    Re: Compound shutter sizes

    Ole, here are a few more Compurs and Compounds that I have discovered while researching the old Symmars:
    II or II S (Xenar 165/4.5, Xenar 180/5.5, Angulon 165/6.8)
    II 4/2 (Xenar 135/3.5, Tele-Xenar 270/5.5, Symmar 210/6.8)
    II 6/1 (Symmar 240/6.8, Symmar 270/6.8)
    III 8 (Symmar 300/6.8)

    Those are all from the 1935 US catalog. Post war, the lenses had either disappeared or changed to one of the sizes you mention.

    The only one of those above that I own is the 270/6.8 Symmar (actually a 27cm from 1928). Dimensions are the same as the 2-6/II except E=41.3 & F=19.

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