[rollei_list] Re: ?? True Sizes of Tripod Mounting Holes

 
On Monday, August 27, 2007, at 07:50PM, "SandyF." <sbf70@xxxxxxxx> wrote:
>According to the Unified Standards, the following applies to UN Coarse Series 
>Threads
>
>Size      Basic      Threads/inch   Basic    
>            Major                            Pitch 
>            Dia. (in)                        Dia. (in)
>1/4-20   0.2500           20          0.2175
>3/8-16   0.3750           16          0.3344  
>The above information straight from my Machinery's Handbook, 21st ed.
>S. B. Friedman, aka
>SandyF  -----  Ö¿Ö¬
>_________________________________________________________________
>                
>Date: Mon, 27 Aug 2007 16:12:55 -0700 (PDT)
>From: John Jensen <jwjensen356@xxxxxxxxxxxxx>
>Subject: [rollei_list] Re: ?? True Sizes of Tripod Mounting Holes
>
Dear All,
My cousin back in Ireland has an old plate camera, which has two tripod holes, 
neither of which seem to fit a modern tripod screw.
Were there any other common standards, or was it just a matter of makers 
choice? From what I remember the camera in question was British, and close to a 
5x4 in size. All speculation or hypothesizing would be most welcome, though 
solid historical facts would of even greater value.
All the best
Larry Cuffe

>Marc, I don't see that there is an equivalence to the
>Unified thread and to a standard metric thread.  For
>the 3/8-16 thread the pitch distance is 0.0625".  This
>is equal to 1.5875 mm.  The 3/8" (0.375") thread size
>is slightly smaller than an M10 which has a thread
>size of 0.3937" and a pitch of 1.5 mm.
>
>If there were a hypothetical M9.5 thread (0.374") with
>a 1.5 mm pitch, it would come quite close to matching
>the 3/8-16 thread size.  But I don't see that there is
>such an animal.
>
>John
>
>--- Marc James Small <marcsmall@xxxxxxxxxxx> wrote:
>
>> I would like to know the true specifications of 
>> the two common tripod threads.  I believe that 
>> the larger thread has a Metric measurement which 
>> works with an SAE thread.  I would appreciate 
>> your help in providing the SAE and Metric 
>> measurements for both the smaller and the larger 
>> mounts.  Extra points to those who can identify 
>> the actual pitch of the thread (DIN, SAE, or
>> Whitworth, or whatever).
>> 
>> Enquiring Camera Lore Fanatics Want to Know!
>> 
>> Marc
>> 
>> 
>> 
>> msmall@xxxxxxxxxxxx
>> Cha robh bàs fir gun ghràs fir!
>> 
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>
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