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

They appear to be both UNC and Whitworth.  One table I
have has the two, 3/8-16 and 1/4-20, as 'British Std.
Whitworth'

John

--- Frank Dernie <Frank.Dernie@xxxxxxxxxxxxxx> wrote:

> This doesn't help but I thought the two standards
> were both Whitworth  
> thread form not UNC.
> Frank
> 
> On 28 Aug, 2007, at 03:14, Laurence Cuffe wrote:
> 
> >
> > 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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