Solutions for Whitworth thread tripod mounts

[Leigh]

According to 1952 American Standards Association data sheets, tripod connections for American cameras are 1/4 inch 20 TPI UNC-1A and 3/8 inch 16 TPI UNC-1A.

As I mentioned previously regarding Class of Fit...

Class 1A is the loosest, and thus most likely to intermate successfully with BSW.

- Leigh

[Sevo]

According to 1952 American Standards Association data sheets, tripod connections for American cameras are 1/4 inch 20 TPI UNC-1A and 3/8 inch 16 TPI UNC-1A.

That might have been a US/British only definition, the Unified thread series was still quite new at that time. I can't locate the German/DIN tripod screw standard of the period, which could then still have been Whitworth (or the DIN metric definition thereof), as it was some thirty years earlier. In more recent years, the above (or something very similar) evidently has been the ISO definition, but that may have been a consequence of harmonization efforts (and UNC being a ISO adopted standard, while Whitworth is not).

[pmalsop]

$5 later, I have found a Whitword 3/8 bolt that fits the base plate, man they are expensive!
I think I have made a work around to attach the camera to a modern tripod
Watch this space! and thanks for replies

[E. von Hoegh]

The cutting angle changes the tpi, no?

No.

[Leigh]

The cutting angle changes the tpi, no?

No. The flank (cutting) angle changes the depth of the thread, not the pitch (turns per inch).

Thread depth affects the strength of the fastener, but has no other significance.

- Leigh

[Jac@stafford.net]

$5 later, I have found a Whitword 3/8 bolt that fits the base plate, man they are expensive!

They are dirt cheap here in the USA. Maybe you should have not got a Whitworth named fastener.

To others - thanks for the help with my understanding of the standards. Are you machinists? Engineers?

[E. von Hoegh]

They are dirt cheap here in the USA. Maybe you should have not got a Whitworth named fastener.

To others - thanks for the help with my understanding of the standards. Are you machinists? Engineers?

Practitioner of Obsolete Technology, specialising in watchmaking, hollow-state electronics, antique internal combustion devices, etc etc..

[Leigh]

Are you machinists? Engineers?

I'm a machinist (early career) and an engineer later on.

- Leigh

[Jim Jones]

. . . To others - thanks for the help with my understanding of the standards. Are you machinists? Engineers?

Another former hollow state-technician with practice in correcting the mistakes of electrical and mechanical engineers, and 60+ years of wasting hours improvising something that would cost a dollar. Leigh, I respect most engineers, but when they do screw up, WOW!

[Leigh]

Hi Jim,

An engineering education concentrates on learning the proper way to screw up.
No amateur methodologies here.

- Leigh