With an OD of 5/16" it's 1/16" NPT. Both 1/16" & 1/8" NPT are 27 tpi.
Straight pipe threads are used for electrical stuff; conduit fittings are threaded NPS as are lamp parts.
Roy
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--- In 7x12minilathe@..., ToolRoomTrustee@... wrote:
Classical meter wheel and four dial counter blocks from KAHLSICO.
In my 28 year working life on National Oceanographic and Atmospheric Research ships as an oceanographic
technician I often had to deal with the devices that measured amount of cable going out (and hopefully coming back!).
The technology of the times late 60s to mid 90s (in my career) used a stainless steel grooved wheel with a nominal circumference of
one meter that was suspended from a gantry or A-frame to allow working room for instrument packages. The wheel used a cable
similar to a speedometer cable to connect to a mechanical contrivance with four dials to cover units, tens, 100s and thousands of
meters. The meter wheel and four dial block used male threads to connect to female threads on end fittings of the connecting cable.
I was essentialy self taught on the job with my own Unimat at first then later got some end of fiscal year money to buy a Unimat for
my department. I determined that the threads were 5/16-24 which is a National Extra Fine so got a die and taps through govt supply
system. Much later found that it was actually a ?x27 pipe thread. The NEF tap did work.
My conjecture is that the NPT was used so the connections could be put on tight.
Anyway, my query here is if anyone else has some examples of where pipe threads are used but not on pipes.
Larry Murray
