This mail has been sent to sourceforge this morning and was returned
without reason. Therefore, I forward this to your own mail address. P.
Andy, better keep fingers off that sort of thread (Panzergewinde,
Sta-Pa-Rohrgewinde). It was widely used, but only for unimportant
purposes (like protecting cables dangling form the ceiling to a
machine). The cutters had square outer outline and nobody had holders
for them, so they used monkey wrenches and pliers to turn them! Besides,
the norm says that the thread is cut only part way into the pipe wall so
that they are flat outside, having no sharp tips and little holding
power. The threads may also be hard to catch at mounting time, standing
on a ladder below the ceiling. And the pipes were rolled and seam
welded, leaving a sharp burr inside that might cut cable insulation.
This whole stuff is only for dirty purpose and no good craftsmanship. I
used up my last pipes to make handles for alu pouring equipment because
they will fit plastic bicycle handles.
Peter
Am 20.02.2018 um 18:38 schrieb Andy Pugh:
On 17 Feb 2018, at 15:26, Peter Blodow <p.blo...@dreki.de> wrote:
Am 16.02.2018 um 06:32 schrieb Chris Albert
I think this thread size os used for those very thin rings used for
electrical jacks and toggle switches. The ring nuts are only 2mm thick so
they need an ultra fine pitch.
...which usually is 0.75
Another way is to use a very large thread angle.
This one is metric on diameter, 80 degree thread angle and TPI pitch.
https://en.m.wikipedia.org/wiki/Panzergewinde
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