Please note the differences between a crimped connection and "MILITARY SPECIFICATION" (mil-spec) crimped connections. Most of the specifications being quoted on time-nuts are for mil-spec quality crimped connections. Most of the connectors hobbyist use are not mil-spec, but generic crimp connections that do not meet mil-spec quality. Quoting mil-spec specifications for generic crimps and connectors is like comparing apples to oranges. A mil-spec connector must be crimped with a routinely CALIBRATED" crimping tool specified by the connector manufacturer, or equal. These crimping tools are calibrated using dedicated procedures with go no-go gages, and a specified force test in a certified calibration lab. Mil-spec crimp connectors are constructed with specific materials to minimize corrosion, resistance, and dissimilar metal problems. Generic crimp connectors are constructed with unknown materials , resistance, and crimped with unknown crimping tools without calibration or specifications. Crimping or soldering can be done well, or poorly. Workmanship is the most important factor in a connection. Mil-spec quality crimps minimize workmanship errors, but are costly and require very specific processes. I do use generic crimp connections and understand that generic crimps do not meet Mil-spec crimp specifications. As a radio amateur, I have chosen Anderson Power Pole connectors for 12 volt distribution. Anderson Power Poles connectors have become the standard for 12 volt amateur radio power distribution. Crimped and soldered with silver bearing solder. There is little flexing or movement for my applications. Michael Smith KB0EW

-------- In message <CAPyrVOhgJufrjau1ZF_h6TxCpnBx=vi_++Gf4SS8YqHHnzo1Jg@mail.gmail.com>, Michael Smith writes: >A mil-spec connector must be crimped with a routinely CALIBRATED" crimping >tool specified by the connector manufacturer, or equal. You forgot the bit about "X percentage of all crimps must be destructively pull-tested" If people want to learn about connections, soldered, crimped and otherwise some very good articles can be find in the BSTJ around the time when they invented wire-wrap. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

On Mon, Oct 7, 2019 at 4:00 AM Poul-Henning Kamp <phk@phk.freebsd.dk> wrote: > > -------- > In message <CAPyrVOhgJufrjau1ZF_h6TxCpnBx=vi_++Gf4SS8YqHHnzo1Jg@mail.gmail.com>, Michael Smith writes: > > >A mil-spec connector must be crimped with a routinely CALIBRATED" crimping > >tool specified by the connector manufacturer, or equal. > > You forgot the bit about "X percentage of all crimps must be destructively > pull-tested" > > If people want to learn about connections, soldered, crimped and otherwise > some very good articles can be find in the BSTJ around the time when they > invented wire-wrap. Additional good reading on this topic is NASAs' "WORKMANSHIP STANDARD FOR CRIMPING, INTERCONNECTING CABLES, HARNESSES, AND WIRING", at https://nepp.nasa.gov/files/27631/NSTD87394A.pdf It really is a fascinating and useful read. W > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > phk@FreeBSD.ORG | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. -- I don't think the execution is relevant when it was obviously a bad idea in the first place. This is like putting rabid weasels in your pants, and later expressing regret at having chosen those particular rabid weasels and that pair of pants. ---maf