When I went to “mil spec soldering school” at Sanders Associates in Nashua NH back in the 80’s we were taught to install the component and mechanically secure it BEFORE soldering. This included clipping the leads of resistors, capacitors, and so forth. Why? When you clip a component lead it creates a very small “shock wave” that passes through the lead and on to the component. In some rare cases this MIGHT weaken the solder joint. Our boards were even weighed before and after assembly to estimate the total amount of solder applied. ALL joints were inspected under a stereoscope. All of this (and more) was part of the quality control and assurance program. This helped to reduce MTBF (mean time before failure) for our circuit boards. In my case I installed BRD-6/7 RDF surveillance receivers on Nuclear Attack Boats. Failure was not tolerated. Howie WA3MCK
On Sat, Mar 24, 2018 at 13:29 Mark Petrovic <mspetro...@gmail.com> wrote: > While reading through my new K2 kit's control board assembly instructions, > I see that some builders prefer to trim the resistor and capacitor leads > before soldering. I'm intrigued by this, and wonder if someone who uses > this technique can share their experiences. Do you the solder the component > from the top of the board or bottom? How do you keep the component in > place during soldering? I am assuming the value of this technique is in > the resulting lower profile of the components on the backside of the board. > > Thank you. > > Mark > AE6RT > > -- > Mark > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to wa3...@gmail.com > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
