IPC-610 is really an acceptance criteria, what it should look like after it is done. A company or industry can choose to use this or not. Some think it has caused companies to build in lower cost countries that don't actually follow it, but claim to. One of the major standards to build to is J-STD-001. I have and use that too, but IPC-610 has more info about what it should look like after it is done.
So, IPC-610 and J-STD-001 are what I am familiar with, so I use them and other referenced standards. They have three classes. Generally the highest Class 3 is considered for high performance or critical systems. If I was an automotive company, that is what I would use. For commercial products, lower Class 2 or even the lowest Class 1 might be OK. My work probably meets Class 1 most of the time. Some manufacturers have done things not in the specs for their own reasons, such as phone makers using low silver content lead free solder because it works well in shock (dropped phones) but not so much in vibration that may be found in aircraft or autos. The specs may be used for anything if you wish. NASA has had their own specs (NASA-STD-8739.3, superseded by J-STS-001-FS which I have never seen as I never worked on space products) and other manufacturer's may have their own specs too. I just don't know who actually uses them. You can Google these various standards and find some old versions for free, but most of the latest ones will cost you. They are long and boring, but I generally search for what I want to do and read that section. I used to work with some of the fine people who wrote the standards to point out the right sections to me. These standards are updated after thousands of hours of testing and experimentation. I was also able to watch some very skilled people solder. My skills pale in comparison, but I try. 73, Mark W7MLG On Sun, Mar 25, 2018 at 3:22 PM, N2TK, Tony <tony....@verizon.net> wrote: > Mark, > Does IPC-610 also cover automotive products? > N2TK, Tony > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mark Goldberg > Sent: Sunday, March 25, 2018 6:20 PM > To: Elecraft Mailing List <Elecraft@mailman.qth.net> > Subject: Re: [Elecraft] Resistor and capacitor installation techniques: > trim > before or after soldering? > > For commercial products, there is IPC-610. That is 400+ pages of > descriptions of how to determine acceptability of and build electronic > assemblies. It has very clear explanations and lots of pictures and > diagrams > of right and wrong ways to do things. > > Unfortunately, you may have to pay to get a copy. There are also a whole > series of more specific specification documents for certain operations, but > IPC-610 will have most of what you need to know. At least, it is what I > look > at first. > > Section 7.3.5.9 allows trimming after soldering if the trimming does not > damage the solder. For certain classes of products, a visual inspection at > 10X is required. Reflowing after cutting is also acceptable instead of > inspection. I believe there are special trimmers that minimize shock during > the trimming process. > > I attempt to follow IPC-610, although my skills may not be fully up to the > task. At least I know where I fall short. > > 73, > > Mark > W7MLG > > > On Sat, Mar 24, 2018 at 10:28 AM, 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 > > marklgoldb...@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 tony....@verizon.net > > ______________________________________________________________ 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
