Here are my answers: Done it before? - yes.
Done it in the basement / last 2 years? - Yes. In last 24 hours actually. Set up to do it in the basement? - Yes. Can do by hand, hot air rework tools, or reflow oven. Would I buy one? - done that before. Likely would again. (counts as a yes). Would actually do it in a reasonable amount of time? - Yes, other projects pending of course. And a +1 on the solder paste mask. 7-15x microscope makes it easy. Bob On Fri, Mar 25, 2011 at 1:19 PM, David C. Partridge <[email protected]> wrote: > Well, if you ship a paste mask with the PCB I've no problem at all, but > that's not likely to happen, so it's down to hand work. I've done that > before now and while it's not the easiest job, it's quite doable with a > microscope or the eyes of an eagle. > > Dave > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Bob Camp > Sent: 25 March 2011 17:08 > To: 'Discussion of precise time and frequency measurement' > Subject: [time-nuts] Parts Selection > > Hi > > > > Just a show of hands sort of thing. It comes up each time we talk about > projects and never really gets answered. Rather than trying to work it out as > a part of a project, let's see if it can be addressed by it's self. > > > > How many people are willing to solder up a project with multiple 0.5mm > spacing >=144 pin package IC's on it? There's a typical package drawing at > the end of: > > > > http://www.national.com/ds/DP/DP83816EX.pdf > > > > I'm sure it's a "what's in it for me?" sort of question. Let's assume it's > just neat piece of bench gear rather than a home grown cesium standard for > $100. > > > > I don't think this part really matters, but it might to some people. Say each > chip is well below $100, but above $20 each. There might be only one part > like this on some projects, but for the sake of this poll, let's say there > are two or three of them. Net is roughly 250 to 500 pins like this to solder, > on some number of packages. It's part of a project that will cost you $250 to > $500. > > > > I'm not talking about opinions on weather it can or can't be done. It > certainly can be done and is done every day. What I'm asking is - would you > buy a bag with the parts all in it? If you do are you going to put it > together in a reasonable amount of time? Reasonable time might mean > different things to different people. For the sake of completeness, yes you > also need to get it working after you assemble it. > > > > Next layer (you knew there had to be more) - have you done it before > (anywhere)? / done it in the last 2 years (at home)? / are you set up to do > it today (at home)? > > > > I'm not trying to get into "how would you do it / what would you need / could > you farm it out". Those are also neat questions, but not part of this. > > > > > I'll start off the voting (and yes the answers are out of order): > > > > Done it in the before - yes. > > > > Done it in the basement / last 2 years - no. > > > > Set up to do it in the basement - yes, but not set up well. > > > > Would I buy one - done that before. Likely would again. (counts as a yes). > > > > Would actually do it in a reasonable amount of time - unlikely. (That counts > as a no). > > > > Any more votes? > > > > > > Bob > > > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
