[time-nuts] Parts Selection

Mark Spencer mspencer12345 at yahoo.ca
Fri Mar 25 17:26:52 UTC 2011


With regards to soldering .5mm pitch parts:

I've never done that professionally or as a hobby.

I don't see myself doing this at home.

On Fri Mar 25th, 2011 1:07 PM EDT Bob Camp wrote:

>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
>
> 
>
> 
>
> 
>
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