[time-nuts] Parts Selection

[Brooke Clarke]

Hi Bob:

Done it before - No.
	Have done 0.05" (1.27mm) pitch and it's easy.
Done it / last 2 years - No.
Set up to do it  - No.

I don't have a feel for the level of difficulty in working with 0.5mm 
pitch parts.  For example can you do it with a soldering iron (like I 
use for 0.05" pitch parts), or is some other method needed?  Will hot 
air work or is an oven necessary?
http://www.prc68.com/I/SMT.shtml

Have Fun,

Brooke Clarke
http://www.PRC68.com


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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