[time-nuts] OT stuffing boards: was GPS interface/prototyping board

Don Latham djl at montana.com
Fri Jun 24 12:52:24 EDT 2016

I do not see why a small pick and place assist system could not be built on a 3-d printer.

> On Jun 24, 2016, at 8:32 AM, Attila Kinali <attila at kinali.ch> wrote:
> On Thu, 23 Jun 2016 20:16:34 -0500
> Oz-in-DFW <lists at ozindfw.net> wrote:
>> 1. Pick and place machines use a lot of floor space (even for the
>>    "small" ones are more than 1/2 a bench.)
>> 2. Even the best ones require pretty continuous tuning. If you aren't
>>    using them continuously each new run is a new and different
>>    experience.  Often unpleasant for the first few scrapped boards.
> The trick is to use semi-manual pick&place machines for low volumes.
> Ie machines that you do not program, but guide by hand. This allows
> faster and more accurate placing of components than would be possible
> with a pure manual process, but does not have any of the complexity
> of the fully automated solutions. The components do not need to be
> 100% exactly centered, as the surface tension of the molten solder will
> pull the parts into place (which is also the reason why the copper inside
> the solder resist mask should be symmetric).
> These machines are still all pretty expensive (IMHO, the cheapest
> start from around 2kusd IIRC), but with the continuous growth of the hobbyist
> market, and that market becomming more and more professional/proficient,
> the production volumes of these  machines will for sure rise and thus become
> cheaper. I am pretty sure that we will see hobbyist marketed pick&place systems
> build upon open source based control systems in the next couple of years.
> There are already a couple of DIY systems out there, that look quite good.
> e.g http://vpapanik.blogspot.de/2012/11/low-budget-manual-pick-place.html
> http://www.briandorey.com/post/Diy-Manual-Pick-and-Place-Machine-part-1
>> Solder stencils make **all** the difference.
> Oh, yes! Please, do not try syringe dispensers! These fail more often than
> they work. Also pay the additional couple of bucks to get a steel stencil
> instead of a kapton one. Especially if you make more than one or two boards
> or those with fine pitch.
> 			Attila Kinali
> -- 
> It is upon moral qualities that a society is ultimately founded. All 
> the prosperity and technological sophistication in the world is of no 
> use without that foundation.
>                 -- Miss Matheson, The Diamond Age, Neil Stephenson
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Felix qui potuit rerum cognoscere causas.
Lucky is he who has been able to understand the causes of things.
"Noli sinere nothos te opprimere"

Dr. Don Latham, AJ7LL
Six Mile Systems LLC, 17850 Six Mile Road
Huson, MT, 59846
mailing address:  POBox 404
Frenchtown MT 59834-0404

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