Re: gEDA-user: any last minute advice prior to sending out for PCB fab

[Steven Michalske <smichalske@xxxxxxxxx>]

On Feb 24, 2010, at 4:59 PM, Bob Paddock wrote:

> On Wed, Feb 24, 2010 at 7:47 PM, Steven Michalske <smichalske@xxxxxxxxx 
> > wrote:
> > On Feb 24, 2010, at 1:41 PM, Bob Paddock wrote:
> >
> > > To DJ's comment.  We usually do go with pre-programmed parts
> > > eventually.  Solder jumpers
> > > are a really bad  idea when doing anything more than few boards.   
> > > Even
> > > zero ohm resisters jumpers
> > > cost real money.
> >
> >
> > I believe it was my comment that referenced DJ's solder jumpers.
>
> Yes, sorry.
>
> > Solder jumpers are not always a really bad idea.  They can be hand  
> > populated
> > much easier than 0 ohm resistors and cost less.
>
> I'll stand by what I said.  Solder jumpers are a bad idea in any
> quantity beyond a few prototypes.

I guess my gripe is that your outright stating its bad,  when in truth  
its a manufacturing decision.
When it is the best choice for some assembly requirements, like  
connection sequencing.  e.g. Solder these 4 jumpers in order.

The example I know that is used in millions of products is generalized  
as this.

Solder these 20 wires onto the PCB, and tack this solder jumper.
The solder jumper uses the least effort of the assembly, and  
specifying the order of the wire connections doesn't omit the many  
momentary connections inserting the wire and soldering.

At times it is the only cost effective option.

Here the cost effective option is pre-programmed, no argument.
> > After the design is finalized a new board can be spun that shorts  
> > the jumper
> > with copper.
>
> I agree.
>
> > This jumper is much easier to apply than a resistor by an  
> > operator.  A hot
> > iron and solder are the only things needed,  not tweezers or parts.
> >
> > #2 is used to manufacture products built on the millions of units  
> > scale.
>
> I don't want to pay a person to solder that many jumpers.  Not a good
> use of their skills.

It is more of a waste to solder resistors.

I don't want folks to rule out this option because of the quote  
"Solder jumpers are a bad idea in any quantity beyond a few prototypes"

Steve



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