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Date:	Thu, 28 Feb 2013 12:13:45 -0600 (CST)
From:	kqt4at5v AT gmail DOT com
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Subject:	Re: [geda-user] surface mount confusion
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On Thu, 28 Feb 2013, Dave McGuire wrote:

> On 02/28/2013 12:00 PM, kqt4at5v AT gmail DOT com wrote:
>>>>>> Being a beginner with not so steady a hand I choose to stick to
>>>>>> through hole devices But I just tried a simple board with a soic
>>>>>> chip I made a breakout board for TPIC2810D 1 chip and a single
>>>>>> row header of 16 pins The board is single sided so the chip is on
>>>>>> the solder side and the header is on the opposite side I setup
>>>>>> the board so pin 1 of the chip is connected to pin 1 of the
>>>>>> header and so on When viewed in pcb the traces appear not be
>>>>>> connected correctly but when I export to gcode they are correct
>>>>>> Would someone set an old fella straight
>>>>>
>>>>> I would love to help but I'm not sure I understand specifically
>>>>> what the problem is...can you describe what you mean by "traces
>>>>> appear not to be connected correctly"?
>>>>>
>>>>>> If I were to try this on a more complex board it would make me
>>>>>> crossed eyed
>>>>>
>>>>> Nah...I lay out surface mount PCBs and build prototypes for them
>>>>> all the time.  It's just a different skill set from doing
>>>>> through-hole work. I actually despise through-hole work anymore,
>>>>> and minimize it when possible.  (not just due to the additional
>>>>> assembly cost when a design goes to volume production!)
>>>>>
>>>>
>>>> I attached screwed up pcb
>>>
>>>  Ok.  At first glance, it appears that the traces are on the bottom
>>> (solder) side of the board...they will of course make contact with the
>>> through-hole header pins, but the footprint for the TPIC2810D is on the
>>> top (component) side of the board...there will be no electrical
>>> connection to them.
>>>
>>>  You'll need to either redraw those traces on the top side of the
>>> board, move the chip to the bottom of the board, or use vias to get
>>> those signals up to the top of the board.  Get it?
>>
>> Got it
>> This was good little practice
>
>  Yes.  Good luck with your board!
>

One off topic question
Can I save the setting for gcode export
I have to reset all of them every time

Richard

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