Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

>
> On 9/20/06, Leon Heller <leon.heller@...> wrote:
>> ----- Original Message -----
>>
>
>> Sent: Thursday, September 21, 2006 12:27 AM
>> Subject: Re: [Homebrew_PCBs] Re: SolderPaste dispenser and Pick and
>> Place.
>>
>>
>> >I just went to the Cadsoft website under ulp I still don't see the
>> > file with the name smd-coordinate.ulp. You are probably right there is
>> > better way to do it. If I ever find this ulp I will give it to Steve
>> > to try. At the time that we did it there was nothing we found that was
>> > available. You need 2 different reference points the center of the
>> > part for pick and place and the center of each pad for solder paste.
>> > One axis sorting does not give you the optimal g-code with the fewest
>> > moves. Pads right next to the other pad will be skipped and come back
>> > to latter. An intelligent sort that can handle 2 axises at the same
>> > time is what is needed.
>>
>> The Pulsonix software I use can output a pick and place file, here is
>> part
>> of one for one of my boards:
>>
>> Ref Part Name Side Placement Centre Rotation
>>
>> IC1 16F88 Top (363.22,570.23) 0
>> CONN1 2X1 Top (349.92,591.18) 90
>> CONN2 3X1 Top (343.61,558.16) 0
>> CONN3 Top (343.61,547.37) 0
>> IC3 78L05 Top (350.52,585.47) 270
>> C1 C1 Top (354.33,556.89) 0
>> C2 Top (356.24,539.75) 180
>> C3 Top (361.95,539.75) 180
>> C4 Top (356.24,542.29) 180
>> C5 Top (361.95,542.29) 0



----- Original Message -----
From: "Derek Barger" <Denvercnc@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, September 21, 2006 7:04 AM
Subject: Re: [Homebrew_PCBs] Re: SolderPaste dispenser and Pick and Place.


> Sure that looks fine for the center that is easy. Your first chip can
> be an 18, 20, 28 pin package. You have to find every pin location for
> that chip to put the solder paste down. That is the center of the pad
> most of the time. Will that program do that and does it work with
> Eagle? Looks like a good program but since the Eagle is paid version
> we need to use it.

I wish people wouldn't 'top-post'! 8-( I've corrected it.

Pulsonix is the PCB software I use, and that output is one of the standard
output reports. It's not suitable for solder paste deposition, I think that
is done with a stencil by most PCB suppliers as it gives much better control
of the thickness and area covered and is much faster. I think a report could
be generated that is suitable for CNC placement of solder paste.

Leon
--
Leon Heller, G1HSM
Suzuki SV1000S motorcycle
leon.heller@...
http://www.geocities.com/leon_heller