Dennis or others,
What exactly are you measuring, center to center or edge to edge? By
the comments I would have to think center to center spacing but just wanted to
confirm that (i.e. 35 mils = bridges. I would think so!).
Dennis, the main issue is the PnP head's diameter or width. In our case
we have an older PnP machine and we are forced to use 30 mils part edge to part
edge strictly because of the PnP head diameter of 0.060". You don't want the
head to collide with adjacent parts that were already placed. We should
probably allow just a little bit more but that gets to expensive on board
realty and it is a pain for placement grid.
Sincerely,
Brad Velander
Senior PCB Designer
Northern Airborne Technology
1925 Kirschner Rd.,
Kelowna, BC, V1Y 4N7.
tel (250) 763-2329 ext. 225
fax (250) 762-3374
-----Original Message-----
From: Kathy Quinlan [mailto:[EMAIL PROTECTED]
Sent: Sunday, February 20, 2005 1:29 PM
To: Protel EDA Discussion List
Subject: Re: [PEDA] how close 0603
Dennis Saputelli wrote:
>
> thanks Kat
> i don't know where these will be built (yet)
>
> i'm sure these numbers are all over the place
>
> what sort of spacings have you seen w/ modern machines ?
>
> i've done stencil/solder paste with hand placement at 50 mil center to
> center (side by side) and didn't hear any squawking
>
> i have a spot where 40 would be nice :)
>
> Dennis Saputelli
>
Yeah, 50 mil is about the smallest I go for hand, had one board house in
AU who could do 35 mil but it was tight and had alot of issues with
solder bridges :( so now I mainly stick to 50mil
Regards,
Kat.
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