Brad,
I agree, at somepoint you need to switch from a round hole to an elongated
hole to allow for saw kerf.
Steve C
On Fri, Sep 17, 2010 at 8:54 AM, Brad Saunders <[log in to unmask]> wrote:
> Regarding castellation boards, Cosmotronic mentioned earlier does a very
> nice job (I worked for those good folks for years) and also down the street
> 30 minutes Speedy does a nice job (I understand Vermont is very nice however
> I have never worked with them), the other guys who have very nice display
> including this is Eltek. I fully agree with diamond saw method and have
> gone that route (or rout). It is, as always, about volume and if has
> substantial volume find another way as this straight forward method has poor
> yield that is wrapped into price.
> A defeating scenario is low pitch. At .050 we had discussions on design
> configuration, at .025 the discussion become quite a bit shorter and if you
> are at sub .020 pitch you have extremely limited choice. Meaning the saw
> edge travel is a straight line and in a small diameter hole the tolerance of
> travel location is critical lending itself to to little PTH left and or
> empty sites. Get a quote, it should tell all.
> My advice, don't build your Castle-ation on a sand foundation.... TGIF
> BB
> ----- Original Message -----
> From: Steven Creswick<mailto:[log in to unmask]>
> To: [log in to unmask]<mailto:[log in to unmask]>
> Sent: Thursday, September 16, 2010 8:03 PM
> Subject: Re: [TN] looking for castellation board vendor recommendation
>
>
> Richard,
>
> Can not recommend a specific supplier either, however would recommend that
> you diamond saw the boards to singulate rather than score and break, etc.
>
> Most hybrid mfrs that deal with ceramics, or dicing of wafers can easily
> saw
> generic laminates, leaving the module with mirror smooth edges and little
> tearing, smearing of the castellation metallization. Amounts to selection
> of blade, feed and speed. Have diced boards ranging from 0.010-0.062"
> thick
> using this method.
>
> Since your have a single-sided board, one would just attach the board to a
> sacrificial plate [glass for example] with a water soluble wax after
> assembly. Problems will surface if the board is warped, or tall
> components
> are near the edges where the hub of the dicing blade may hit.
>
> Getting the board is the easy task. Am sure that you can find a facility
> somewhere nearby that can dice them for you...
>
>
> Steve Creswick
> http://www.linkedin.com/in/stevencreswick<
> http://www.linkedin.com/in/stevencreswick>
>
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Hatano
> Sent: Tuesday, September 07, 2010 1:57 PM
> To: [log in to unmask]<mailto:[log in to unmask]>
> Subject: [TN] looking for castellation board vendor recommendation
>
> Hello Everyone,
>
> It's been a few years since I've been on TechNet, and it's good to see
> some
> familiar names. I hope you're all doing well in these difficult times.
>
> I know my question begs more questions, but I would like to hopefully keep
> it simple by asking if anyone can recommend a pcb fab company to get some
> boards with castellated edges made.
>
> Right now these are prototype and I don't know what the quantity will
> eventually be. Other than the castellation there is nothing strange about
> them. They are less than 1 sq. in. in area, 4 layer, SMD one side, 6/6
> mil
> trace/space, 14 mil via. Having thinner boards (0.031") would be
> preferred
> but seems to really impact cost, so it is a secondary parameter.
>
> If anyone can reply with a recommendation it would be hugely appreciated.
>
> Thanks,
>
> Richard
>
>
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