Yes... I agree Greg. Consultation with the fabricator would be useful... in fact, if you could have them demonstrate the techniques so it could be looked at and evaluated before actually making the real board, this could be useful... you could test fit it in the enclosure and verify that it would work before committing to the final layout.
I've had blank boards made before when I needed to do something similar and the board geometry and fit was in question.
William Brooks, CID+
Senior MTS (Contract)
2747 Loker Ave West
Carlsbad, CA 92010-6603
760-930-7212
Fax: 760.918.8332
Mobile: 760.216.0170
E-mail: [log in to unmask]
-----Original Message-----
From: Greg Smith [mailto:[log in to unmask]]
Sent: Thursday, September 18, 2014 4:15 PM
To: (Designers Council Forum); Brooks, William
Subject: Re: [DC] Chamfered PCB
I assume that can be done but I expect the lower edge will be fairly ragged and quite fragile.
A lot would depend on the actual material chosen and the construction:
glass weave, glass resin ratio, # of layers, stack-up, etc.
Copper should be kept well away from the edges, esp the bottom edge.
On 9/18/2014 3:04 PM, Brooks, William wrote:
> I received a drawing from Michael and you are correct. It looks like it can be done. I believe the sharp edge on the board with the chamfer will be fragile. The fiberglass weave will likely also be exposed in places...
> __________________
> /__________________\ this will result in a cross section of the board thickness that looks like that...
>
>
>
> William Brooks, CID+
> Senior MTS (Contract)
> 2747 Loker Ave West
> Carlsbad, CA 92010-6603
> 760-930-7212
> Fax: 760.918.8332
> Mobile: 760.216.0170
> E-mail: [log in to unmask]
>
>
>
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Scott A. Bowles
> Sent: Thursday, September 18, 2014 2:14 PM
> To: [log in to unmask]
> Subject: Re: [DC] Chamfered PCB
>
> Maybe I am misunderstanding but I think Michael is actually asking about a beveled edge where the vertical edge (.062" thick) is not perpendicular to the top or bottom surface of the board, e.g., the bevel used on edge connector fingers. He is talking about a bevel being done on three of the four sides or edges of the boards. What it appears the responses are talking about is breaking the four sharp 90 degree corners of a square or rectangle board by adding what is commonly called a chamfer, typically 45 degrees as William states.
>
> As an FYI, adding a radius to the four corner actually works better than a chamfer but then again I don't think that is what Michael is asking.
>
> If it is a true bevel being required on three of the four edges, yes it is doable but would probably require special CNC machining by the board manufacturer due to the small size of your board. Possibly rout the profile for three of the four sides leaving the side without the bevel intact in the manufacturing panel. Then perform a CNC bevel on the three routed edges. Final step would be to rout the edge without the bevel.
>
> Hope I understood your question correctly and explained a solution to your question.
>
> Regards,
>
> Scott A. Bowles
> Staff Engineer - Printed Circuit Designer IV Engineering Services
> L3 Fuzing & Ordnance Systems
> 3975 McMann Rd.
> Cincinnati, OH 45245
> Office: 513-943-2483
> Alternate: 513-943-2499
> Mobile: 513-208-9009
>
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