Typically a .050X.050 chamfer works well.
Nope no extra charges for the chamfers and it's a nice thing to do for the poor folks that have to handle them all day.
:)
William Brooks, CID+
Senior MTS (Contract)
2747 Loker Ave West
Carlsbad, CA 92010-6603
760-930-7212<tel:760-930-7212>
Fax: 760.918.8332<tel:760.918.8332>
Mobile: 760.216.0170<tel:760.216.0170>
E-mail: [log in to unmask]<mailto:[log in to unmask]>
From: Jack Olson [mailto:[log in to unmask]]
Sent: Wednesday, March 06, 2013 9:46 AM
To: (Designers Council Forum); Brooks, William
Subject: Re: [DC] Edge spacing
I like the idea of the small corner chamfer, I haven't heard about that.
What dimensions do you use?
Do you ever get charged more for extra routing complexity?
On Tue, Feb 26, 2013 at 11:11 AM, Brooks, William <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Thanks, Dieter. :) Hope you are doing okay, long time since I have talked with you.
I have been pretty busy and have not posted in some time... here are a couple of thoughts for the questioner...
Usually I use 20 to 25 mils for copper to the board edge... this works for most standard board designs that I encounter.
It allows the bare board fabricator to bond the edges of the laminate well, leaving some tolerance for trimming, and usually we chamfer the corners of the boards to avoid accidental injury by the folks that assemble and handle them... 90 degree board corners can be pretty sharp... Typically a non plated thru hole will be a tooling hole or mounting hole... though sometimes it is necessary to break out the hole into a slot on the edge of the board to get the screw into the mounting area... of course there is board edge castellation that leaves a half diameter plated thru hole scalloped along the edge of the board interconnecting the edge of the board from top to bottom... and mouse/rat bite holes that allow excising boards from assembly panels. The spec is very thorough but it should not tie the hands of the designer... it really is intended to help standardize and save money and effort for all parties involved... which it does admirably! :)
Best regards,
William Brooks, CID+
Senior MTS (Contract)
2747 Loker Ave West
Carlsbad, CA 92010-6603
760-930-7212<tel:760-930-7212>
Fax: 760.918.8332<tel:760.918.8332>
Mobile: 760.216.0170<tel:760.216.0170>
E-mail: [log in to unmask]<mailto:[log in to unmask]>
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]<mailto:[log in to unmask]>] On Behalf Of Dieter Bergman
Sent: Tuesday, February 26, 2013 7:50 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [DC] Edge spacing
Hi Gary,
The present IPC-2222A states the following:
10.1.1 Edge Spacing Except for edge printed board contacts, the minimum distance between conductive surfaces and the edge of the finished printed board, or a NPTH, shall not be less than the minimum spacing specified in Table 6-1 of IPC-2221 plus
0.4 mm [0.0157]. Printed boards that slide into guides shall have a minimum external conductor to guide distance of 1.25 mm
[0.0492 in] or minimum electrical clearance (see Table 6-1 of IPC-2221), whichever is greater. Special design applications in areas such as high voltage, surface mount, and radio frequency (RF) technology may require variances to these requirements.
Ground and heat sink planes may extend to the edge when required by design.
The design should provide sufficient edge spacing to avoid unnecessary haloing and crazing rejections. Rejections can occur when the edge defect is greater than 50% of the clearance to edge spacing. Brittle material or heavier glass weights increase this risk.
The fabricator can do this, but from a design point of view we worry about edge defects the can impact the assembly performance.
Dieter
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]<mailto:[log in to unmask]>] On Behalf Of Gary Koven
Sent: Tuesday, February 26, 2013 9:10 AM
To: DesignerCouncil
Subject: [DC] Edge spacing
We design small form factor PCBs with board edge to copper spacing typically 0.25mm (0.010").
Thus far, no fabricator, whether our American prototype or our Asia Pacific production, has indicated this distance is a problem. Online prototype shops such as Advanced Circuits specify this distance as their minimum.
Which IPC document addresses minimum edge spacing? My copy of IPC-2222 is 15 years old,and I was not able to find this information in any other IPC specs on hand.
TIA and Best Regards,
Gary M. Koven, C.I.D.
InVue Security Products
Charlotte, NC, USA
Board Of Directors, RTP Chapter
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