How to chamfer a PCB edge connector

RE: How to chamfer a PCB edge connector

e14 Contributor — Fri, 18 Jan 2013 18:30:45 GMT

On Fri, 18 Jan 2013 12:46:56 GMT, Paul Anderson

>Thanks, and yes I should have noted the chamfer in question was on Sheet 3 to avoid the guesswork in answering my question, Drawing View 22 where it says "0.30 x 45 (BOTH SIDES)". This is a third dimension feature to bevel off the PCB edge and as far as I could tell EAGLE libraries work in 2 dimensions. I'll make a note to the fab house when I submit the Gerbers, and also note the gold finish is on the tFinish/bFinish layers (I started by copying package PCI-SLOT-60 from the standard con-amp.lbr and modifying it).

Typicall you would give the board house a Drill Drawing, that outlines

the drills and their placement, along with any other details like

Dimensions, board stackup/material, UL marking, masking, screening

color, finish(HASL etc), milling, stackup registration, warp/twist

tolerances and chamfers etc. The edge connector detail is outlined in

this drawing, including gold finishing. It allows a fast quote since

all the details for the board ( dimensions stackup etc) are on the

Drill Drawing.

Cheers

RE: How to chamfer a PCB edge connector

e14 Contributor — Fri, 18 Jan 2013 12:46:56 GMT

Thanks, and yes I should have noted the chamfer in question was on Sheet 3 to avoid the guesswork in answering my question, Drawing View 22 where it says "0.30 [.012] x 45 (BOTH SIDES)". This is a third dimension feature to bevel off the PCB edge and as far as I could tell EAGLE libraries work in 2 dimensions. I'll make a note to the fab house when I submit the Gerbers, and also note the gold finish is on the tFinish/bFinish layers (I started by copying package PCI-SLOT-60 from the standard con-amp.lbr and modifying it).

RE: How to chamfer a PCB edge connector

e14 Contributor — Fri, 18 Jan 2013 08:57:32 GMT

Paul Anderson wrote:

Hello,

I am wrestling with a problem creating a new library device. It is an edge
connector, and the manufacturer recommends a 45 degree chamfer on the PCB
edge see
http://www.samtec.com/documents/webfiles/cpdf/MEC2-XX-XX-X-D-DV-X-

FOOTPRINT.pdf

Presumably this is to help the PCB guide properly into the connector and I
am not sure how to do this, I am a relative newbie to EAGLE but not CAD
software. Creating new parts was no problem till I hit this.

Could someone share their secret?

thanks in advance

No secret. Eagle isn't a mechanical design package. Anything that involves

more than plunging a router or drill bit through a thickness of PCB material

involves making fab notes on the fabrication print and communicating the

necessary work to the board house. Even board thickness needs to be

communicated in that fashion.

For that connector, I'd lay out the package footprint as Samtec describes,

and then make a note in the symbol description stating how far back the

origin of the symbol should be from the edge of the board. When I placed

that symbol I would then know how far back from the board edge to place it

to account for the chamfer (Samtec has already done the math for you to

provide the proper pad clearance).

I would then make a copy of the chamfer drawing Samtec provides somewhere on

the fabrication print, using lines, arcs, whatever, and referencing the

appropriate edge of the PCB. I'd add a fab note to that effect as well.

Finally, I would communicate with the board house that a chamfer was

required when I submitted the board for production. At pretty much every

board house I use a chamfer is a 'full-featured' custom PCB quote (along

with the necessary gold plating, which is another fab note.)

RE: How to chamfer a PCB edge connector

e14 Contributor — Fri, 18 Jan 2013 02:39:08 GMT

Hi Paul,

I cannot open your link, but I think what you indicated is the "Gold

finger" chamfer? If right and you need to insert this board to a device. We

also suggest 45 degree for better connection.

In our company, we also will suggest our clients to do the chamfer if the

board will be used as connection.

Regards,

Lynn

mailto:sales@real-pcb.com

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