QFP footprint base with copper down the sides

[caius]

Hi all,
I successfully use Kicad since many years for all my projects and I found it a great piece of software.I’m running now into a problem, I’m designing a DIP to QFP adapter which will be made of two parts : a base with the QFP fooprint and a breakout PCB which will be puggled into the base.The problem is I don’t know how to add the copper down the side of the QFP base so that I can solder the pins.I can see that professional adapters use low profile leadless solution like this PGA to QFP one :

http://www.emulator-adapter.com/images/68pl-64qfs20-sd-89c51ed2.jpg

Or gull-wing solution :

https://images.app.goo.gl/pBaFtbFh7pnmN9Zk8

I Attach a 3D preview of the QFP base

Thanks in advance for any help or suggestion!

[halachal]

I would extend the copper past the Edge.Cuts line, and add copious notes to the fab so they know what you’re trying to do. Expect it to cost extra.

[caius]

Thanks for reply.I thought me too about your solution, I’ll try to enquire my manufacturer although i think they are not able to satisfy me.Another (rough) solution would be soldering single wires from pads of the base to pads of the PCB but it would be not a neat job.

[paulvdh]

Is this for a one-off, low part count, or industrial sort of quantities?
For low count you can solder wires in the holes first befoure mounting the QFP.

For higher quantities you should probably contact a manufacturer who has a bit of experience with this sort of thing. It’s also a bit unclear to me what you want exactly.

Maybe you can search for “castellated PCB”.
https://duckduckgo.com/?q=castellated+pcb&t=opera&iax=images&ia=images

[caius]

This is a DIP to QFP adapter and not viceversa so my goal is to solder on a QFP footprint (which lies on a specific board) the QFP base and then plug onto the base the DIP breakout PCB.
For the base I want something like this :

I hope it’s clear now.Thanks.

P.S.
It’s for a low part count project.