topic Re: Mounting holes won't flood in EAGLE Forum

Mounting holes won't flood

Anonymous — Fri, 09 Jul 2021 16:22:40 GMT

I have some board-mounted d-sub connectors. I added pads to the footprint for the mounting holes. In the schematic, I tied the mounting hole pins to CGND. On my CGND plane, I set the parameters to no Thermals and flooded the CGND plane, but my newly modified footprint mounting holes won't flood (RATSNEST) , whereas other connector's mounting holes will. I've turned off and on thermals and Stop in the PAD parameters, but it makes no difference. The mounting holes clearly say CGND on them, so they are the same net as the plane.

Re: Mounting holes won't flood

Yura.Ivanov.VLuki — Sun, 24 Oct 2021 16:24:56 GMT

Re: Mounting holes won't flood

Anonymous — Sat, 10 Jul 2021 19:23:28 GMT

Yes, they already are connected to CGND in the schematic and it even shows
that net on the mounting hole itself.

Re: Mounting holes won't flood

one-of-the-robs — Sat, 10 Jul 2021 20:29:57 GMT

How did you create the hole in the library part?

Apparently many people feel the urge to put a HOLE coincident with the PAD just because it's for mounting. Why they should feel that urge is a mystery to me, given that all PTH pads inherently make a hole through the board - that's what the H stands for and it's how you are able to insert the pin. Just because those two extra pins are "mostly" mechanical (but also form an electrical connection to chassis ground) people seem to think they somehow need special treatment over and above what an electrical pin (that also serves to mount the component mechanically) needs.

Anyway, putting a HOLE there will create a virtual board edge, which prevents any flood fill connecting (and raises DRC errors if you manually route a trace there). If that's what you've done, just delete the spurious non-plated-hole.

Re: Mounting holes won't flood

Anonymous — Sat, 10 Jul 2021 20:57:28 GMT

Actually there was a hole on the Dimension layer that was giving me a DRC
error. I was unable to delete anything on that layer - hole-wise. What I
did was increase the pad drill size by 6mils (larger than the dimension
layer hole) , kept Thermals and Stop enabled and when I flooded the plane
with no thermals, it finally filled in and make the connections.