Not sure if my previous reply made it so I'm sending again..
More than likely his fab house added that small annular ring when they
processed his boards. Does anybody know which fab house and process he used?
The low cost specials usually do not allow unplated holes and that is what you
would get if you made the drill and copper the same size. They routinely add a
small annular ring so that they can plate the holes.
--- In kicad-users@yahoogroups.com, Bernd Wiebus <bernd.wie...@...> wrote:
>
> Hello.
>
> Sombody contacted me with a problem printing mounting holes at KiCAD. He
> tries to make them as single round Pad with same drill diameter and pad
> diameter, so the annular would be zero.
> But getting this out, he got a very very thin annular at the cooper
> layers, creating some trouble and rework.
> I do not really know, what he is doing exactly, because i do not knew
> anybody else, who has the same problem.
> Another guy who is using 20090216-final told as a tip, to uncheck al
> cooper layers, when editing the pad. This seems to work at the old
> 20090216-final, but at the new BZR2356 fom 05 Mai 2010, this will not
> work, because you get an error message, if you have not choosen any
> cooper layer.
>
> But he can import an old pad, created by this way, an use it. He can use
> it as a device, canging value and reference, but he cannot change the
> diameter, because this would mean to edit the pad, getting this error
> message.
>
> I searched for a workaround, and found this:
>
> 1. Create a single round pad with a hole of your wanted diameter.
> Perhaps choose same drill diameter and pad diameter, but this it not
> essential at last.
>
> 2. Name it "hole" and save it.
>
> 3. Open the library, where you saved it (make a safety copy first!) with
> an text editor.
> Now somewhere you will find the device "hole" at the text as:
>
> $MODULE hole
> Po 0 0 0 15 4BFFD155 00000000 ~~
> Li hole
> Sc 00000000
> AR
> Op 0 0 0
> T0 0 -2000 600 600 0 120 N V 21 N"hole"
> T1 0 2000 600 600 0 120 N V 21 N"VAL**"
> $PAD
> Sh "1" C 394 394 0 0 0
> Dr 394 0 0
> At STD N 0030FFFF
> Ne 0 ""
> Po 0 0
> $EndPAD
> $EndMODULE hole
>
> 4. Nnow change the line
> "At STD N 0030FFFF"
> to
> "At STD N 00000000"
> This will create a hole with no layers at all.
>
> As an alternative, change the line
> "At STD N 0030FFFF"
> to
> At STD N 01000000"
> This will create a hole with an annular at the drawings layer.
>
> ("At STD N 00010000" will do the same at layer glue bottom and
> "At STD N 00100000" will do the same at layer silkscreen bottom, for
> whom it concerns)
>
> 5. Write and save the file.
>
> 6. Use this hole just as a device.
>
> So he would be also able to use the layer drawings to print the annulars
> out, so he can see them and use them as drilling template.
>
> He will be also able to create a library with different drill diameters,
> to get easy access to this mounting holes. He edit this holes as a
> device, moving them around and canging value and reference, but he
> cannot change the diameter, because this would mean to edit the pad,
> getting this error message and preventing him to go on.
>
> What do you think? Any further suggestings for him? He suggests to make
> a function "hole" which means really a hole without cooper at all.
> I wonder, that this seems to be really a problem for him, and i am prone
> to suggest changing the errormessage to a warning. So it would be able
> to switch off cooper layers.
>
> For whom who understand german: You can read this discussion at
> http://www.mikrocontroller.net/topic/179308#1726876
>
> With best regards: Bernd Wiebus alias dl1eic
>
