Please see: https://easyeda.com/Doc/Tutorial/PCBOrderFAQ#Half-cut-Castellated-Holes in: https://easyeda.com/order ![enter image description here][1] [1]: /editor/20170717/596ba0b964a1d.png

Thanks for the quick reply. Yes, I know the option is there. However I don't know how to place it in the layout and I don't seem to find description in the link you have provided (or I am missing it there...) thanks

When I simply create an outline and place a pad over the edge, I do not get a DRC error. At this point, neither the board outline nor the pad have net names assigned to them. ![enter image description here][1] If I then assign a net name to the pad and check the DRC Errors, I get a `track2pad` error. [1]: /editor/20170717/596bb7d67fb73.png

Oops, Didn't mean to post that before I'd finished it... If I then assign a net name (GND) to the pad and check the `DRC Errors`, I get a `track2pad` error: ![enter image description here][1] * I think that even if you get this error (but no others) then as long as you you tick the `Half-cut/Castellated Holes` option then EasyEDA will ignore those particular DRC Errors. [1]: /editor/20170717/596bb8e5456e3.png

Actually in my case I don't need the hole to be castellated, just to have the pad on top. It will be screwed, not soldered and I need the screw's head to touch the top plane. So if there is no better way to draw that in the tool I will leave it like that and see what happens when ordering. Cheers and thanks

How aout this alternative scheme. Construct a board outline with a semicircular cutout in the edge. Then place the copper area plane where you need. Next create a pad (of the same shape as half of the pad you have used in your original version) that will fit around the circular cutout and place it onto the edge of the appropriate copper area then give the pad the same net name as the plane. Place the pad just inside the Board Outline so it doesn't overlap the outline. That way it won't cause a DRC error.

That was my plan B, however I don't see how to create a pad with that shape. I could try with a Polygon, but those don't support arcs (I think) so I would have to interpolate with several points to make the curve. Would get the job done, but difficult and would look nasty. What I haven't tried is making a DXF with the pad and importing it as some sort of component and placing it that way. Not sure if that would work but I might give it a shot. Another option I was considering is a way to edit the solder mask itself and just remove some area. In my case the pad is just part of the top GND layer so that would also work. I can open the TopSolderLayer (which I suppose is the top solder mask) but I don't see a way to mark a region where it should be removed and expose the plain underneath.

Using g the arc tool I think you can create 2 semicircles as solid regions but create the smaller one as a hole in the copper. Then use the Align tool to set the hole part to the front. The Solder Mask layer should allow you to add a semicircle which will then be seen as the cut out that you want but check it in the Gerber viewer to make sure. Solder mask editing is being improved but it's a bit clunky right now.

See also: https://easyeda.com/forum/topic/soldermask_on_stencil_-IIU5FfPpm

And: https://easyeda.com/Doc/Tutorial/FAQ.htm#How-to-add-solder-mask

The second link just might do the trick. Indeed by adding a solid region in the TopSolderLayer and chec in the photo view I see the solder mask is removed. However when I place the solid region over the edge of the board outline it is not cropped. I have seen this happen with silk screens so I suppose that is not a problem. And the DRC does not complain. I suppose that solves my original question, except that I cannot make solid region that is not a polygon (one side being an arc for example). But I can live with that. ![TopSolderLayer Hidden][2] ![Region placement][1] ![How it looks in PhotoView][3] Cheers [1]: /editor/20170719/596f56c372d07.png [2]: /editor/20170719/596f56e36d69e.png [3]: /editor/20170719/596f56fe11996.png