More then year ago I’ve read all KiCad documentation files then have a half year break. Then I have done some experiments and had next long break.
There are some things I know that I don’t know and probably more I don’t know that I don’t know.
Now I’m trying to do first PCB in KiCad 4.07 beginning with some mechanical information about my box.
When I press E on a line i can edit its parameters in absolute coordinates.
By pressing SPACE I can have new origin and can see my position as dx dy.
Is it possible to edit coordinates relative to that (or any other set by me) origin?
What is the function of the bottom key on right toolbar (probably “Set grid base point”)?
After using it I see crossed circle but can’t figure what it is for - I expected to have new origin, but it is not this - after E I still have absolute coordinates, and I can’t delete that useless (probably) circle.
I’m used to work (Protel 3 from 1997) in relative coordinates. specially for symmetric PCBs it is much easier. I don’t believe it is not possible here, I just suppose I don’t know how to do it.
The next to it key “Set base point for drill and placement” I also don’t understand. I am surprised that base point for drill and placement could be different than original point (0,0) for gerbers, but I have never went deep into production file formats. I suppose that by using this point I can do drill not match to gerber and someone will have to fix what I have damaged.
Do I have to set that point and if yes where in practic I should set it ?
I am also surprised that in Protel (the only PCB program i Know) X rises to right and Y to up, and in KiCad Y rises to down. Do one of these programs has to mirror y when generating gerbers or the gerber format (I don’t know) has a flag (or flags) specyfying direction for rise Y (and may be X).
I plan to compare simple gerbers (with one line) but not now.