Thanks Bobc for this!
I was working to complete a KiCad footprint for an ON Semi 3.3V regulator, NCP117DT33T5G, in the DPAK package. I had four different sources, all of which should have been reliable, and I was not overly happy with any of them. So, I did this:
I created a FabLayer with the actual physical dimensions of the part. Most of the dimensions are exactly the middle of the tolerances, only a couple of the dimensions are slightly rounded a couple of thousands (with 20-40 thou tolerance range).
Do note that the project measures in inch units and this particular footprint is adapted to be well suited to an inch grid.
Here is the 3D view of a model on this footprint:
At the moment, it looks good enough to me for a first spin. Although, if anyone has reason to think to make changes, I’d like to read about it.
The point here is that none of the several sources agreed on any dimension… This was a little bit frustrating as I stated earlier that I consider all of the sources to be generally reliable.
This was my way to work through the problem in an attempt to create something that will work for my project. I thought I would share as it might help others in the future.