Hello,
I went into the Eagle (latest) PCB library for a TO220 FET.
I noticed that the footprint had the FET lying flat to the PCB.
There was a hole in the PCB to correspond with the screw hole in the heat tab of the TO220 FET.
This hole had a “dimension” layer circle around it.
Please could you tell why this “dimension” layer circle was used, as i am confused as i thought “dimension” layer was just for the PCB edges?
Try news.cadsoft.de
I found drastic differences between component libraries, and the “parts in my hand”. Some had larger leads then the outline specified, etc.
In making my own libraries, I used a plated threw-hole and increased it’s size (Drill size in Eagle) to about 0.125in for the BUF-634T. That size also seams to fit the LM78XX To220 things as well (with boards from BatchPCB).
When it comes to square leads, Never trust the PDF’s dimensions. Make a cheep measuring tape from the fab you intend to use (consisting of labeled plated threw-holes of increasing size, and measure the “parts in your hand”).
Best of luck, KB1NZG.