what do you use to cool the copper down, while drilling ....
remember.... as the copper heat up, the hole will tend do shrink.... ya I know it's suppose to expand, but because the heat is so local to the hole, it tends to shrink first, until the heat works it's way out into the surrounding copper... What does this mean... it means that as the hole heats up, it tends to pinch the bit, and from there the getting stuck part.... try cooling it with water while you drill... see if it helps.
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