On Apr 15, 5:29*am, BQ340 wrote:
On 4/15/2012 5:23 AM, David Lesher wrote:

So I broke off a M3 tap in a block of 0.5" aluminum.

Its tip is barely emerging on the far side, and broken below
flush on the feed side.

Do you have a mill? A carbide end mill will remove it. Lots of air &
lock the quill & raise the knee slowly.

MikeB

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Drill from the back side and there's a decent chance that the drill
will unscrew the tap.