im working on a haas tm 3 and am drilling through aluminum that is 6 1/4" thick. i was drilling through 4 1/5 " aluminum and the program worked great, but a quarter of the way through the machine stopped because the drill bound up in the hole. probably because of improper chip clearance. then i edited the program and slowed the feed rate down and set the retract height to .2 inch above part. then drilled the same hole and the drill shattered. im using deep hole peck drill taking .075 each peck feed rate was 3.25 then slowed down to 2 after the slip, then the drill broke. is there a better way to clear the chips out of the hole or what am i doing wrong? any suggestions are helpful

thanks,

matt