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Try drilling slowly Mark at around 450rpm and keep withdrawing the drill bit to clear the swarf. If the swarf builds up inside of the hole it will create internal pressures which will cause the blank to overheat and explode. Also let the drill do the cutting and try not to force the drill bit through. !!!

[QUOTE="Terry, post: 175196, member: 61"] Try drilling slowly Mark at around 450rpm and keep withdrawing the drill bit to clear the swarf. If the swarf builds up inside of the hole it will create internal pressures which will cause the blank to overheat and explode. Also let the drill do the cutting and try not to force the drill bit through. !!!:thumbs: [/QUOTE]

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