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I'm having a weird problem with one drill bit. The chuck keeps loosening when I use it. It's a 12.5mm brad point bit, reduced shank. I'm using it in a full size drill press with a 5/8" chuck, tightened with a key. This morning I had to tighten it several times as I drilled 2" into an acrylic blank. This doesn't happen with any other bits, not even a 9/16" brad point, or a 10.5mm bit from the same manufacturer. Any ideas?

[QUOTE="qquake2k, post: 229292, member: 1150"] [SIZE=3]I'm having a weird problem with one drill bit. The chuck keeps loosening when I use it. It's a 12.5mm brad point bit, reduced shank. I'm using it in a full size drill press with a 5/8" chuck, tightened with a key. This morning I had to tighten it several times as I drilled 2" into an acrylic blank. This doesn't happen with any other bits, not even a 9/16" brad point, or a 10.5mm bit from the same manufacturer. Any ideas?[/SIZE] [/QUOTE]

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