Beware the dreaded wobble

Date:20 August 2012 Tags:, , ,

I find that when using thin drill bits of the order of 2 mm in a drill press, the bit tends to bend and wobble when pressure is applied, resulting in a hole that’s off-centre. This problem is exacerbated in some woods where the drill follows the grain, resulting in the hole drifting from the perpendicular, sometime breaking the bit. To resolve the problem, I seat the drill bit as far into the chuck as it will go, leaving just a few millimetres exposed; this keeps the bit vertical and prevents the wobble effect. As the hole deepens, I extend the drill bit from the chuck, using the hole as a guide to keep it vertical. -RAYMOND BYNG, GROENKLOOF

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