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Message No. 26438, Started by mcneilinstruments on 12/26/21

I’m trying to drill a hole through a steel plate, approx 5mm thick, I’ve started with a smaller bit and then changed to a bigger one, this went through quite good, but, I need the hole to be slightly bigger, enough to get a 10mm bolt through. I therefore changed the bit to another, slightly bigger but when I try to drill into the hole the drill is literally bouncing off, I’ve given it a few goes but it continues to happen.
Any help where I’m going wrong would be greatly appreciated.

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