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Sounds like the bit is blunt now. Maybe use cutting oil in future.
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Usually just needs a smaller pilot hole and work through more sizes to reach your goal.
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A combi drill even at low speed is probably running a bit fast for the job, I suspect. I use 3-in-1 sometimes for cutting oil, which is better than nothing. Try a fresh, small bit with oil as slow as you can get it. I'm 99% sure the plate isn't hardened.
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If the speed can be modulated further via the trigger, go slower on the low speed setting. With a fresh bit and cutting oil, and firm pressure. I went through a few bits drilling into 3mm stainless until I found the sweet spot.
Nef
Airhead
fizzy.bleach
Sharkstar
@Hovis
Trying to drill a few holes in some hardened (?) steel plate but having some trouble. First hole went fine, punched it, pilot hole then stepped up to final size. For the second one for some reason the bit just won't remove any material. Got a dimple, but the bit just spins, spins and spins. Snapped a few bits, bought a fancy cobalt bit set, still can't get through it.
Can anyone offer some wisdom as to what I'm doing wrong? For reference, its a 3 mm plate, the foot pedal on a workbench castor. Combi drill on low speed.