how does a masonary drill bit get destroyed like this?

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17th March 2014, 11:10 PM
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how does a masonary drill bit get destroyed like this?
drilling some holes in concrete with my rotary hammer drill the other day, got to me third hole and got this awful smell then the drill stopped drilling properly, thought I had hit some reo but one closer inspection my drill bit had burnt out.
what causes this?? cheap drill bit? not doing anything out of the ordinary with it, not putting a lot of force on it, just drilling holes normally.
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