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i'm just curious why periodically you have withdraw the bit from the hole as you drill thru concrete to remove loose dust and debris---what would happen if you didn't.
If you don't, you'll have excessive heat built up and your drill bit will go dull fast.
Eventually you would have so much debis in the hole that it would bind the bit.
Ditto what they said.
Regardless of the drill bit type and what you're drilling, the debris fills the flutes and won't eject on its own, especially from deeper holes. By pulling the bit out of the hole, you clear this debris, allowing the flutes to stay clear and pull the debris away from the tip, reducing heat, and preventing binding of the bit in the hole.
In the case of drilling concrete, it doesn't hurt to have a shop vac handy to suck the holes clean periodically too, again, clearing the debris helps the bit to cut better and last longer.
We use an air gun (with a compressor) to blow out holes in masonry when we are epoxying in anchor bolts,which needs a fairly clean hole. Even the blast of 120 psi air don't get the hole sanitary-clean, but it helps just enough so the epox. does its thang.