If I had a bench grinder I might try that, I'm cheap. The trick is to balance the pressure to the material. Hitting aggregate "head on" kind of slows things down. I learned, very early in my masonry drilling "career", that the bit needs to be pulled out of the hole regularly, depending on how fast it's actually drilling, to prevent the spoils from clogging things and overheating the whole shaft of the bit not to mention the tip.
It is funny how what appears to be a "simple" project turns into a "holy crap what did I get into" project in one easy step. To complicate things I had bought 3/4" liquid tight conduit to run up the trees where the cameras are located. Now, I've got to use reducers to match that to the 1/2" PVC. I had pre-cut and painted the liquid tight in anticipation of 3/4" PVC so no going down to 1/2".
I originally thought about drilling through the sill of the framing but that would have meant exposed conduit at the house end of things. Then I decided to go through the foundation. It's been a downhill journey from there.
"I originally thought about drilling through the sill of the framing but that would have meant exposed conduit at the house end of things."
That's what I did when I ran underground electric from the house out to the shop, I took one look at the cellar wall and said Nope. The conduit doesn't bother me.
