Had to fit a fan t'other day, 4" hole in brickwork.
Not engineering bricks, but piggin hard. Progress was slow.
After the core drill had cut a circle about a 1/4" deep, I decided to chain drill around it with a 5mm SDS.
Speeded up the core drilling no end, at least twice as fast, maybe more.
Worth a try.
Sounds like it needed help clearing the dust which the holes have it.
TCT core bits on hammer can be quite a lot faster than pure diamond cores too - but destructive if you leave the hammer on on the last inch.
Nest step would have been dynamite then... Brian
Useful tip for my next bank job, thanks :)
Yes, that works well. I always do it except for very soft masonry. A few years back we had this horrible job where we needed to get a bunch of cables through six walls in a jail. The walls were cast concrete. We wore out a lot of drills but we managed it.
Bill
A lot of the early C.20 houses in my area were built of bricks made from local clay with a high iron content, which makes them hard to drill or cut neatly --- sometimes just difficult to cut, sometimes random bits fall out in the middle of the job. (I've also seen sparks fly out of them while I was chiselling.) The bricks are red on the outside but often have brown bits inside.
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