On Wednesday, March 30, 2016 at 3:43:15 PM UTC-4, wrote:
On Wed, 30 Mar 2016 19:03:12 -0000 (UTC), Mike
wrote:

I have this brick/tile stuff that is structural for this build. The
building is 70+ years old. Home Depot has a bit that I can bore
through the brick/tile that is just a hair over 4" OD. I have a
scrap of steel pipe I want to put through the hold to reinforce the
brick/tile after I bore the hole. This steel pipe is about 4.5" OD.
I can rent the bit and drill from Home Depot to make the initial
hole, but still need to increase the hole diameter for the steel
pipe. I thought of using some sort of grinding stone to make the
hole bigger for the steel pipe. Is there a better way to make the
hole or to widen the hole for the pipe?

Once the pipe is in the hole I plan to concrete around the pipe and
fill the voids in brick/tile. Once the concrete (Sackrete Sand Mix)
hardens I'll run a 3" schedule 40 septic pipe through the steel and
spray foam the space between PVC pipe and steel pipe.

TIA

Mike

I'd first see if you can get a 5" bit. Maybe even a 6" which would be
common for heating ducts. You can always mortar it in. Thats better than
trying to break it out with a chisel, which could damage the tile.
Grinding will probably work, but it will be real slow and likely eat up
several wheels.


+1 A hole saw the correct size is what I'd do. Trying to chip out
from a smaller hole is not only a lot more work, it may crack the tile.