On Wednesday, March 30, 2016 at 3:06:32 PM UTC-4, 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

"brick/tile stuff"

You might want to be just a tad more specific so that we know what kind
of hole saw you should be using.

If you are willing to settle for a 6" hole, Lowes has this hole saw, which
supposedly works for granite and masonry, for under $20.

http://www.lowes.com/ProductDisplay?...705-68082-9229

If 6" is too big, try contacting a rental shop in your area and see if they
have a kit of hole saws that you can rent for a day. Typically this businesses
have a much bigger selection than Home Depot.