The best way to do it is by boring holes with a coring bit which looks like an oversize hole saw minus the teeth and pilot bit.
How to cut a large hole in a concrete wall.
Here s a few pictures of the right tool.
These holes will mark the boundaries of the opening and help guide your cuts.
Once you are done with the drilling it will remove the large center piece to leave you with a large hole.
Get a friend to hold one end while you hold the other and run the line over the region to be cut.
A core drill with a diamond bit is the best option for round cuts that you can pass wires water lines or other things through.
A core drill is simply a drill bit used for making the large holes in concrete and masonry materials.
I ve hammer drilled through concrete to sink anchors but a 4 inch diameter hole is a little intimidating until you have the right tool.
When you re cutting concrete that is already poured and finished use a chalk line to mark the region.
Drill through each corner of your cutout using a rotary hammer equipped with a masonry bit.
Clean out as much debris as possible and use a shop vacuum to suck out the remaining smaller particles.
In place of the teeth is a smooth or segmented edge studded with tiny industrial diamonds that cut concrete and rebar by means of abrasion.
The size depends on the application.
The walls at our new place are 6 inch thick concrete it s an old naval base and we needed a few holes for vents.
Lift the line simultaneously from each end and slap it to the ground.
There are many core drill sizes and each one is manufactured to represent the size of a commonly used pipe cable or duct.
If you are going to cut a hole or drill through a concrete wall use the right tools to reduce the chance of damage to the wall.
Designate the area of finished concrete to be cut using chalk lines.
5 line up the blade of a.
Core saw or drill.
Scrape out the hole with a mason s chisel while dislodging loose or crumbling block.
You will find most core drill bits coming in different sizes such as 2 inches or 4 inches.
Before you start drilling.