I have to cut a 100x500 mm hole in a concrete slab that is about 80-100 mm thick. I think that I have two options to do that:
1) 9" angle grinder with segmented diamond disc: cut the long sides, then chip away the short sides with chisel.
2) Hammer drill with with a large bit making holes close to each other and the just breaking it out with a chisel.
Option 1 is faster, but is more expensive (I also have to buy the disc besides the tool rent) and it looks kind of scary after I saw some kick back results.
Option 2 is cheaper (bits come with the tool rent), but seems to be more time consuming.
Both options will leave a rough finish that will demand for stucco or something.
PS: I can access the slab from the top and the bottom if it matters anything.