How to open the cement board
We are the first to draw a good position with a hand drill drill holes in the use of curved saws [hand saws] slowly saw the round hole out, that slot machine can also be used;
Punch with a drill or a core.
1), small points of the hole, less than 30mm use the impact drill, see how much you play the hole, there are large and small impact drill, there are different diameter drill.
2), relatively large 50mm or so to use the core machine, according to the size of a variety of sizes and depth of the core machine.
With a diamond drill with a hollow drill bit, drilling rig than the pistol drill, with a diamond out of the empty outer tube structured, if not drill through the general drill concrete will not fall off their own need to use hairpin removed. Generally with plumbing plumbing and electrician, installation of air conditioning transfer machine punch there.
