Who suffered, making holes in concrete slab, knows that the best assistant in this case — a power drill. Well, if it does not exist? You will rescue two hammer and carbide drill bit d 4 and 7 mm. First, work a smaller drill bit and lightly hitting it with a hammer and turning a bit after each stroke. Breaking to a depth of 5-10 mm, model drill more and clean the resulting hole. The cycle is then repeated in 20 minutes manages to punch a hole to a depth of 40 mm.
Recommend to read
BLOWING? STOP
Have a bad fitting or old doors, Windows, vents blows very often in the cracks where the hinges. In other places it would be possible to adapt all sorts of seals, but here? However,...
WELDING CONTROLS ELECTRONICS
Many designs of metal collected with the use of electric welding. I made this several machines, and one was the most successful and easy to use. I offer welding transformer with...
