Скачать с ютуб Drilling 4" Hole in concrete foundation Using Hilti DD 150-U Drill and core bit в хорошем качестве

Drilling 4" Hole in concrete foundation Using Hilti DD 150-U Drill and core bit

I had to drill a 4" hole in my concrete foundation which was about 11" thick. I attempted to do it first by perforating around the hole using a 1/4" hammer drill bit. It did not go well :) I went to the local tool rental place and they solved the problem. The drill worked well and the tips I would give for its use are: 1. Keep it straight and the core centered in the bit as you drill. I kept binding up and it was because I was tilting the drill too much and binding the core against the bit. 2. You don't need much water. Too much water flow pushes the bit back so use just enough water to create a bit of a slurry as it comes out the hole. 3. Let the drill do the work. Push on it and when you hear the RPM"S drop back off a bit. Total time to drill the hole was about 12 minutes.