Triangular drills can not only hit cement walls, but also tiles, red bricks and cement, but relatively high concrete beams and columns may not work, and an electric drill with impact can also be used. Because the ordinary electric drill has no impact force, it is difficult to drill through the cement wall, so it is necessary to drill through the cement wall with an impact electric drill.
When building cement walls, be careful not to build on the load-bearing wall, because the load-bearing wall bears the weight of the whole building, so it can't be dismantled and changed at will, and it is forbidden to make holes around the water and electricity pipelines. Because it is likely to hit water pipes and circuits, because the subsequent repair will still make the wall have color difference, which can not guarantee the overall beauty.
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A drill bit used by a drilling rig or a cutting tool used by a drilling rig is used for cutting circular holes, including twist drills, flat drills, center drills, deep hole drills and casing drills, and the drill bit includes a tool holder with a tip. The tip has two cutting blades located in one main plane, and the cutting blades have short central cutting edges oriented in the same second plane.
The cutting part of the flat drill is ground into a flat body, the main cutting edge grinds the front angle and the back angle to form a horizontal edge, and the auxiliary cutting edge grinds the back angle and the auxiliary deflection angle to control the drilling diameter. The flat drill has small rake angle, no spiral groove and difficult chip removal, but it is simple to manufacture and low in cost. It is widely used for machining small holes with a diameter below1mm.