fischer ETICS-Fixings EWI catalogue Página 60
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Drilling The building material is decives when drilling. Four methods are available: Rotary drilling: Drilling in rotary mode without impact, with a sharply ground carbide drill bit. For perforated bricks and materials with low strength, the drill hole does not become too large with it and the bars in the perforated bricks do not break. Carbide drill bits drill faster if they are ground sharp, similar to steel drill bits. There are also special masonry drill bits available. Rotary drilling Impact drilling: Rotation and a high number of light impacts with the impact drilling machine, for solid building materials with dense structure. Hammer drilling: Rotation and a small number of minor impacts with high impact energy with the drilling hammer, also for solid building materials with dense structure. Basic Knowledge Basic Knowledge Impact drilling Standard carbide drill bits Sharply ground carbide drill bits Hammer drilling ▸ Expert tip • • • • For almost all permissible fixings, rotary drillings and hammer drillings are prescribed in the approval or guideline. Do not use drills with excessively worn out cutting edge width across corners anymore (see rules of approval). The drill hole depth is always specified exactly and based on a definite thickness of the anchoring base. The following rule of thumb is followed for general applications without approval: Necessary thickness of the anchoring base = drill hole depth + 30 mm. To avoid tilting of the fixture, it must always be drilled perpendicular to the anchoring base. Exceptional cases are regulated in the anchor approvals and/or the manufacturer’s specifications (up to 5 ° is tolerable). 6 57
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