Alfa Main Catalogue Page 190
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THE CORE DRILL PRINCIPLE Metal core drilling in Germany was introduced by ALFRA ■ Core drills only machine a fraction of the material which a twist drill machines with the same bore diameter. Savings on machining volume of a core drill compared to a twist drill! 85% savings ■ A drill core remains which is ejected unmachined after drilling. ■ Therefore low drive power and feeding pressure are required. 81% savings ■ Pre-drilling must be done with twist drills which does not apply for core drilling and the desired diameter can be drilled directly. The main drilling times are significantly reduced depending on the bore diameter. 75% savings 64% savings 190
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