Core drills with 1 or 2-speed gearbox. Which is better?
Question:
Core drills with 1 or 2-speed gearbox. Which is better?
Answer:
If core drilling is only carried out in the diameter range of 12 - 35 mm, it is sufficient if the machine only has one mechanical speed. This is usually approx. 450 / 500 rpm (KBE 32 / KBE 32 QW) Some core drilling machines are also equipped with an electronic speed setting. Here it is possible to reduce the mechanical speed by up to 50%. However, it should be borne in mind that a slower speed also means less motor cooling through the fan wheel (KBU 35 Q / KBU 35 QW). 2nd gear machines are used in the diameter range from 12 - 65 mm. The two speed levels of approx. 250 / 500 rpm allow the speed to be adapted to the core drilling diameter and are also significantly more versatile in terms of the material to be drilled (KBM 50 Q, KBM 50 U, KBM 65 U / KBM 50 UQW, KBM 65 UQW)