Some simple introduction diamomd core drill bits for

Twist is fixed by rotating the cutting axis relative to the workpiece hole drilling tools. Its capacity and shape into a spiral flute twist named. Helical groove has two grooves, slots or more grooves 3, but the most common two grooves.
  Limiting aperture diameter twist drill by  GUSHI concrete saws the spiral groove to make finer core drilling, drill bit low stiffness; only two edges with guide, easily skewed axis of the hole; chisel difficult to make a centering axial resistance increases, drill easy to swing. Therefore, the drilled hole shape and position errors. Twist the flank and rake face is curved along the main cutting edge the rake angle at each point, the angle  GUSHI metal grinding wheel is not the same as the front transverse edge of the corner of -55 °. Cutting conditions are poor; distribution along the cutting edge of the cutting speed is unreasonable, the maximum intensity of the lowest point of a sword cutting so badly worn. Therefore, the hole machining accuracy is low. The whole cutting edge of the drill cutting edges participants, each point on the cutting edge not equal, the chip is easy to form a spiral, chip difficult.
  Therefore, chips and the hole wall  GUSHI diamond discs friction extrusion often scratch the cell walls, a low surface roughness after processing.