Le diamètre du forage de torsion est limité par l'ouverture, la rainure en spirale rend le carot de forage plus mince, la rigidité du bit de forage est faible; Twist Drill Bit pour le béton Seulement deux ceintures de côtes, l'axe du trou est facile à fausser; Le bord horizontal rend le centrage difficile, la résistance axiale augmente et le bit est facile à balancer.
2022/06/13
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