DLE

Drill Diameter Selection

When Chamfering

With respect to guide hole diameter D, select the drill diameter (cutting diameter) DC to be within the range of D < DC < 2D.

When Centering

The tool cannot be used for processing if the centering diameter has the same guide hole diameter as drill diameter DC. Refer to the usable length LU as a guideline.
In the case of tip diameter SIG 60 °, 90 °, about DC/4 which becomes a two-step point angle area does not become the bottom hole of 60 °, 90 ° respectively and chamfering is not possible.< 2D.

OPERATIONAL GUIDANCE