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DRILLING | Structural Steel SoluƟons | 4TEX® Indexable Drill

Cuƫng Diameter and Center Height Adjustment Center Height Alignment: Proper Center Line PosiƟon

X-axis of Machine

Center Line

Core Area 0.5 mm (0.020")

A91

0.5 mm (0.020")

0.2 mm (0.007")

Proper Center Height Alignment • The correct center height alignment will posiƟon the center insert 0.2 mm (0.007") below the center line.

Core

Center Insert

No core

Center insert above center line

Center Insert Above the Center Line • This will cause fracturing of the center insert. • Requires center height adjustment.

Center Insert

1 mm (0.040")

0.5 mm (0.020")

Center Insert Too Far Below Center Line • This will cause the drill to interfere with the drilled hole. • This will impede chip evacuaƟon on the periphery insert. • Requires center height adjustment.

Core

Center Insert

A91: 65

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