A91-SSD_EU-EN

DRILLING | Structural Steel SoluƟons | 4TEX® Indexable Drill

Center Height Alignment Proper Center Line PosiƟon

A

x-axis of machine

DRILLING

Center Line

Core Area 0.5 mm (0.020")

B

BORING

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.

C

REAMING

Core

Center Insert

Center insert above center line

No core

D

BURNISHING

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

Center Insert

E

THREADING

1.0 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

X

Center Insert

SPECIALS

A91: 62

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