A91-SSD_ESM

DRILLING | Structural Steel Solutions | 4TEX® Indexable Drill

Center Height Alignment Proper Center Line Position

A

x-axis of machine

DRILLING

Center Line

Core Area 0.020" (0.5 mm)

B

BORING

0.020" (0.5 mm)

0.007" (0.2 mm)

C

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

REAMING

Core

Center Insert

D

Center insert above center line BURNISHING

No core

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

Center Insert

E

THREADING

0.040" (1.0 mm)

0.020" (0.5 mm)

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

X

SPECIALS

Core

Center Insert

A91: 60

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