Page 639 - Iscar

USER GUIDE

Technical Information -
Notes for Guide Bushing Installation

Many of the problems in BTA drilling are caused by
incorrect use of the guide bushing. The shape, type and
tolerance greatly affect cutting accuracy and tool life.
Please note the following when using one in DEEP HOLE DRILLING
your application.

Resin Seal Type Guide Bushing Tolerance

Resin Seal

C0.3 0.5
˜
Up to 1 mm DG6 Dh6
Up to 1.5 mm

Workpiece Guide Bushing Oil Pressure Head
Tool Diameter G6
D (mm) Tolerance (mm)
8.00 - 10.00 +0.005 ~ +0.014
Taper Cone Type 10.01 - 18.00 +0.006 ~ +0.017
18.01 - 30.00 +0.007 ~ +0.020
30.01 - 50.00 +0.009 ~ +0.025
C0.3 0.5 50.01 - 80.00 +0.010~ +0.029
˜
80.01 - 120.00 +0.012 ~ +0.034
Up to 2 mm
120.01 - 180.00 +0.014 ~ +0.039
180.01 - 245.99 +0.015 ~ +0.044
Workpiece
Gap Guide Bushing Oil Pressure Head

Flat-edge Type

30 60°
˜
0.5 1.0 mm
˜

C0.3 0.5 Guide Bushing
˜

Workpiece Guide Bushing Oil Pressure Head
Recommended for Ø65 mm and less

635
635