Page 278 - ISCAR(HOLE_MAKING_CATALOG_65)
P. 278
USER GUIDE
DEEP DRILLING - BTA SYSTEM
Technical Information - Notes for Guide Bushing Installation
Many of the problems in BTA drilling are caused by Flat Edge Type
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 your application.
Resin Seal Type
Resin Seal
C0.3 0.5
˜
Up to 1 mm Workpiece Guide Bushing Oil Pressure Head
Up to 1.5 mm Recommended for Ø65 mm and less
30 60°
˜
Workpiece Guide Bushing Oil Pressure Head
0.5 1.0 mm
˜
Taper Cone Type
C0.3 0.5 Guide Bush
˜
C0.3 0.5
˜
Up to 2 mm Guide Bushing Tolerance
Workpiece DG6 Dh6
Gap Guide Bushing Oil Pressure Head
Tool Diameter D (mm) G6 Tolerance (mm)
8.00 - 10.00 +0.005 ~ +0.014
10.01 - 18.00 +0.006 ~ +0.017
18.01 - 30.00 +0.007 ~ +0.020
30.01 - 50.00 +0.009 ~ +0.025
50.01 - 80.00 +0.010~ +0.029
80.01 - 120.00 +0.012 ~ +0.034
120.01 - 180.00 +0.014 ~ +0.039
180.01 - 245.99 +0.015 ~ +0.044
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