Page 92 - HOLE MAKING CATALOG p185-310

DEEP DRILLING - BTA SYSTEM USER GUIDE

Technical Information - Notes for Guide Bushing Installation Flat Edge Type

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 your application.

Resin Seal Type

Resin Seal

C0.3 ˜ 0.5 Workpiece Guide Bushing Oil Pressure Head
Up to 1 mm Recommended for Ø65 mm and less
Up to 1.5 mm 0.5˜ 1.0 mm
30˜ 60°

Workpiece Guide Bushing Oil Pressure Head

Taper Cone Type

C0.3 ˜ 0.5 Guide Bush

C0.3 ˜ 0.5 Guide Bushing Tolerance
Up to 2 mm

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
+0.012 ~ +0.034
80.01 - 120.00 +0.014 ~ +0.039
120.01 - 180.00 +0.015 ~ +0.044
180.01 - 245.99

276 ISCAR