Page 15 - HOLE MAKING CATALOG p185-310

USER GUIDE
¿D
Machine Setup
DEEP DRILLING - BTA SYSTEM
STS and DTS Guide bush

Workpiece rotating system Tolerance
Guide bush tolerance should be G6 in order to keep
Workpiece - rotating Guide bush Tool - fixed consistent tool life and cutting accuracy. Diameters
for G6 tolerance are shown on the right.

øD (mm) G6 tolerance (mm)
16.00 - 18.00 +0.006 - +0.017
18.01 - 30.00 +0.007 - +0.020
30.01 - 40.00 +0.009 - +0.025

Up to Material System Advantage
0.02 mm Guide bush
material Cost efficient
• Only used when the workpiece and the (inexpensive)
tool axis are on the same line. Hardened steel Workpiece rotating
Long life
• Better hole straightness and wear resistance on guide Tungsten carbide Tool rotating guide bush
bush are provided compared to the tool rotating system. Workpiece rotating

• Keep the alignment between guide bush Guide bushing
and spindle within 0.02 mm. (use hardened steel or carbide)

Tool rotating system
Tool - rotating Guide bush Workpiece - fixed

Up to Coolant
0.02 mm
Temperature
• Can be used when the workpiece and the The proper coolant temperature is 30 - 40°C (90 - 100°F).
tool axis are not on the same line. If the temperature exceeds this range, the
coolant will deteriorate easily and may shorten
• Keep the alignment between guide bush tool life and generate poor surface finish.
and spindle within 0.02 mm.
Filtration
DTS The coolant must be filtered properly in order to
protect guide pads and workpiece surface.
Positioning of outer tube and guide bush
Be sure to set the outer tube more than 5.0 mm into Water-soluble type
the guide bush to properly supply the coolant. Around 10% (dilution rate 1/10) is recommended
for the concentration of water-soluble
Positioning of workpiece material and guide bush coolant in order to protect guide pads.
Sealing is not required for DTS because of the
vacuum effect, but keep the gap between workpiece
material and guide bush within 1.0 mm.

Workpiece Guide bush

Outer tube

Up to 1.0 mm At least
5.0 mm

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