Solid Carbide Drills
Deep-Hole Drills Application Rules
1) Pilot Drill Hole — IMPORTANT!
• The point angle of the pilot drill must be greater than
one of the following deep-hole drills to protect its
cutting corners.
• The diameter size of the pilot drill must be greater
than one of the deep-hole drills to enable easy fi t
and protect margin lands. The required difference
in diameter is covered by design with the different
position of tolerance.
• Drill Ø = nominal Ø up to nominal +0,010mm.
• Depth of pilot hole: minimum 2 x D.
• Deeper pilot holes are preferable.
Recommendations:
• Use a conical (TDS*) or split-point drill to pilot
(do not use a TDG, VariDrill ™ , or TDS 12 x D
or any competitive drill).
• Check the pilot drill for wear, which can lead to
premature wear on the TDD10* cutting edge and
possibly catastrophic failure.
• TOP DRILL S ™ for steel or cast iron (TDS4* series)
and TOP DRILL S + ™ for multiple applications
(TDS501* series 3 x D and TD502* series 5 x D)
with a 140° point angle are recommended.
• TDS503* series 8 x D and TDS504* series 12 x D
is not recommended as the point angle is 132°!
2) Feed TDD10* into Pilot Hole
• Max 500 RPM and recommended feed rate;
no rapid traverse.
• Run anti-clockwise, especially in horizontal
applications to protect the cutting edge,
when entering the pilot hole.
• Depth: 1mm above the bottom of pilot hole.
• Feed TDD10* into pilot hole
Recommendations:
• Reduce cutting speed to minimise imbalances in
machine spindle/adaptor!
3) Drill Hole
Cutting Parameters: Start recommended speed
and feed rate at 1mm from the bottom of the pilot hole,
clockwise.
Recommendations:
• DO NOT PECK OR DWELL up to 30 x D!
• With long-chipping steel materials, it may be necessary
to increase feed rate by 10–20% to provide optimal
chip control.
• For long-chipping aluminium materials, it may be
necessary to decrease feed rate and increase speed.
• Reduce feed rate on angled exits and crossholes
by 50–60%.
HP feed recommendations are usually higher than with competitive SC drills!
4) Drill Retraction
Cutting Parameters: 50–500 RPM and feed
rate 2–6 m/min.
Recommendations:
To achieve the best tool performance, we recommend
using the deep-hole drill with a hydraulic chuck.
Reduce cutting speed to minimise imbalances in machine spindle/adaptor!
• If the pilot holes are close to each other, chips can
fall into the neighboring hole.
• Do not enter a pilot hole that might contain chips
with a deep hole drill to avoid chip jamming, wear,
or breakage.
• If required holes are close to each other, use smart
drilling strategies, make sure the pilot holes are getting
properly cleaned, or switch to horizontal drilling.
Horizontal drilling process preferred for optimum chip evacuation.
T116
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5) Vertical Applications