Page 585 - Iscar

USER GUIDE

Recommended Drilling Procedure for Deep Hole Drilling (20XD)

1. Drill a pilot hole 1-2*D deep with a short drill. The pilot
drill should be 0.03-0.05 mm larger than the long drill 1
and its point angle should also be larger (over 140°).
2. Enter the pre-hole using low speed and feed until it 2
engages the material. SOLID CARBIDE DRILLS
3. Increase cutting speed and feed to recommended
conditions – no pecking is required! 3
4. After having reached the required depth, reduce speed
by more than 50% while retracting from the hole. 4

Recommended Drilling Conditions for Solid Carbide 20xD Drills
Carbon Steel Alloy Steel Cast Iron Ductile Cast Iron
Drill Dia. (30 HRc) (45 HRc) Stainless Steel (GG25) (GG45)
(mm) V(m/min) f(mm/rev) V(m/min) f(mm/rev) V(m/min) f(mm/rev) V(m/min) f(mm/rev) V(m/min) f(mm/rev)
5 60-120 0.12-0.25 50-100 0.1-0.20 30-60 0.08-0.15 60-120 0.15-0.30 40-80 0.15-0.25
6 60-120 0.14-0.25 50-100 0.14-0.25 30-60 0.10-0.18 60-120 0.14-0.25 40-80 0.14-0.25
7-8 60-120 0.16-0.30 50-100 0.16-0.30 30-60 0.10-0.20 60-120 0.16-0.30 40-80 0.16-0.30
9-10 60-120 0.16-0.30 50-100 0.10-0.20 30-60 0.08-0.115 60-120 0.20-0.35 40-80 0.20-0.35

General Recommendations

• It is mostly recommended to use an external coolant jet at • See pages 590-591 for troubleshooting guide
a minimum pressure of 10 to15 bar during drilling for common problems.
for prolonged tool life and to facilitate chip evacuation. • Solid carbide drills can be used on a wide range of
• When machining alloy and stainless steel, it is mostly materials and different cutting conditions with high
recommended to use ER JET 2 collet to prolong tool life reliability and performance repeatability.
and prevent built-up edge. This can reduce tool inventory and logistic costs.
• Semi-synthetic or emulsion lubricants should
be used to extend tool life. 3 Flute Solid Carbide Drills
• Drilling stainless steel or high temperature alloys requires Three flute drills are used extensively on nonferrous metals
high oil pressure and 7-15% mineral or vegetable based because of their excellent performance on these materials.
These solid carbide drills were designed with a special
oil emulsion for prolonged tool life. Dry machining may
badly affect hole quality and drill tool life. cutting edge geometry that can be used on a broad
• In case of chip evacuation problems or when poor spectrum of materials including steel, stainless steel, high
surface finish is obtained, it is most recommended temperature alloys, cast iron and nonferrous materials.
Their dimensions are according to DIN 6537 standard.
to use pecking cycle.
• For optimal performance, it is recommended to use the The SCCD drills are manufactured in m7 diameter
3 flute, 5xD solid carbide drills in rotating or stationary tolerance, with cylindrical shanks according to DIN 6535
applications with a maximum of 0.02 mm runout. HA standard, 30° spiral flute helix, 150° head point angle
and a reinforced web taper.
Larger runout will reduce drill performance and badly
affect hole quality. The drills can be used on surface applications
• The solid drills can be clamped into any of ISCAR’s of up to 20° sloped entry/exit. (In this case, the
tooling systems such as: drill should be held in a thermal shrink collet or a
1. Collet chucks MAXIN power chuck). The 3 flute solid carbide
2. Thermal shrink chucks drills cannot be used on radial drill adjustment
diameter devices such as our FITBORE adapter.
3. ISCAR MAXIN power chucks
• It is recommended to use the solid drills in SHORTIN
adapters with AA super precision collets to obtain a
high level of hole quality and prolonged drill tool life. 20º max
Balanceable adapters should be used for applications
above 10,000 RPM in order to minimize vibrations and
gain a reliable and prolonged cutting edge life.
• Interrupted cut applications reduce hole accuracy, Followed by a CHAMDRILL
quality and drill life. 3 Flute Centering Drill SUMOCHAM/CHAMGUN

Advantages
The drills provide higher hole cylindricity, roundness,
straightness, concentricity and surface finish when
compared to 2 flute solid carbide drills.
The 3 flute solid carbide drills with a 150˚ point
head can serve as centering drills for CHAMDRILL/ 150º 140°
SUMOCHAM or CHAMGUN if necessary.

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