Page 177 - ISCAR(HOLE_MAKING_CATALOG_65)

USER GUIDE

General Recommendations

• It is mostly recommended to use an external coolant jet 3 Flute Solid Carbide Drills
at a minimum pressure of 10 to15 bar during drilling Three flute drills are used extensively on nonferrous metals
for prolonged tool life and to facilitate chip evacuation. because of their excellent performance on these materials.
• When machining alloy and stainless steel, it is These solid carbide drills were designed with a special
mostly recommended to use ER JET 2 collet to cutting edge geometry that can be used on a broad SOLID CARBIDE DRILLS
prolong tool life and prevent built-up edge. spectrum of materials including steel, stainless steel, high
• Semi-synthetic or emulsion lubricants should temperature alloys, cast iron and nonferrous materials.
be used to extend tool life. Their dimensions are according to DIN 6537 standard.
• Drilling stainless steel or high temperature alloys requires The SCCD drills are manufactured in m7 diameter
high oil pressure and 7-15% mineral or vegetable based tolerance, with cylindrical shanks according to DIN 6535
oil emulsion for prolonged tool life. Dry machining HA standard, 30° spiral flute helix, 140° head point angle
may badly affect hole quality and drill tool life. and a reinforced web taper.
• In case of chip evacuation problems or when poor The drills can be used on surface applications of up to 20°
surface finish is obtained, it is most recommended sloped entry/exit. (In this case, the drill should be held in a
to use pecking cycle. thermal shrink collet or a MAXIN power chuck). The 3 flute
• For optimal performance, it is recommended to use the solid carbide drills cannot be used on radial drill adjustment
3 flute, 5xD solid carbide drills in rotating or stationary diameter devices such as our FITBORE adapter.
applications with a maximum of 0.02 mm runout.
Larger runout will reduce drill performance
and badly affect hole quality.
• The solid drills can be clamped into any 20º max
of ISCAR’s tooling systems such as:
1 Collet chucks
2 Thermal shrink chucks
3 ISCAR MAXIN power chucks Followed by a
• It is recommended to use the solid drills in SHORTIN CHAMDRILL
adapters with AA super precision collets to obtain a 3 Flute Centering Drill SUMOCHAM/CHAMGUN
high level of hole quality and prolonged drill tool life.
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,
quality and drill life. 140º 140°
• See pages 179-180 for troubleshooting Advantages
guide for common problems. The drills provide higher hole cylindricity, roundness,
• Solid carbide drills can be used on a wide range straightness, concentricity and surface finish when
of materials and different cutting conditions with compared to 2 flute solid carbide drills.
high reliability and performance repeatability. The 3 flute solid carbide drills with a 140˚ point
This can reduce tool inventory and logistic costs. head can serve as centering drills for CHAMDRILL/
SUMOCHAM or CHAMGUN if necessary.

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