Page 667 - Iscar

USER GUIDE
GUNDRILLS

Standard Gundrill Head Profiles

Drilling capacity and finish of the drilled hole are tool is manufactured. Although regrinding may change the
dependent on the geometrical shape of the drill head. cutting geometry, the profile should remain
Both the profile and the sharpening must be matched to the same.
the workpiece material. The profile is defined when the

General Sketch Profile G (Universal) Profile A
Standard form for most material Suitable for cast iron (usually coated)
All cross section profile types, particularly for materials with a and aluminum alloys. Can be used
parameters such as: P, tendency to shrink. Recommended for cross drilling, angular entry or
La and must be precisely for high precision bore tolerance exit and for interrupted cut. Large
matched to the workpiece and straightness. Maintains precise coolant gaps between pads.
material properties. exit hole size. Recommended when
extra burnishing is required.

P
ØD
La

α

Profile B Profile C Profile D
Excellent size control, for high Used for angled entry or exit. Suitable for cast iron only.
precision hole tolerance. Used for Large back taper, for shrinking Very effective in grey cast
cast iron and aluminum alloys. materials such as types of iron (usually coated).
alloys and stainless steel. Large
coolant gaps between pads.

Profile E Profile H Profile I
General use, for alloys and stainless Recommended for all Used for aluminum and brass for
steel. This profile eliminates the nonferrous and cast iron best hole finish. For intersecting
problem of the tool sticking in materials up 5 mm diameter. holes and interrupted cut or when
the hole after the outer corner Sometimes used for wood and extra outer diameter support
dulls. Especially suitable for plastic with larger back taper. and burnishing is required.
crankshaft and other forged
materials. Recommended for
accurate hole straightness.

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