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USER GUIDE
GUNDRILLS Typical Gundrill Applications User Guide

Main Drilling Methods
The gundrill is not a self-centering tool. Therefore
Figure 1
an external means must be used to guide it
to the point of entry into the workpiece.
It is recommended that the machine tool be
equipped with a means for guiding the gundrill,
preferably during the entire drilling process.
An alternative method is a pre-drilled guide hole (figure 2),
which is common for machining centers. Once the drill
has been fully engaged into this hole, it continues to be
self-guided.
Guide Barrel The guide pads contribute to the high degree of
calibration and provide burnishing of the drilled hole.

Figure 2

Pre-Drilled Guide Hole

Typical Gundrill Applications -
Chip Evacuation and Coolant Flow

Figure 3 Figure 4

Boring with chip evacuation and coolant Drilling of solid material with chip evacuation and
flowing opposite the boring direction coolant flow opposite the drilling direction

Figure 5 Figure 6

Boring with chip evacuation in the boring direction Boring with a staged tool
Chip evacuation and coolant flow in the boring direction

670 ISCAR