Page 309 - ISCAR(HOLE_MAKING_CATALOG_65)

USER GUIDE

Typical Gundrill Applications - Typical Gundrill Applications - GUNDRILLS
Main Drilling Methods Chip Evacuation and Coolant Flow

Guide Barrel

Figure 1
Figure 3
Pre-Drilled Guide Hole Boring with chip evacuation and coolant
flowing opposite the boring direction

Figure 2
User Guide
The gundrill is not a self-centering tool. Therefore, 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 Figure 4
with a means for guiding the gundrill, preferably during the entire Drilling of solid material with chip evacuation and
drilling process. coolant flow opposite the drilling direction
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.
The guide pads contribute to the high degree of
calibration and provide burnishing of the drilled hole.

Figure 5
Boring with chip evacuation in the boring direction

Figure 6
Boring with a staged tool chip evacuation and
coolant flow in the boring direction

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