Каталог Iscar сверла ружейные и для глубокого сверления 2022 - страница 114

When using a gundrill on a lathe machine, a Drill Penetration Instructions short solid carbide centering drill should be

used prior to the gundrill. Once the gundrill 1 Rotate the drill counterclockwise prior

enters the pre-drilled hole, it is self-guided. to and during hole penetration 1 Drilling a pre-hole (drill diameter +0.02 mm)

2 Stop the drill rotation and start the coolant Never try to penetrate the workpiece by using a gundrill

3 Rotate the drill clockwise prior to drilling operation

2 Gundrill penetration through the pre-hole

The influence of a Tool vs. Workpiece rotation

A shallow pre-hole can’t lead the unbalanced gundrill Rotating Rotating tool

Rotating tool workpiece & workpiece

2 x D min

Worst Medium Best

The maximum misalignment between the drill bushing and the workpiece center line should not exceed 0.02 mm (.0008”). Rotating Workpiece

Bushing Stationary Drill

Max. 0.02 mm .0008"