Tips & tricks - Alfra

B
■ Core Drills machine only a fraction of the material at the same bore
diameter than a twist drill
■ The remaining core is ejected after finishing the drilling process.
■ Thereby minor power and feed pressures are required.
■ When using twist drills, it is possibly required to pre-drill. This is
entirely omitted when using core drills, you can directly drill with the
requested diameter.
The primary drilling time is abbreviated considerably depending on the
cutting diameter.
B/130
The Core Drilling Principle
Economies on chipping
volume of a core drill
compared with a twist drill
64% saving
75% saving
81% saving
85% saving