Каталог Dormer Pramet фрезерование 2021 - 2022 - страница 777

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Milling using Circular or Helical Interpolation

This method is analogous to ramping, except it is performedface of the tool and may potentially destroy the tool completely.
along a circular path. In this case, one of the most important fac-On the other hand, if the diameter of the milling cutter is too small,
tors is the milling cutter diameter or minimum and maximum di-the core will remain inside the hole axis and must then be milled off
ameter of the hole we are able to machine with the given millingseparately.

cutter type (this information is vital only when using milling cut- ters without central cutting edges). If the milling cutter diameter is too large, the path of the insert will not pass through the axis of the hole, resulting in a protrusion which will collide with the

DCdDCdd
1DC1

1

DC = cca 0,5 × d DC > 0,5 × d DC < 0,5 × d

1 1 1

D– Hole diameter
max
DC – Milling cutter diameter
INSD – Insert diameter
RE– Insert corner radius
BS– WIPER edge length
b– Max. a for grooving

e Maximum hole diameter For blind holes, you can achieve a flat bottom by having the tool pass over the bottom's centre.

For through hole:For through hole:
Dmax = 2 . DCDmax = 2 . DC

Minimum hole diameter

For through hole:For through hole:
Dmin = (DC - b) . 2Dmin = (DC - 0.8 INSD) . 2
For flat bottom:For flat bottom:
Dmin = (DC - (RE + BS)) . 2Dmin = (DC - 0.5 INSD) . 2

Recommendations include tables listing the minimum hole diameter, maximum hole diameter and in-axis descent angle values for these diameters (in some cases there will be two tables: one for standard insert geometry and another for HFC).