Operation
Version 1.0.2 - 2020-07-06
35
Translation of original instruction
DH 40CT | DH 40CTP
EN
D
H
4
0
CT_DH40CTP_G
B_4
.f
m
The machine tap turns into the workpiece. As soon as the preset depth is attained, the spindle
reverses the direction of rotation at the switch point. The machine tap turns out of the work-
piece. When the sleeve is completely entered up to the switch point the rotation of the spindle is
stopped. Then it is possible to proceed another threading operation.
ATTENTION!
Before proceeding another threading cycle, the sleeve must be completely entered in order to
trigger the switch point.
The selector switch automatic spindle sleeve feed must be in the "OFF" position.
4.14
Clamping the workpieces
CAUTION!
Injuries can be caused by parts flying off.
The workpiece must always be secured to the milling table in a machine vice, chuck or
with another suitable clamping tool, such as a workholding device (clamping claws).
4.14.1 Calculation of the Cutting Forces or Necessary Holding Force when Milling
The cutting force Fc arising between the tool and workpiece when milling can be calculated
using the Viktor/Kienzle formula:
In this formula, there are 5 factors which are completely unknown without more detailed knowl-
edge. However, these factors can be determined using tables.
The specific cutting force
kc1.1
and the chip thickness exponent
mc
are dependent on the
material used. Both parameters are present in tabular reference books and must be investi-
gated for the corresponding material.
Furthermore, for the calculation of the cutting force
Fc
according to the Kienzle equation, the
chip width
b
, the chip thickness
h
, and the correction factor
K
are needed.
We recommend using a book of machining technology reference tables.
In such handbooks you will find all the necessary and additional information. Such manuals
should bridge the gap between the predominantly theory-oriented textbooks and reference and
table books mostly written with the few theoretical principles in practice.
