5-Axis Simultaneous Or 3+2-Axes - Siemens SINUMERIK 828D Manual

7.1
3+2-axis machining
5-axis simultaneous
machining
152
Difference between 3, 3+2 and 5 axes
7.1

5-axis simultaneous or 3+2-axes

In this chapter, you will learn more about the differences when milling with 3 or 5 axes. The cost-
effectiveness must always be taken into account for 5-axis machining? This means that the
following procedure is recommended for the production, if permitted by the workpiece geometry
and the machine kinematics:
As much as possible 3-, 3+1- and 3+2-axis (set at an angle) roughing/semi-finishing
5-axis simultaneous milling only for the finishing
The advantages and disadvantages of the 3+2-axis and the 5-axis simultaneous machining are
briefly compared in the following tables.
3+2-axis semi-finishing set at an angle
Advantages
Less programming work
No limitation of the dynamic response as
only linear axes are used
Greater stiffness of the moving axes with
3+2-axis machining (depending on the
machine concept). As a result, longer tool
life and higher surface quality
Advantages
Deep cavities and undercuts can be
machined in one clamping operation
Shorter tools with compact clamping
More uniform surfaces - no transitions
No special tools necessary
© Siemens AG All rights reserved SINUMERIK, Manual, Mold-Making with 3- to 5-Axis Simultaneous Milling
5-axis simultaneous finishing
Disadvantages
Limitation of the workpiece geometry,
e.g. undercut cavities
Longer tools may be required
Several setting positions (3+2-axis)
required, possibly longer machine times
and visible machining transitions
Disadvantages
More programming work
Higher risk of collision
Frequently longer machining times due to
compensatory movements of the
kinematics
Tolerances of the kinematics can add up
because more axes are being used