Traori 5-Axis Transformation; Basics Of Simultaneous 5-Axis Machining - Siemens SINUMERIK 828D Manual

Important functions for 3- to 5-axis machining
3.5

TRAORI 5-axis transformation

Inclined planes can be machined with the aid of CYCLE800. The tool is inclined relative to the
workpieces so that inclined workspaces can be machined. The inclination is performed at the
start of the machining and is not changed during the machining of the inclined plane. However, in
many case this static inclined position is not sufficient. A constantly changing tool orientation
relative to the workpiece is required. So that this can be performed in a clear and user-friendly
way, the 5-axis transformation, which is activated by the TRAORI command, has been
introduced.

3.5.1 Basics of simultaneous 5-axis machining

The various kinematics of 5-axis machines were described in Section 1.5. A distinction is made
between three basic types.
Machines with a rotatable tool which is swiveled by means of two rotary axes.
Machines with a rotatable workpiece which is swiveled while the orientation of the tool
remains fixed in space.
Machines of the "mixed" type on which one rotary axis rotates the tool and the second rotary
axis swivels the workpiece.
Machine kinematics and machine movement
Motion sequence for head/head kinematics
A semicircle must be described in the X/Y
plane for one cycle. At the same time, the tool
must be rotated through 180° around Z if the
tool is always to be perpendicular to the
surface. Therefore, for the machining of one
cycle, 3 axes, X, Y and C must move.
It is clear from the example that totally different machine movements produce the same
machining result. If we look at the movements more exactly, we can see that in both cases the
movement of the tool tip on the workpiece and the tool orientation relative to the surface are
identical.
© Siemens AG All rights reserved SINUMERIK, Manual, Mold-Making with 3- to 5-Axis Simultaneous Milling
Motion sequence for table/table kinematics
At the start, the A axis must be rotated through
90°. The tool is then perpendicular to the
surface. For one cycle, the C axis swivels from
+90° to -90°. Therefore, for one cycle (a
semicircle), only the C axis moves.
3.5
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