A Different Way Of Thinking For The Y- And Z-Axis Origins; The Y- And Z-Axis Origin Settings When Using The Rotary Axis Unit; Setting The Origins For The Y And Z Axes - Roland MODELA Pro II ZCL-540 User Manual

4-1 A Different Way of Thinking for the Y- and Z-axis Origins

The Y- and Z-axis Origin Settings When Using the Rotary Axis Unit

When you're using the rotary axis unit, the way of thinking behind the settings for the origins is different from thinking behind
three-axis cutting. When you simply use the A axis as an indexing head and only perform cutting from the top surface of the
workpiece, you can accomplish this as an extension of three-axis cutting. However, a different approach is required for two-
surface cutting in which you also rotate the workpiece 180 degrees and cut the bottom surface as well, and for cylindrical
cutting, where you perform cutting while rotating the workpiece. This is because rotating the A axis changes the positional
relationship between the workpiece and the origins, making it impossible to know the reference position for cutting.
In such cases, it is most common to set the Y- and Z-axis origins at the center of the A axis. This chapter describes the origin
settings for such cases.
Machine coordinate origin

Setting the Origins for the Y and Z Axes

To align the Y- and Z-axis origins with the center of the A axis, you first perform detection of the A-axis center using an origin
sensor. This location (the Y coordinate of the A-axis center) is stored in memory in the unit, so you set the Y-axis origin by
calling up the saved value.
Next you set the Z-axis origin. Because this varies according to the length of the tool, you make this setting after first install-
ing the tool. Setting the Z-axis origin is also performed using a sensor.
For more information on the specific method, refer to the following sections.
When making the settings for the Y- and Z-axis origins , check that no cutting waste and the like is present on the origin
sensor and tool. Otherwise, correct measurement may be impossible and the intended cutting results cannot be obtained.
42 Chapter 4 Setting the Origins
User origin
(workpiece coordinate origin)
A-axis center