·370·
Operating manual
CNC 8070
20.
SETUP ASSISTANCE
(REF: 1505)
The circularity (roundness) test
20.3.3 Configuring and executing the circularity (roundness) test
The process consists in executing a circle with the axes of the machine and verifying it on
its graphic representation. The graphic shows the difference between the actual (real)
coordinate obtained from the feedback device and the theoretical coordinate calculated in
that point. This difference is shown projected radially.
The interpolation of the machine axes and the point capture for the graphics are initiated
separately. The data capture is handled from the softkey menu whereas the movement of
the axes is controlled from the operator panel.
The adjustment process is repeated until obtaining the best adjustment of the axes. The
circularity (roundness) test diagram is an assistance tool that only shows the response of
the system to the various settings (adjustments); it is up to the technician to choose the best
adjustment.
How to execute the circularity (roundness) test
Basically it is done as follows. Each of these points is described in more detail in the indicated
chapter. The configuration used may be saved in a file for later.
1 Before initiating the process, certain aspects must be configured as well as the graphic
environment, the circular interpolation, the values of the parameters involved, etc. A
previously saved configuration may be used. See "20.3.3 Configuring and executing the
circularity (roundness) test" on page 370.
2 Execute a circular interpolation of the machine axes. The axes must be moving before
the data capture starts. See "20.3.5 Define and execute the movement subroutine" on
page 372.
3 Initiate the data capture and the graphic simulation. Once the axes are moving, the data
capture for the graphics may begin. While capturing data, the position error at each point
is drawn on the graphics. See "20.3.6 Data capture for the graphic" on page 373.
4 Optimize the adjustment by changing some machine parameters of the CNC or of the
drive. This makes it possible to evaluate the system response to these changes and
optimize the adjustment. See "20.3.7 Adjustment of the machine parameters involved"
on page 374.
5 Save the modified values and the configuration used. See "20.3.8 Validate the changes
and save the configuration used" on page 376.
Move through the data
To enter or modify a data, it must be selected; i.e. it must have the editing focus on it. To select
a data, use the [][]
[][] keys.
The data are accepted with the [ENTER] key. Before accepting a data, it is checked out and
if the data is not correct, it is not accepted.
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