Circularity Test: Performing The Measurement - Siemens SINUMERIK 840D sl Commissioning Manual

Result
The best contour results are achieved when the circular form test results are in the correct
actual size, shape and minimum p/p deviation between a combined interpolation of the axes (X-
Y, X-Z, Y-Z).
An NC program in the MDA operating mode and the circularity test function are used to
measure and evaluate these results. The "worst case" of a circle radius and the path velocity
must lead to a realistic radial acceleration of which the machine is capable.
Circularity tests of machine manufacturers usually use a radius of 100 mm or 150 mm with
feedrate speeds that are determined by the machine manufacturer. The machine manufacturer
determines the specifications for an acceptable result.
High-speed processes generally have higher requirements for testing circles with high-speed
milling machines and can range from circle radii of 10 - 25 mm and feedrates of 5 - 10 m/min.
For high-speed milling machines, the results are generally acceptable if the P/P deviation
≤ 0.010 mm and the actual size of the circle is equal to the programmed radius – or in the worst-
case scenario – to the path velocity.
10.7.2

Circularity test: Performing the measurement

Setting parameters
Figure 10-8
CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA
Circularity test - measurement
Drive tuning
10.7 Circularity test
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