www.lionprecision.com/two-year-warranty/
Document No. M017-7500.004
38
Oakdale, MN, USA www.lionprecision.com 651-484-6544
Roundness
Related Standards:
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Turning: ISO 230-7, 5.5; ASME B5.57, 7.5.3
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Milling: ISO 230-7, 5.4; ASME B5.54, 7.5.3; ASME B5.57, 7.6.4
Description:
Roundness Capability describes the ability of the machine to create round features when drilling
or boring with a milling type spindle, or any radial cutting on a lathe type spindle. The
measurement of Roundness Capability is an accurate prediction of the roundness of features
formed in this way. It does not apply to round features created by moving the workpiece/spindle
in a circle on a mill.
Roundness Capability is only measured on the Radial axis. The calculation of the Radial axis
measurement depends on whether it is a turning spindle or milling spindle. If a milling spindle,
the Radial axis is a mathematical combination the X and Y axes which the standards call
“rotating sensitive direction.” If a turning spindle, the Radial axis is the X axis which the
standards call “fixed sensitive direction.”
The Radial result is the average of the values at each speed. Because there is only one axis
measured for Roundness Capability (the radial axis), the Combined Roundness Capability for the
machine is equal to the Radial axis measurement.
Purpose:
As an accurate predictor, the Roundness Capability value can be used to determine a machine’s
ability to reliably produce part features with a specified roundness.
