www.lionprecision.com/two-year-warranty/
Document No. M017-7500.004
29
Oakdale, MN, USA www.lionprecision.com 651-484-6544
At the conclusion of the test, the total range (maximum – minimum) for each axis is calculated
and presented as Total Drift per Axis.
The Combined Drift for the machine is the square root of the sum of squares of the individual
Total Drift values. To generate a single Combined Drift value for the machine: X² + Y² + Z².
Note that the Combined value is always larger than any individual value.
Purpose:
When a cold spindle begins to rotate, friction-heating of the bearings causes the spindle to
expand, primarily in the Z axis. Knowing the time until a machine stabilizes allows for more
precise scheduling/planning of machine time, less scrap, and may reveal unexpected machine-
frame distortions and problems with thermal compensation or problems with spindle chiller
settings
Vibration
Related Standards:
ISO 230-3, 6
▪
ISO 230-7, 5.3;
▪
ASME B5.54, 5.57, 6.3
Process:
1. Select a time duration for the vibration test 1-10 minutes (standards require 10 minutes)
2. Spindle must not be turning
3. Start the test
4. Note any unusual disturbances correlating to spikes in the vibration measurement (forklifts,
CNC punches etc.)
