CMM
Maintenance, Certification and Calibration Services
In order to
achieve the highest accuracy of your system and maximize
its productivity, we
highly recommend that your coordinate measuring
machine should only be serviced by
OEM trained specialists. Our service engineers
are former Leitz™ and Brown & Sharpe®
employees with an unmatched
level of OEM training. All our calibration & certification
services include a comprehensive maintenance.
We also offer repair service, when
needed, to meet the OEM specifications. Maintenance
contracts are also available.
____________________________________________________________________
All
Calibrations/Certifications of your Company's CMM Include:
Calibrations performed to OEM and ISO
10360 and VDI/VDE 2617 specifications.
Report (40+ pages) on work performed, incl. before &
after correction results
Calibrations/Certifications performed in accordance
with industry standards
NIST traceable calibration/confirmation certificate
- CMM lab and temperature sensor accuracy check
- Probehead performance, reliability and repeatability
test
- Angular and straightness error corrections,
if required
- Linear accuracy checks and corrections in X,
Y and Z axis
- Squareness checks and corrections in XY, XZ
and YZ
- Volumetric (3 dimensional) measurements in 4
spatial positions
Reference artifacts are traceable
to the National Institute of Standards and Technology
- NIST ______________________________________________________________________________________________
CMM Calibration Examples
Example - Before Correction:
Measured on 1000mm KOBA step gage, steps measured at 40mm
increments.
Range between upper and lower green Lines indicates maximum
OEM allowed tolerance range (in microns),
center line indicates absolute 0 deviation. Maximum allowed tolerance
range is 0.9+L/500 (+/- 2.9 microns at
distance of 1000mm). Red dots show the measured positions on the step gage,
points lie within +1.5 microns
and -1.2 microns, some of the measured positions exceed
the maximum allowed tolerance.
Example - After Correction:
Verified on 1000mm step gage now at 20mm increments to
include possible
Probehead offset error. All points lie within +0.30 microns
and -0.15 microns. Our service engineer was
able to adjust the CMM geometry to utilize less than
25% of the maximum OEM allowed tolerance.
Example – Spatial Measurement:
This is an example that shows the results of 1 of the
4 spatial measurements.
Volumetric measurements in the 4 spatial positions combine
all 21 possible accuracy deviations your CMM, such as
linear, angularity, pitch, yaw, roll and straightness
deviations. These last 4 spatial measurements will only
indicate
the combined errors of all these deviations, they can
not be adjusted by the service engineer anymore.
The allowed OEM tolerance in this example is 1.2+L/400
(+/ - 3.7 microns at distance of 1000mm).
All measured positions lie within +0.55 microns and
-0.80 microns.
Our service engineer adjusted the entire CMM geometry
to be within less than 35% of the max. allowed tolerance.
Please feel free to compare
our results to the latest calibration report of your
current service provider.
Preventive
Maintenance of Your System Includes:
Mechanics
- Check CMM and air bearing ways for damage
- Check airbearing pressures and test for proper
functionality
- Check air supply, filters and damping system
- Check, lubricate drive systems and correct tension
on each drive
- Check scales and correct gaps between scale and
encoder
Electronics
- Adjust/optimize Probehead electronics and signals
- Adjust/optimize encoder system for each axis
- Check and adjust voltage supplies to appropriate levels
- Adjust X, Y and Z motor speeds and monitoring circuitry
The
maintenance steps above are a subset of our complete procedure
2002-2007 Exact Calibration Inc. All rights
reserved. Exact Calibration is NOT an affiliate of the
Hexagon Metrology™ Group.
Brown&Sharpe, Leitz, DEA, KOBA and Wyler names and logos
are trademarks or registered trademarks of their respective
holders.
