Albion Devices,Inc (858-792-9585) has a long and proud record of doing business with the Railroad industry. In this brief presentation, you will learn how our leadership in temperature compensation can assist you in precision dimensional measurements of railroad wheel sets. Subscribe for more information at www.TemperatureCompensation.com

1. Temperature Compensation
and railroad wheelset precision
dimensional measurements
by Albion Devices, Inc
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2. Albion - the leader in temp comp
• Railroad wheelsets include
some components that have
tight tolerances. For example,
the AAR requires that axle
journals and bearing races
(cones) are finished to
dimensions measured in tenths
of thousands of an inch.
• It can be hard to hold these
tolerances consistently in
changing temperatures.
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3. Albion - the leader in temp comp
• Most railcar axle journals
and bearings are
approximately 5 to 7 inches
in diameter.
• Over a temperature range of
40ºF to 140ºF (4ºC to 60ºC)
their diameters will change
by .0050 to .0070 inch
(0.13mm to 0.18mm).
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4. Albion - the leader in temp comp
• Maximum tolerance is usually no more than +/-
.0005 inch (+/- 0.013mm).
• Albion’s gages repeatably correct all measurements
to the International Reference Temperature of 68ºF
(20ºC) to within +/- .0002 inch (+/- 0.005mm) over a
temperature range of 40ºF to 140ºF (4ºC to 60ºC)
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5. Albion - the leader in temp comp
• Albion Devices, Inc., is the
world leader in temperature
compensation of precision
dimensional measurements.
• All metals expand and contract as temperatures
vary. By eliminating these effects from
precision measurements, our gages provide
repeatable and reproducible measurements year
round in all climates and working conditions.
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6. An Introduction to TComp
• Albion Devices, Inc., developed
TComp (“tee-comp”) temperature
compensated snap gages and bearing
cone gages specifically for the railroad
industry and in consultation with key
AAR officals. The unique, built-in
temperature compensation capabilities
of these units make them the most
consistently accurate shop floor snap
gages and bearing gages available.
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7. TComp digital indicator.
• The TComp digital indicator lies at the heart of our
railroad gages. It is a small, battery or mains powered,
micoprocessor-based system that is designed to fit on a
custom snap gage frame or other gage fixture so as to take
temperature compensated comparative measurements.

8. Snap Gage configuration
• Mounted on a manually operated snap gage, TComp
can produce accurate and repeatable measurements to
within + / - .0002 inch (5 microns) or better, over a
temperature range of 40ºF to 140ºF (5ºC to 60ºC).

9. Stack gage
• Dual TComps can be
mounted into a
specially designed
bearing cup gage,
called a “stack
gage”, used
extensively in the
railroad industry.

10. Fixture mounted applications
• Mounted in a fixture or a
stand, TComp is capable of
accurate and repeatable
measurements to within + / -
.0001 inch (2.5 microns) or
better, over a temperature
range of 40ºF to 140ºF (5ºC
to 60ºC) on the shop floor.
• Tcomp can also be mounted
on a bar gage for critical
large diameters.

11. Tcomp’s transducers
• TComp indicator is equipped Gage
with a transducer assembly sensor
that contains 3 sensors: an
LVDT, a workpiece/master LVDT
temperature sensor (that
senses through the carbide
face of the measuring anvil)
and a gage fixture temperature
sensor (that monitors the
temperature of the frame or Workpiece
sensor
fixture in which it is mounted).

12. Controls
• TComp is
programmed and
operated through a
simple touch pad on
the front panel.
• An LCD displays data
and measurements.

13. Transducers
• LVDT probe and temperature
sensors are mounted within the
gage fixture so as to make
suitable contact with respective
components.
• The “Gage” sensor monitors the
temperature of the snap gage
frame. The “Workpiece” sensor
senses the temperature of the
workpiece and the master.

14. Operation
• In operation, TComp notes the
temperature of the master during the
mastering (zeroing) cycle, then
switches automatically into
Measure Mode. In this mode it
assumes that it is measuring a
workpiece and applies the
respective correction coefficient.
Meanwhile, the gage sensor applies
yet another coefficient to any
changes in gage fixture or frame
temperature.

15. Compensation Algorithm
• TComp’s programmed
algorithm takes into
account any variation in Workpiece Master Gage
the temperatures of the Temperature Temperature Temperature
workpiece, master or Workpiece Master Gage
gage fixture (the Coefficient Coefficient Coefficient
“elements” of the
measurement system) Compensation Temperature
Algorithm Corrected
from Nominal Dimension
Temperature (usually
68°F/20°C).

16. Algorithm (cont)
• TComp applies these variations to user-programmable
correction coefficients (expansion coefficients) and to
the user programmable nominal dimension (since
coefficients are expressed in terms of size variation
(inch or MM) per degree of temperature (°F or °C) per
unit of dimension (inch or MM)).

17. Correction to 68°F/20°C
• The net size variation after allowing for expansion
or contraction in all 3 elements is applied in real
time to dimensional measurements made by
TComp’s LVDT.
• The result is that all displayed dimensions show
the size that the workpiece would measure if it, the
master and the gage frame were all at Nominal
Temperature (68°F/20°C).

18. Temperature sensing
• The key to the success of
TComp’s system is in accurate
and rapid temperature sensing.
• This is accomplished by using
stable and accurate electronic
chip and thermistor technology
housed in protective housings
within the gage.

19. The Dramatic Potential
Temperature Compensation of precision
gaging provides dramatic improvement in:
• Process control
• Gage repeatability
• Gage correlation
• Scrap and rework reduction
• Overall quality control

20. Product Range
• The remarkable
thermal correction
capabilities of TComp
can be applied to a
wide range of gages.
Be sure to ask us
about our other
temperature
compensated gages
and systems.

21. Thank you for viewing this introduction to TComp. We hope that
you found it useful and informative.
Albion Devices, Inc.
742 Genevieve Street, Suite L
Solana Beach, CA 92075
858-792-9585
adi@AlbionDevices.com
www.AlbionDevices.com