Try this self-administered test of your knowledge of Temperature Compensation (just 12 questions). It's OK, no-one gets to know how you score unless you tell them!

Over the typical maximum range of temperatures experienced on the shop floor (say, 50° F to 140° F, or 10° C to 60° C) Coefficients of Expansion (COE) for the most commonly machined metals are practically linear. However, COEs are typically expressed in handbooks only to within +/- 10% or so, because of uncertainties. Can you associate the following approximate COEs (expressed in parts per million per ° F or "ppm/°F") with their respective metals?

1) The approximate COE of Steel is:

1. 12.2 ppm/°F
2. 6.5 ppm/°F
3. 10.0 ppm/°F
4. 5.5 ppm/°F
   

Your answer # 1: select a b c d
Correct answer:   show b

2) The approximate COE of Aluminum is:

1. 12.2 ppm/°F
2. 6.5 ppm/°F
3. 10.0 ppm/°F
4. 5.5 ppm/°F

Your answer # 2: select a b c d
Correct answer:   show a

 

 

3) The approximate COE of powdered metals is:

1. 12.2 ppm/°F
2. 6.5 ppm/°F
3. 10.0 ppm/°F
4. 5.5 ppm/°F
   

Your answer # 3: select a b c d
Correct answer:   show c

 

4) What is the standard international reference temperature at which all measurements are specified, as stipulated by ISO and ANSI?

1. 32° F (0° C)
2. 50° F (10° C)
3. 68° F (20° C)
4. 86° F (30° C)

Your answer # 4: select a b c d
Correct answer:   show c

 

 

5) What is the difference between an "accurate" and a "precise" gaging system?

1. a precise gage has greater resolution than an accurate gage
2. a precise gage has better R & R than an accurate gage
3. there is no difference
4. an accurate gage gives results which are closest to true dimension, while a precise gage is repeatable, even if inaccurate.

 

Your answer # 5: select a b c d
Correct answer:   show d

 

 

6) Which "elements" of a measurement system (gage) can contribute to temperature induced error? A good example of such a system can be found here.

1. workpiece
2. gage fixture
3. setting master
4. all of the above

Your answer # 6: select a b c d
Correct answer:   show d

 

 

7) How large a dimensional variation will be observed in a three (3) inch (76 mm) aluminum component as a result of it changing temperature by 20° F / 11° C, say from 65° F / 18° C to 85° F / 29° C? - Calculators allowed. (Clue: coefficient of expansion for aluminum is the answer to question 3.) A good example of such a part is an auto engine piston. See our Application Note on temperature compensating piston gages.

1. .0004 in / 0.010 mm
2. .0006 in / 0.015 mm
3. .0008 in / 0.020 mm
4. .0010 in / 0.025 mm

Your answer # 7: select a b c d
Correct answer:   show c

 

 

8) How large a dimensional variation will be observed in a three (3) inch (76 mm) steel component as a result of it changing temperature by 20° F / 11° C, from 65° F / 18° C to 85° F / 29° C? - Calculators allowed. . (Clue: coefficient of expansion for steel is the answer to question 2.)

1. .0002 in / 0.005 mm
2. .0003 in / 0.0075 mm
3. .0004 in / 0.010 mm
4. .0006 in / 0.015 mm

Your answer # 8: select a b c d
Correct answer:   show c

 

 

9) What do the letters "TEI" stand for?

1. Theorized Expansion Indicator - an estimate of thermal expansion coefficient
2. Thermal Error Index - an ANSI defined estimate of overall thermal error in a measurement system
3. Temperature Equalization Inversion - the amount of thermal error offset experienced when setting master and gage vary in temperature by the same amount
4. Thermal Energy Input - the amount of thermal energy generated in a part as a result of a production process

Your answer # 9: select a b c d
Correct answer:   show b

 

 

10) What is a Full Electronic Temperature Compensation System? Albion's TComp II system is just one of our systems in this category.

1. A system of temperature sensors and an electronic controller which senses temperatures of master, workpiece and gage fixture during measuring operations and generates a real-time net correction for thermal errors
2. A sensor and electronic interface which senses the temperature of parts while they are being measured
3. A method by which temperature is controlled at nominal temperature
4. An off line computer into which an operator punches temperatures and dimensions in order to calculate thermal errors

Your answer # 10: select a b c d
Correct answer:__ show a

 

 

11) Approximately how much of the thermal error in a measurement should an Electronic Temperature Compensation System consistently eliminate?

1. 80% or better
2. 92% or better
3. 65% or better
4. 50% or better

Your answer # 11: select a b c d
Correct answer:__ show b

 

 

12) What is the principal benefit of a Temperature Compensation System?

1. Measurements are always given at reference temperature, regardless of actual temperatures
2. The system constantly displays the temperatures of workpiece and gage during measuring operations
3. A cheaper coolant can be used in metal cutting processes
4. Machine operators can take the afternoon off

 

Your answer # 12: select a b c d
Correct answer:__ show a

 Request Info