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Quiz

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:
Correct answer:  

 

 

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:
Correct answer:  

 

 

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:
Correct answer:  

 

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:
Correct answer:  

 

 

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:
Correct answer:  

 

 

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:
Correct answer:  

 

 

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:
Correct answer:  

 

 

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:
Correct answer:  

 

 

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:
Correct answer:  

 

 

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:
Correct answer:__

 

 

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:
Correct answer:__

 

 

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:
Correct answer:__

 

 

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