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Questions and Answers
What is the primary function of a Vernier Caliper?
What is the minimum measurement that can be taken with a Vernier Caliper?
What is the purpose of a dial gauge attached to a Vernier Caliper?
What is the name of the tool used to measure small distances such as clearance between two parts?
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What is the main advantage of using a Vernier Caliper over a Micrometer?
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What is the name of the part of the Vernier Caliper used to measure the depth of an object?
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What is the purpose of a Thickness Gauge?
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What is the unit of measurement that can be read on a Vernier Caliper?
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What is the purpose of the classification on the dial face of the gauge?
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What is the first step in taking a measurement with a dial indicator?
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Why is it important to turn the dial face during measurement?
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What should you do to ensure the accuracy of measurement with a dial indicator?
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How should the legs of the vernier caliper be aligned with the object to be measured?
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What should you do to the objects to be measured with a vernier caliper?
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What is the purpose of the lock screw on a vernier caliper?
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Why is it important to check the accuracy of a vernier caliper?
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What type of tachometer is suitable for distributorless ignition systems?
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What is the main purpose of a timing light?
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How do digital tachometers measure engine speed?
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What is the function of a spark tester?
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What type of tachometer clamps over the number 1 spark plug wire?
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What is displayed on the LED display of some timing lights?
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What is the main difference between a spark tester and a spark plug?
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What is the purpose of the Vernier scale in a micrometer?
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How do inductive pickup tachometers work?
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How do you determine the value of the additional digits on the Vernier scale?
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What is the purpose of the ratchet speeder in a micrometer?
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What do you need to ensure when adding the main scale and Vernier scale readings together?
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What is the purpose of the anvil in a micrometer?
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What is the correct order of steps when using a micrometer?
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What is the final measurement if the main scale reads 2.6 inches and the Vernier scale reads 0.014 inches?
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Why is it important to ensure the units are the same when adding the main scale and Vernier scale readings together?
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What is the main purpose of an annual report?
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What is the first step in developing records and documents?
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What is the last step in the problem reporting procedure?
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What is the purpose of a standardized, consistent format in developing records and documents?
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What is the main purpose of evaluating the relevance, efficiency, effectiveness, impact, and sustainability of a project/program?
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What is the benefit of using bullet points and flow diagrams in developing records and documents?
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What is the importance of clarity in developing records and documents?
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What is the purpose of preparing reports?
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Study Notes
Digital Reading Tape Measure
- Used for large straight line measurements
Vernier Caliper
- A sliding measuring device that can make inside, outside, and depth measurements with considerable accuracy
- Can take measurements as small as 0.001" (0.025 mm)
- May have a dial gauge attached, which makes the "thousandths" part of a measurement easier to read
- Can take inside, outside, and depth measurements to within hundredths or thousandths of a millimeter or thousandths of an inch
- Parts include:
- Inside diameter measuring jaws
- Outside diameter measuring jaws
- Stop screw
- Vernier scale
- Main scale
- Depth rod measurement
- Depth rod
Thickness Gauges
- Also known as "feeler" gauges
- Used to measure small distances, such as clearance between two parts
- Example: checking the clearance between the rocker arm and valve stem in an engine
Tachometers
- Used to measure engine speed
- Available in analog and digital types
- Digital meters are the most common
- Can be connected to the ignition system to monitor ignition pulses, which are then converted to engine speed
- Inductive pickup tachometers simplify rpm testing and can be used for distributorless ignition systems
Timing Light Analyzer
- Used to check ignition timing
- Connected to the battery terminals and has an inductive clamp that fits over the number 1 spark plug wire
- Emits a beam of light each time the spark plug fires
- Some timing lights have a timing advance knob that can be used to check spark advance
- Can electronically measure timing advance as the engine rpm is increased and display it on an LED display
Spark Tester
- A fake spark plug used to determine if the ignition problem is caused by something in the primary or secondary circuit
- Constructed like a spark plug but without a ground electrode
- Has a grounding clamp instead of an electrode
- Inserted into the spark plug end of an ignition cable
Dial Indicator
- Used to measure small distances
- Has a dial face with a classification and measuring range
- Has a counter that indicates the number of turns the pointer is turned by
- How to read dial indicators:
- Make certain that the best mounting attachment and a suitable contact point are selected
- Ensure the dial indicator and base are firmly attached and the measuring rod is parallel to the object being measured
- Check that the rod, spindle, and dial needle move freely and the dial range is adjusted to measure the full movement of the object
- Turn the dial face so that the zero line is placed over the dial needle
- Take at least two readings and move or turn the object against its stop or end of travel to ensure accuracy
Checking and Adjusting Measuring/Testing Devices
- How to adjust vernier caliper:
- Clean the legs and check the tool for accuracy
- Clean the objects to be measured and slide the movable leg close to the surface
- Lock the leg with the lock screw to the bar
- Be certain that the legs are parallel to the object to be measured and do not force the legs together
- Adjust the leg with adequate force so that the object just sits between the two legs
- Find the first mark on the Vernier scale that lines up perfectly with any line on the main scale
- Add the main scale and Vernier scale results together to get the final answer
- Using a micrometer:
- Position the object to be measured on the anvil
- Clamp the object between the anvil and spindle
- Rotate the thimble using the ratchet speeder until the spindle is close to the object
- Carefully turn the ratchet as you approach the surface to be measured and continue until the spindle stops rotating
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Description
This quiz covers the uses and measurements of digital reading tape measures and Vernier Calipers, including their accuracy and applications.