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35 Cards in this Set
- Front
- Back
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Define measurement |
Using a tool to compare a part to an accepted standard such as a steel rule |
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What are the ranges of steel rules (A) Imperial (B) Metric |
6” - 144” 150mm - 1000mm |
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A 6” steel rule is accurate to _______. |
.003” |
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What are the 3 main types of steel rule? |
Spring tempered Flexible Hook |
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The markings on a steel rule are referred to as _________. |
Graduations |
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What is the discrimination of a measurement tool? |
Smallest possible measure the tool is capable of |
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What is the discrimination of the following? Fractional steel rule Decimal steel rule Metric steel rule |
1/64” .010” .5mm |
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What is a direct reading measurement tool? |
Read the measurement directly from the tool |
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What are the graduations on a #4 standard rule? |
1/8” 1/16” 1/32” 1/64” |
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What are the graduations on a metric steel rule? |
.5 mm 1 mm |
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What is parallax error? |
Error that occurs when the viewers eye is to one side of the graduation being read. |
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What is the main disadvantage of a dial caliper? |
Grit can get into rack and pinion causing it to skip a tooth |
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Why are digital calipers increasingly popular? (4) |
Easy to read Switch between inch and mm Set zero anywhere Resistant to coolant |
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How can an accurate reading be achieved using a vernier caliper? (3) |
Jaws in line with axis being measured Workpiece as close to beam as possible Apply just enough pressure so jaw are in full contact |
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What is the pitch of an OD mic? |
0.025” inch 0.5 mm metric (same as smallest division on main scale) |
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What allows for consistent pressure when closing an OD mic? |
Ratchet stop |
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What is the range of an OD mic? (Inch/metric) |
1” 25 mm |
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List the parts of a vernier caliper. |
Back (Definition) |
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What are the most common ID measuring tools? (3) |
Small hole gauge Telescoping gauge Inside micrometer |
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What type of measuring tool is a caliper? |
Indirect or transfer measurement tool |
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What are the three styles of small hole gauge? |
Twin ball Hardened ball Half ball |
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What type of measurement tools are small hole gauges and telescoping gauges? |
Indirect or transfer measurement tools |
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What are the parts of an OD micrometer? |
Back (Definition) |
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What are two main differences between a depth mic and all other mics? |
Does not tighten against a workpiece Read right to left (not L to R) |
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What sizes of height gauges are available? |
8”, 12”, 18”, 24”, 36” |
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What effect does temperature change have on measurement? |
When material is heated it expands, when it is cooled it contracts. |
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At what temperature should measurements be taken? |
As close to ambient as possible |
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What two ways can a caliper be used? |
1. Adjust caliper to object, then measure the distance 2. Set caliper to known distance and compare to the object |
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What are the different types and styles of calipers? |
Outside / inside Firm joint / spring joint |
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What is a dial indicator used for? |
Compare a known or measured feature to something else |
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What are the 4 broad categories of precision measuring tools? |
Outside Inside Depth Height |
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What are the two most common outside measuring tools? |
Vernier caliper Outside micrometer |
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What is discrimination of an imperial vernier slide caliper ? |
0.001” |
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What is the discrimination of a metric vernier slide caliper? |
.02 mm |
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What is the discrimination of a standard inch mic? Vernier inch mic? |
.001” .0001” |
