Measuring Tools Part A Flashcards
What are the four types of steel rulers and there uses?
Spring tempered ruler-designed not to be bent. Accurate straight edge. Measures to 1/64 or .5mm
Flexible rule- made of thin stock used for measuring curves
Narrow rule-to be used in tight spaces
Hook rule-measure a chauffeur edge or line up with end of work piece
What are the lines on a steel rule? What is the smallest measurement?
Graduations
Fractional inch rule 1/64
Decimal inch rule .010
Metric rule .5mm
What are 3 common graduations?
Imperial inch
Decimal inch
Metric
What 2 types of measuring tapes are there?
Short line - less then 30 ft
Long line - up to 60 ft
What two tools are used for angular measurement? And what is there accuracy?
Plate protractor measure angles within 1 degree of accuracy
Universal bevel protractor. Measures angles within 5 minutes of a degree
What are the angular measurement units?
Full circle 360 degrees
1 degree 60 minutes
1 minute 60 seconds
What is the smallest increment the vernier scale can give you?
- 001 inch or
0. 02mm
What are the 3 types of precision callipers?
Vernier calliper
Dial calliper
Electronic digital calliper.
What is a height gauge used for?
Height gauges are used for precision layout or for measuring how high a feature is above a flat surface.
What are the 7 parts of a micrometer?
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What is the pitch of a imperial micrometer? How far does the thimble move on a complete revolution?
What is the pitch on a metric micrometer?
Pitch=0.025”
.025 inch every revolution
Metric pitch= 0.5mm
What is a intramik
An intramik uses three contact points to measure across the true diameter.
What tool can be used to measure depth?
Micrometer depth gauge
What are thickness/feeler gauges used for?
- Check bearing clearance or gear backlash
- Check tappers, spark plug gaps
- check clearances to fit piston rings and pins
- gauge gaps in narrow slots
- measure angularity in coupling shaft
What is a taper gauge used for?
- determine the width of a slot
- measure angularity of a coupling shaft alignment
Vernier bevel protractor graduations measure ______ minutes?
5 minutes (1/12degree)
Broke into 90 degree segments
Reading a vernier bevel protractor?
Checking the jaws of a vernier calliper is done by?
Close the jaws and hold up to the light. If you can see light through the jaws they are worn and need to be replaced
How much pressure is applied to a vernier calliper?
Just enough pressure that the jaws remain in full contact with the workpiece
Vernier scale imperial
Metric vernier calliper
How are vernier height gauges read?
Same as a vernier calliper
What is the advantage of a 50-division vernier scale?
Half as many beam graduations as the 25-graduations making it much easier to read to .001” or .02mm
Two ways to apply proper force to the micrometer?
1: close the micrometer with the ratchet stop until the ratchet stop clicks once.
2: close the micrometer by turning the the thimble until the feel is right.
Ratchet method is more consistent
Reading a vernier micrometer
Reading a vernier micrometer
When reading a depth micrometer remember how to read the main scale? What is the difference from a normal micrometer?
You are reading the numbers you cannot see. Opposite of a normal micrometer
9 is visible meaning the first number would be .800”
