The document discusses various precision measurement tools used in robotics, including the dial caliper, micrometer, and steel rule. It provides detailed instructions on how to use each tool, specifically how to reset and take measurements with the dial caliper in thousandths of an inch as an outside caliper, inside caliper, and depth gauge. It also explains how to read measurements on a micrometer's graduated barrel and thimble scales in hundredths of an inch. Finally, it notes that steel rules can measure in both fractional and decimal inch values.

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Precision Measurement Tools
Dial Caliper
Steel Rule
Micrometer

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Dial Caliper
A dial caliper is a
precision
measuring device
that can measure
in thousandths of
an inch. The dial
caliper functions as
an:
•Outside caliper
•Inside caliper
•Depth gauge

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Outside caliper
Using the dial caliper as an outside caliper

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Using the dial caliper as an outside caliper

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Inside caliper
Using the dial caliper as an inside caliper

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Using the dial caliper as an inside caliper

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Depth gauge
Using the dial caliper as a depth gauge

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Using the dial caliper as a depth gauge

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Resetting the dial caliper to zero
Begin by gently closing
the calipers. Do not over
tighten, close the jaws
until they are touching
Gently turn the glass dial
until the indicator reads
zero.
Step 1 Step 2
Note the indicator is not on zero

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Measuring with a dial caliper
What is the
reading on the
dial caliper at
the left?
?

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Measuring with a dial caliper
1.000
One inch

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1.000
.300
One inch three hundred
Measuring with a dial caliper

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1.000
.300
+ .050
One inch three hundred fifty thousands
Measuring with a dial caliper
1.350

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Measuring with a dial caliper
1.000
One inch

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Measuring with a dial caliper
1.000
.800
One inch eight hundred

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Measuring with a dial caliper
1.000
.800
+ .075
1.875
One inch eight hundred seventy five thousands

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What is the reading on this caliper?
Nine hundred and ninety thousands

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What is the reading on this caliper?
Two inch two hundred and sixty thousands

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What is the reading on this caliper?
Four inch one hundred twenty five thousands

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You have to walk before your run…

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Micrometer
The barrel consists of a
graduated scale that
reads from 0-9. There
are four marks between
each number. Each
mark signifies .025
(twenty five thousands).

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Micrometer - thimble
The thimble has a
graduated scale that
runs from 0-25.

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Reading the Micrometer
There are four marks
on the barrel.
4*.025 = .100
Zero marks on the
thimble.
The micrometer reads
.100 of an inch

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Reading the Micrometer
Two numbers on the barrel
.200
There are almost three lines
after the last whole number
2*.025 = .050
21 on the thimble.
.271 or two hundred seventy one thousands

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Steel Rules

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Steel Rules
The top rule measures in fractional values
The bottom rule measures in decimal values

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Inches to mm = Multiply by 25.4
Mm to inches = Divide by 25.4
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