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Measuring Techniques with Hardness Tester and Calipers
Aug 28, 2024
Lecture Notes: Using Shore D Polymer Hardness Tester, Calipers, and Micrometer
Introduction
Overview of using Shore D polymer hardness tester, calipers, and micrometer.
Importance of recording raw data in a lab book before entering it into a spreadsheet.
Shore D Polymer Hardness Tester
Shore:
Manufacturer
Scale D:
Used for harder polymers (e.g., Shore A for softer polymers).
Procedure:
Place the tester's indenter on the polymer and press down.
Perform the test with a partner; one person presses while the other reads the measurement.
Record the measurement in the lab book.
Repeat the process to ensure accuracy.
Using Calipers
Preparation:
Gently bring the jaws together and zero out the calipers.
Example provided is already zeroed.
Measuring Process:
Outer Diameter:
Use one side of the calipers.
Measure at multiple locations to check for irregularities.
Inner Diameter:
Use the other end of the calipers.
Avoid using parts beyond the measurement surface to ensure accuracy.
Depth Measurement:
Place edge of calipers on cavity edge and lower depth gauge.
Record units consistently.
Avoid measuring at indents.
Post-Measurement:
Turn off calipers to save battery.
Using a Micrometer
Storage:
Ensure jaws are slightly apart to prevent jamming.
Measurement Procedure:
Gently close the jaws and zero it out.
Set to inches for consistency.
Measuring Wires:
Larger diameter wire:
Use a partner to stabilize wire.
Measure gently to grip wire for accuracy.
Example reading: 0.0217 inches.
Measure three times at different points.
Record reference letter associated with wire.
Smaller diameter wire:
Handle carefully to prevent slipping.
Post-Measurement:
Ensure jaws are slightly apart before storing the micrometer.
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