dial gages

Dial Gages are used to accurately measure movements of tests in progress.
They come in varying lengths and accuracies, so be sure to note gage factors and length.
The gage pictured below has a smallest increment of one thousandth of an inch (0.001), and can move1 inch.
Precision is listed as +/- 0.0005 inches.

Start by fastening the magnetic gage base to the equipment - simply push the button on the base in to activate the magnet.
Adjust the holding assembly to place the tip against the object to be measured.

Zero the gage by turning the black outside (zero) ring. Loosen locking nut first if it has one.
As the test progresses, read the dial units. There are 100 units per revolution, so keep track of the revolutions counter as well.
Always work in dial units and convert using the gage factor after testing. DO NOT CONVERT ON THE FLY!
Multiply the dial units x gage factor (0.001) to calculate displacement in inches.

In this example, dial units = 41

Hint Rocket Remember to record the Gage Factor before leaving lab!