Using measuring instruments

Evernote Snapshot 20130112 232741

Vernier calipers

Precision: 0.1 mm, for things between 1 and 10 cm long

Typed instructions: How to use and read

Animation:

Using_the_caliper_new_en

Zero error: (measured when the jaws are closed)

  1. None – when the 0 mark of both scales are in line with each other
  2. Positive – when the 0 mark of the vernier scale is to the right of the fixed scale’s 0 mark.

How to remove: Count it from the left of the vernier scale (0 mm->). For example, if the 0.6 mm marking on the vernier scale coincides with a marking on the main scale, the zero error is +0.6 mm. Therefore, subtract 0.6 mm from the final reading.

3. Negative – when the 0 mark of the vernier scale is to the left of the fixed scale’s 0 mark.

How to remove: Count it from the right of the vernier scale (<-1.0 mm). For example, if the 0.6 mm marking on the vernier scale coincides with a marking on the main scale, the zero error is -0.4 mm instead because it is counted from the right. Therefore, add 0.4 mm to the final reading.

Micrometer screw gauge (aka MSG 🙂

Precision: 0.01 mm, for things less than 1 cm long

Parts:

vfig10a

Steps:

  1. Turn the thimble until the spindle and anvil are nearly touching the object. Do not squash it!
  2. To fine-tune the measurement, turn the ratchet until it starts to click. This is when the spindle and anvil are touching the object
  3. Lock the micrometer screw gauge.

Animation:

Micrometer_no_zero_error

Zero error:

  1. None – The 0 mark on both the datum line and the thimble are in a straight line.
  2. Positive – The 0 mark on the thimble is below the datum line.

How to remove: Take the reading on the thimble and subtract it from the final reading.

3. Negative – The 0 mark on the thimble is above the datum line.

How to remove: Count the number of divisions between the 0 marks of the datum line and thimble. Add this reading to the final reading.

* Pendulum

An oscillation is one complete to-and-fro movement of the bob.

A period is the time taken to complete an oscillation.

– Only the length of the pendulum affects the period of an oscillation!

What is it used for?

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