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How to use a depth micrometer

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Step 1 Insert a spindle of the correct length into the bottom of the micrometer.

Step 1 – Insert spindle

Ensure that the micrometer is first zeroed by inserting the 0-25mm (or 0-1″) rod and refering to the section on zeroing your micrometer.

Roughly estimate the distance to measure using a rule or tape measure. Use this estimate to select the appropriate extension tube, and insert into the bottom of the micrometer.

Step 2 Place the measuring rod into the hole being measured as close to the edge as possible.

Step 2 – Position

Place the measuring rod into the hole or onto the step being measured, as close to the edge (but not touching) as possible.

Step 3 Hold the base of the micrometer in place, and turn the thimble slowly in a clockwise direction until the tip of the rod touches the bottom of the hole.

Step 3 – Turn thimble clockwise

Holding the base of the micrometer, turn the thimble slowly and in a clockwise direction until the tip of the rod is close to the bottom of the hole or step.

Carefully turn the ratchet as you approach the surface to be measured and continue turning until the spindle stops rotating.

Turning ratchet speeder of depth micrometer, turn ratchet, using depth micrometer The ratchet will keep turning, applying the correct amount of force for an accurate measurement.

Using the micrometer thimble alone requires a degree of skill and practice to achieve the correct “feel”.

Step 4 Lock the micrometer with the lock nut and carefully remove the tool from the hole. Step 5 Read the measured value (See How to Read a Micrometer).

Step 4 – Lock spindle

Lock the micrometer spindle using the locking device and carefully remove the instrument from the workpiece.

Step 5 – Read measured value

Read the measured value, and add this to the length of the extension rod used. (See How to Read a Micrometer).

Wonkee Donkee says: 'When taking measurements, try not to touch the measuring faces of the micrometer. Even the smallest amount of oil on your hands can affect the accuracy of your readings.'

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