Micrometer

[ahmedelshfie]

This applet written by Fu-Kwun Hwang
Edited by LooKang WEE and Wolfgang Christian
Modified by myself
Original project micrometer with .001 mm or .001 inch resolution /dial mode

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<applet code='users.br.ahmed.Micrometer_pkg.MicrometerApplet.class' archive='http://www.phy.ntnu.edu.tw/ntnujava/ejsuser/37048/ejs_Micrometer.jar' name='Micrometer5762' id='Micrometer5762' width='689' height='475' mayscript=true><param name='draggable' value='true'></applet>
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[ahmedelshfie]

Basic types
Large micrometer caliper
The image shows three common types of micrometers; the names are based on their application:
Outside micrometer (aka micrometer caliper), typically used to measure wires, spheres, shafts and blocks.
Inside micrometer, used to measure the diameter of holes.
Depth micrometer, measures depths of slots and steps.
Bore micrometer, typically a three-anvil head on a micrometer base used to accurately measure inside diameters.Tube micrometer, used to measure the thickness of tubes.
From http://en.wikipedia.org/wiki/Micrometer

[ahmedelshfie]

The Micrometer
A micrometer allows a measurement of the size of a body. It is one of the most accurate mechanical devices in common use. This document introduces this instrument.

If you are a student in the Physics laboratory at the University of Toronto, the material discussed here is also covered in the Commonly Used Instruments section of the First Year Laboratory Manual. There is also a videotape on using a Micrometer and a Vernier Caliper available from the laboratory technologists.

[ahmedelshfie]

Because of the mechanical advantage due to the fine pitch of the screw threads that move the thimble and the right-hand measuring rod, it is easy to use enough force in closing the rods on the object being measured to deform either the rods or the object. In the diagram you can see a Friction Screw, which applies "just enough" torque to rotate the thimble in a gentle manner.


http://www.upscale.utoronto.ca/PVB/Harrison/Micrometer/Micrometer.html

[ahmedelshfie]

The Micrometer Model shows the principle of operation and the physical parts of a real micrometer. 
Micrometers use a screw to amplify distances that are too small to measure directly into large rotations of the screw that are big enough to read from a scale.
The accuracy of a micrometer derives from the accuracy of the thread that is at its heart.
The basic operating principles of a micrometer is that the rotation of an accurately made screw can be directly and precisely correlated to a certain amount of axial movement (and vice-versa), through the constant known as the screw's lead.