How to Read a Micrometer to 0001
Be certain to unlock the locking lever before attempting to rotate the thimble.
Clean the measuring faces with a clean cloth before and later on measurements.
Information technology is also a good practice to occasionally clean the spindle to continue whatsoever contaminants from existence fatigued into the sleeve. Use the grip on the thimble when requiring a big amount of travel but every bit you lot come close to closing in on the object to be measured use the ratchet stop then as to not over tighten the thimble and give an erroneous reading. Never exit a micrometer exposed in the hot sun and then endeavor a measurement. This would also lend to an erroneous reading. When a micrometer is at its minimum reading the horizontal line on the sleeve should line up with the �0� on the thimble. If that is not the example it volition be necessary to calibrate the micrometer by rotating the sleeve. Each micrometer comes with a half moon adjusting wrench for this purpose. To make the adjustment simply puzzle the wrench to the side of the spindle and insert the small tip into the leverage hole. It will not require much effort to turn the spindle yet there is sufficient resistance in the spindle then that it will never move on its own. Larger micrometers are supplied with standards to cheque for correct calibration. When checking, exist certain to hold the standard squarely between the anvil and spindle. To help with this try rotating the standard slightly with your fingers while gently turning the thimble as you close in on the standard.
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i. Reading a .001� scale
two. Reading a .0001� calibration
iii. Reading a .01mm scale
4. Reading a .001mm calibration
First of all, the basics:
The pitch of the screw thread on a standard spindle is 40 threads per inch. One revolution of the thimble advances the spindle confront toward or away from the anvil confront precisely ane/40" or 0.025" equaling the distance between ii graduations on the sleeve. The reading line on the sleeve is divided into 40 equal parts by vertical lines that correspond to the number of threads on the spindle. Therefore, each vertical line designates 1/xl" or 0.025". Every fourth line, which is longer than the others, designates 0.100" and is numbered. The beveled edge of the thimble is divided into 25 equal parts with each line representing 0.001" and every line may or may not be numbered however every 5th line is numbered consecutively. To read the micrometer in thousandths, multiply the number of vertical divisions visible on the sleeve by 0.025", and to this add the number of thousandths indicated by the line on the thimble which best coincides with the primal long line on the sleeve.
Now some examples:
How to read a micrometer graduated in 0.001"
Micrometer thimble showing 0.276 inch
In the picture above, the thimble is positioned to where it is setting between the 2nd and 3rd numbered graduation thus two 10 0.100� = 0.200�. By that there are three additional sub-divisions, which is 3 ten .025� = 0.075�. Lastly the graduation one on the thimble is the closest to the primal long line on the sleeve therefore one x 0.001� = 0.001�. The reading thus would be 0.200� + 0.075� + 0.001�, totaling to 0.276".
How to Read an Outside Micrometer Graduated in 0.0001" (using the extra vernier scale). Many micrometers include a vernier calibration on the sleeve in addition to the regular graduations. This allows measurements within 0.001 millimeters to exist made on metric micrometers, or 0.0001 inches on inch-arrangement micrometers.
The additional digit of these micrometers is obtained by finding the line on the sleeve that all-time coincides with the line on the thimble. The number of this coinciding vernier line represents the additional digit.
This next example uses a 1� to 2� micrometer (shown with the 1� standard).
The horizontal calibration on the sleeve is marked with graduations every .025 (25 thousandths). Every 4th graduation (starting after �0�) is numbered consecutively. These numbers represents 0.100 (4 x .025 = 0.100) which is read as 100 thousandths.
The vertical scale graduations on the thimble represent .001 (1 thousandths). Every 5th graduation is numbered for clarity.
The vertical calibration graduations on the sleeve represent .0001 (10th of a thousandths). This is the vernier scale.
Micrometer reading ane.1551 inches
The reading for this case is determined past adding five separate figures.
And these are:
� Length of the standard - ane.0000
� The numbered graduation on the sleeve � �1� or 0.1000
� Two additional graduations on the sleeve � 2nd line past the �1� which is two x .025 = .050 (fifty thousandths).
� The number of thousandths on the vertical scale of the thimble - between 5 and 6 therefore .005
� The best match upwardly of the two vertical scales which is 1 therefore .0001
Full of all five figures:
one.0000
0.grand
0.0500
0.0050
0.0001
is
1.1551 which is simply read as �ane.1551 inches� or could exist read as �1 and i k five hundred fifty one ten-thousandths of inches�.
Another case in inches using a 0� to ane� micrometer:
How to read a micrometer graduated in 0.01mm
The pitch of the screw thread on a metric spindle is one-half millimeter (0.5mm). One revolution of the thimble advances the spindle face toward or away from the anvil face precisely 0.5mm. The reading line on the sleeve is graduated above the central long line in millimeters (one.0mm) with every fifth millimeter being numbered. Each millimeter is too divided in half (0.5mm) below the key long line. The beveled edge of the thimble is divided into 50 equal parts, with each line representing 0.01mm and every 5th line being numbered from 0-fifty. Thus, the number of millimeter and half-millimeter divisions visible on the sleeve plus the number of hundredths of a millimeter indicated by the thimble graduation, which coincides with the primal long line on the sleeve, give the reading.
Micrometer thimble reading 5.78mm
In the picture show above, the thimble is positioned to where the edge of the thimble bevel is positioned between the 5th and 6th graduation on the upper side of the scale thus five.0millimeter. It is besides by the next graduation on the lower side of the scale thus an boosted 0.5mm. Finally graduation 28 (.28) on the thimble coincides with the primal long line on the sleeve. The reading and so would be 5.00 + 0.5 + 0.28 = five.78 mm.
How to read a micrometer graduated in 0.001mm 
In the higher up picture this micrometer has the additional vernier scale on the sleeve. It is reading about the aforementioned as the previous example however a more than accurate reading tin can be obtained with this vernier scale. The #31 graduation on the thimble lines up all-time with the .003 graduation mark on the sleeve. Thus the reading would be 5.00 + 0.5 + 0.28 + .003 = 5.783mm.
For accurate readings on all precision measurements information technology is important to hold the work slice squarely with the measuring tool. Consider purchasing a micrometer stand up that tin serve as a �third hand�. A stand can greatly improve the accuracy of a measurement and really speed up the process especially when measuring parts repetitiously.
Source: http://www.chicagobrand.com/help/micrometers.html
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