Micrometers That Read to .0001 but Dont Have a Scale
Be sure to unlock the locking lever before attempting to rotate the thimble.
Clean the measuring faces with a clean cloth before and after measurements.
It is also a good practice to occasionally make clean the spindle to keep whatsoever contaminants from being drawn into the sleeve. Apply the grip on the thimble when requiring a large amount of travel simply as you come close to closing in on the object to be measured employ the ratchet stop so equally to not over tighten the thimble and give an erroneous reading. Never leave a micrometer exposed in the hot sun and then attempt a measurement. This would likewise lend to an erroneous reading. When a micrometer is at its minimum reading the horizontal line on the sleeve should line upwardly with the �0� on the thimble. If that is not the case it will exist necessary to calibrate the micrometer by rotating the sleeve. Each micrometer comes with a half moon adjusting wrench for this purpose. To brand the aligning only 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 however in that location is sufficient resistance in the spindle and then that it will never move on its own. Larger micrometers are supplied with standards to check for correct calibration. When checking, be sure 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 equally you close in on the standard.
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1. Reading a .001� scale
2. Reading a .0001� scale
three. Reading a .01mm calibration
four. Reading a .001mm scale
Kickoff 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 face precisely 1/twoscore" or 0.025" equaling the distance between two graduations on the sleeve. The reading line on the sleeve is divided into forty equal parts by vertical lines that correspond to the number of threads on the spindle. Therefore, each vertical line designates one/xl" or 0.025". Every quaternary line, which is longer than the others, designates 0.100" and is numbered. The askew 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 notwithstanding 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 past the line on the thimble which all-time coincides with the fundamental long line on the sleeve.
At present 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 second and tertiary numbered graduation thus ii x 0.100� = 0.200�. Past that there are 3 boosted sub-divisions, which is 3 x .025� = 0.075�. Lastly the graduation ane on the thimble is the closest to the central long line on the sleeve therefore 1 ten 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 scale on the sleeve in addition to the regular graduations. This allows measurements within 0.001 millimeters to be made on metric micrometers, or 0.0001 inches on inch-system micrometers.
The boosted digit of these micrometers is obtained by finding the line on the sleeve that best 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 ii� micrometer (shown with the i� 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 ten .025 = 0.100) which is read equally 100 thousandths.
The vertical scale graduations on the thimble represent .001 (ane thousandths). Every 5th graduation is numbered for clarity.
The vertical scale graduations on the sleeve represent .0001 (tenth of a thousandths). This is the vernier scale.
Micrometer reading ane.1551 inches
The reading for this instance is determined past adding five separate figures.
And these are:
� Length of the standard - 1.0000
� The numbered graduation on the sleeve � �1� or 0.grand
� Two additional graduations on the sleeve � 2nd line past the �1� which is 2 x .025 = .050 (l thousandths).
� The number of thousandths on the vertical scale of the thimble - between v and vi therefore .005
� The best lucifer upward of the ii vertical scales which is 1 therefore .0001
Full of all five figures:
1.0000
0.1000
0.0500
0.0050
0.0001
is
ane.1551 which is just read as �1.1551 inches� or could exist read as �one and one thousand five hundred fifty one ten-thousandths of inches�.
Another case in inches using a 0� to 1� 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 up toward or abroad from the anvil confront precisely 0.5mm. The reading line on the sleeve is graduated above the cardinal long line in millimeters (1.0mm) with every fifth millimeter being numbered. Each millimeter is too divided in half (0.5mm) below the central long line. The beveled border of the thimble is divided into fifty equal parts, with each line representing 0.01mm and every fifth line being numbered from 0-l. 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 central long line on the sleeve, give the reading.
Micrometer thimble reading 5.78mm
In the picture above, the thimble is positioned to where the edge of the thimble bevel is positioned betwixt the fifth and 6th graduation on the upper side of the scale thus five.0millimeter. It is besides past 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 central long line on the sleeve. The reading and so would be v.00 + 0.5 + 0.28 = 5.78 mm.
How to read a micrometer graduated in 0.001mm 
In the above picture this micrometer has the additional vernier scale on the sleeve. It is reading about the same as the previous example however a more than authentic reading tin be obtained with this vernier calibration. The #31 graduation on the thimble lines up best with the .003 graduation mark on the sleeve. Thus the reading would exist five.00 + 0.5 + 0.28 + .003 = 5.783mm.
For accurate readings on all precision measurements it is important to hold the work piece squarely with the measuring tool. Consider purchasing a micrometer stand that can serve equally a �tertiary hand�. A stand can greatly improve the accuracy of a measurement and actually speed upward the process especially when measuring parts repetitiously.
Source: http://www.chicagobrand.com/help/micrometers.html
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