![]() ![]() Then, read the value shown on the thimble scale. In this case, the sleeve scale reading is 6.5mm.ns best with the index line on the sleeve scale. On the sleeve scale, each minor increment represents 0.5mm. This will be given in millimeters on a metric micrometer. ![]() This is the number directly to the left of the thimble. On the sleeve scale, you can find the value of the first significant figure of a measurement. How Do You Read a Depth Micrometer in MM? Step 1 :- Look at Sleeve Scale When using a micrometer with an additional Vernier scale, the value on the Vernier scale may also be considered. Micrometer measurements are a combination of the value shown on the sleeve scale and the value indicated on the rotating sleeve scale. Using the micrometer thimble alone requires some skill and practice to get the right “feel.” Step 4 :- Lock Spindle Step 5 :- Read the measured value, and add this to the length of the extension rod used. The ratchet will continue to turn, applying the proper amount of force for an accurate measurement. Turn the thimble slowly and clockwise, holding the base of the micrometer, until the tip of the rod is close to the bottom of the hole or step.Īs you approach the surface to be measured, carefully turn the ratchet until the spindle stops rotating. Insert the measuring rod as close to the edge (but not touching) as possible into the hole or onto the step being measured. Using this estimate, choose the appropriate extension tube and insert it into the micrometer’s bottom. Using a rule or tape measure, estimate the distance to be measured. Make sure the micrometer is zeroed first by inserting the 0-25mm (or 0-1′′) rod and following the instructions in the section on zeroing your micrometer. How to Use a Depth Micrometer Step 1 :- Insert the spindle By removing the spindle cap, you can easily insert the extension rod. By using extension rods in 25 mm increments, the range can be increased up to 0-90 mm. The depth micrometer is available in two ranges: 0 -25 mm and 0-50 mm. As a result, the thimble reading is Total reading= 17 + 0.14 = 17.14 mm The 14th division line of the thimble corresponds to the reference line. The use of a depth micrometer is depicted in Figure. The scale indicates zero when the spindle is flush with the face and maximum when the spindle is fully extended from the base. As the spindle moves away from the base, the measurement increases because the barrel’s scales are reversed from normal. The measurement is taken between the spindle’s end face and the measuring face of the base. The axial movement of the spindle is accomplished by rotating the thimble. It is made up of a base (measuring face) that is attached to the barrel and a measuring spindle that is attached with a thimble, as shown in Fig. Depth micrometer can only be used in places where there is a satisfactory seating for the instrument head, and the bottom of the hole being measured is parallel with the seating. Reading depth micrometers is a precise science that must be performed carefully.ĭepth micrometer is an instrument used for measuring depth of holes to an accuracy of 0.01 mm and 0.001 in. Used by engineers and mechanics, this device has a series of unique pieces that help it dial in an exact measurement. How Do You Read a Depth Micrometer in MM?Ī depth micrometer is a sensitive tool that is used to measure the depth of small holes and bores.Step 5 :- Read the measured value, and add this to the length of the extension rod used. ![]()
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