{"id":14,"date":"2014-04-01T11:48:53","date_gmt":"2014-04-01T11:48:53","guid":{"rendered":"http:\/\/weldnotes.com\/?p=14"},"modified":"2017-01-25T01:37:41","modified_gmt":"2017-01-25T01:37:41","slug":"how-to-read-a-metric-micrometer","status":"publish","type":"post","link":"http:\/\/weldnotes.com\/?p=14","title":{"rendered":"How to Read a Metric Micrometer"},"content":{"rendered":"<div class=\"video-container\"><iframe loading=\"lazy\" title=\"How to Read a Metric Micrometer by WeldNotes.com\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/StBc56ZifMs?feature=oembed&#038;wmode=opaque\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>A micrometer is used to take very precise measurements.<\/p>\n<p>There are different kinds (inside, outside, depth, inch), just look it up on <a href=\"http:\/\/en.wikipedia.org\/wiki\/Micrometer\" target=\"_blank\">Wikipedia<\/a>. But here I have a metric one. This one measures to the nearest .01 mm. It says so right here (click the picture for a better view&#8230;.<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-19\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-300x189.png\" alt=\"Metric Micrometer\" width=\"300\" height=\"189\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-300x189.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-1024x646.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer.png 1044w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>You use a micrometer by turning the knurled parts (the &#8220;grippy&#8221; ones).\u00a0 If a micrometer does not turn freely don\u2019t force it.\u00a0 Look for a lock, it might be locked.<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-lock.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-20\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-lock-300x187.png\" alt=\"micrometer lock\" width=\"300\" height=\"187\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-lock-300x187.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-lock-1024x640.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-lock.png 1029w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>As you turn the knurls, the measuring parts open up. These are called the spindle and the anvil. The spindle moves, the anvil does not. When you tighten down on the thing you are measuring, only use the &#8220;clicky&#8221; part (ratchet sound) on the very end. This makes the measuring force consistent and it keeps you from ruining your mic. Let&#8217;s take a close look at what is called the barrel scale. You will notice there are two sets of marks and a line. The marks above the line are millimeters; the marks below the line are half millimeters.<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-BARREL-SCALE.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-BARREL-SCALE-300x188.png\" alt=\"micrometer BARREL SCALE\" width=\"300\" height=\"188\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-BARREL-SCALE-300x188.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-BARREL-SCALE-1024x643.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-BARREL-SCALE.png 1036w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>You read this scale by looking at the edge of the part that turns. This part is called the thimble let\u2019s stop here a minute and be sure you are with me. What do you think the barrel scale is showing in the drawing below?<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-barrel-scale-reading.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-22\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-barrel-scale-reading-300x187.png\" alt=\"micrometer barrel scale reading\" width=\"300\" height=\"187\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-barrel-scale-reading-300x187.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-barrel-scale-reading-1024x640.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-barrel-scale-reading.png 1039w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Go to the next page to see the answer&#8230;<\/p>\n<p><!--nextpage--><\/p>\n<p>If you said 12 mm, you were right! Let&#8217;s try another one to be sure you&#8217;ve got it.\u00a0 Remember, you can click the picture to get a better view.<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-barrel-scale-reading-2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-29\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-barrel-scale-reading-2-300x189.png\" alt=\"micrometer barrel scale reading 2\" width=\"300\" height=\"189\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-barrel-scale-reading-2-300x189.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-barrel-scale-reading-2-1024x647.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-barrel-scale-reading-2.png 1029w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>do you see 14mm?\u00a0 Good.\u00a0 Let&#8217;s move on.\u00a0 Remember that the barrel scale shows both whole and half millimeters? Take a look at the reading below to see if you understand how that works.<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-Half-MM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-30\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-Half-MM-300x187.png\" alt=\"Metric Micrometer Half MM\" width=\"300\" height=\"187\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-Half-MM-300x187.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-Half-MM-1024x639.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-Half-MM.png 1053w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Did you say 11.5?\u00a0 See how there is a half mark showing?\u00a0 Great! You&#8217;ve got the barrel scale down.<\/p>\n<p>Remember that we said this micrometer would measure down to the nearest 1\/100 the of a millimeter?\u00a0 We can do this because of the thimble scale.\u00a0 The thimble scale has fifty marks around it.\u00a0 It also opens or closes the spindle by one-half millimeter each time it turns around.\u00a0 This means that each mark on the thimble scale equals 0.01 millimeters (that&#8217;s tiny!).\u00a0 Here is how it looks&#8230;<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-resolution.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-32\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-resolution-300x189.png\" alt=\"Metric Micrometer resolution\" width=\"300\" height=\"189\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-resolution-300x189.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-resolution-1024x645.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/Metric-Micrometer-resolution.png 1039w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>The best way to use the thimble scale is to remember that each mark represents two digits (the tenths and hundredths places).\u00a0 So look at a number like five as 0.05 , and ten as 0.10. This thimble scale above is reading 0.00\u00a0\u00a0 See how the zero lines up with the horizontal line on the barrel?\u00a0 You read the thimble scale at this line.<\/p>\n<p><!--nextpage--><\/p>\n<p>Now let&#8217;s put all of this together and try to figure out what the micrometer below is reading.<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-reading-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-34\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-reading-1-300x188.png\" alt=\"micrometer reading 1\" width=\"300\" height=\"188\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-reading-1-300x188.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-reading-1-1024x641.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-reading-1.png 1050w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>First the barrel scale:\u00a0 count over from the 10&#8230;11&#8230; and 12.\u00a0 So it&#8217;s 12 mm plus something. The &#8220;something&#8221; comes from the thimble scale.\u00a0 Remember we will read the thimble scale as two decimal places.\u00a0 So starting with the thirty (printed on the thimble) we count up to 33 before we get to the horizontal line we are reading from.\u00a0 So the barrel reads 12 mm and the thimble reads 0.33 mm.\u00a0 It may be a good idea to write down what each scale is reading and then add them together like this&#8230;<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-reading-explained.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-35\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-reading-explained-300x187.png\" alt=\"micrometer reading explained\" width=\"300\" height=\"187\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-reading-explained-300x187.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-reading-explained-1024x639.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/micrometer-reading-explained.png 1037w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>This is pretty obvious for this reading, but it will help explain the next concept.<\/p>\n<p><!--nextpage--><\/p>\n<p>If you can read this one you are done.\u00a0 You pretty much owned this tutorial.\u00a0 Give it a try&#8230;<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/weldnotes-micrometer.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-37\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/weldnotes-micrometer-300x188.png\" alt=\"weldnotes micrometer\" width=\"300\" height=\"188\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/weldnotes-micrometer-300x188.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/weldnotes-micrometer-1024x643.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/weldnotes-micrometer.png 1036w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>The reading is 11.72 mm.\u00a0 If you got that, way to go!\u00a0 Let&#8217;s break it down:\u00a0 First the barrel.\u00a0 10 is the biggest number showing, so count over from there to 11, but notice the half mark is the last mark displayed.\u00a0 This means the barrel scale is reading 11.5.\u00a0 If you don&#8217;t see it, look under the horizontal line.\u00a0 Now write down 11.50 (it&#8217;s best to write down two decimal places to keep everything consistent.<br \/>\nNow look at the thimble, 0.20 is the last printed number, so count up from there to 0.22 and write that down. Now add them up and you get 11.72 mm.<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/bobwelds-micrometer1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-40\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/bobwelds-micrometer1-300x188.png\" alt=\"bobwelds micrometer\" width=\"300\" height=\"188\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/bobwelds-micrometer1-300x188.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/bobwelds-micrometer1-1024x644.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/bobwelds-micrometer1.png 1033w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Only one more concept and we are done. What if one of the marks on the barrel scale is just barely showing.\u00a0 Do you count it?\u00a0 Is it ready to be used? Here is the\u00a0 trick: Don&#8217;t look at the mark to find out whether the mark is showing or not&#8230; Look at the thimble.\u00a0 You need to know if a new mark is starting or an old mark is ending.\u00a0 In this example, look at how big the number on the thimble is.<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/ending.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-41\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/ending-300x188.png\" alt=\"ending\" width=\"300\" height=\"188\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/ending-300x188.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/ending-1024x642.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/ending.png 1033w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>It is showing about .47mm.\u00a0 That is a big number (the scale only goes up to 49).\u00a0 Since the scale is nearing the end, it&#8217;s &#8220;ending&#8221; you don&#8217;t count a mark that is barely showing. The trick is to find which side of zero you are working on.\u00a0 Not yet to zero, not yet a mark.\u00a0 In the drawing below, I moved the micrometer a little bit.\u00a0 Now the, the mark is ready to be counted because the thimble scale is &#8220;starting.&#8221;<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/starting.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-42\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/starting-300x190.png\" alt=\"starting\" width=\"300\" height=\"190\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/starting-300x190.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/starting-1024x648.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2014\/04\/starting.png 1032w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>You see that the numbers on the thimble are small because the zero just passed by.\u00a0 This means the mark is ready to be used. So that&#8217;s pretty much it. There are some micrometers that can measure even more accurately than this, they have a thing called a &#8220;vernier&#8221; scale on them.\u00a0 I can show you how to read those another time if you want.\u00a0 Just let me know.\u00a0 But for now this should get you started.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A micrometer is used to take very precise measurements. There are different kinds (inside, outside, depth, inch), just look it up on Wikipedia. But here I have a metric one. This one measures to&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":16,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,5],"tags":[],"class_list":["post-14","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-math","category-measurement"],"_links":{"self":[{"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/posts\/14","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/weldnotes.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=14"}],"version-history":[{"count":14,"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/posts\/14\/revisions"}],"predecessor-version":[{"id":51,"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/posts\/14\/revisions\/51"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/media\/16"}],"wp:attachment":[{"href":"http:\/\/weldnotes.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/weldnotes.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/weldnotes.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}