How to Read a Metric Vernier Caliper
How to Read a Metric Vernier Caliper
Bob and Sparky explain how to read metric vernier calipers. You can get some practice sheets at http://weldnotes.com
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Content
0 -> Hi, I'm Bob weld
1.41 -> And this is how to read a metric vernier caliper there are different kinds of vernier scales designed to do different jobs
7.689 -> But they all work pretty much the same way today
10.44 -> We're going to look at a metric vernier designed to measure to the nearest 150th of a millimeter that is point zero two
17.98 -> Millimeters see how one divided by 50 equals point zero two
22.3 -> Now the first thing we're going to measure with our vernier caliper is nothing
26.58 -> That's right [will] measure zero it may sound [like] a silly thing to do
31.05 -> But we're going to do it for a couple of reasons. Let's do it, and you'll see what I mean
35.26 -> You see when the calipers are fully closed measuring zero width you can see the places where you can take measurements
42.16 -> These surfaces are where the two parts of the calipers line up?
46.18 -> You'll also notice there are gaps and a couple of places on the calipers these are not places to take measurements so don't mess up
52.62 -> By putting something in one of those gaps
55.12 -> Now with the calipers closed you can see where you're supposed to read the main scale
60.37 -> there are two scales on a vernier caliper the main scale and the vernier scale I'm
65.5 -> Going to erase the vernier scale and let you just look at the main scale first
69.939 -> You see the zero mark points to the place where you're supposed to read the main scale
75.04 -> Right now it points to zero do you see that good let's read the main scale first. [it's] super easy
82.33 -> I'll close the calipers on this work piece, and we'll see what the main scale says
88.03 -> These marks represent hole millimeters, so the reading is one two three four five five
95.32 -> Millimeters, just be sure to look at the zero mark and not at this part
100.079 -> That's a common mistake, and it will give you the wrong reading so the reading is five millimeters
106.6 -> That's pretty easy right before we move on to the vernier scale let me show you what it's going to tell us, okay?
114.579 -> Let's say when we looked at the main scale the reading wasn't right on the mark like it was last time
119.619 -> Let's say it looked like this
122.14 -> See how the mark is between five and six millimeters. It looks like it's a little beyond halfway
128.08 -> You see the vernier scale is going to tell us almost exactly how far over the mark is
135.489 -> Okay, you're ready to see the vernier scale
137.77 -> But I'm only going to draw the main part of it first now you see the marked number from zero to ten
144.58 -> Each of these marks represents a tenth of a millimeter they're going to tell us the tenth of a millimeter and here's how they work
152.59 -> Look carefully
153.48 -> And you [will] notice that one of the marks on the vernier scale lines up better with the main scale marks and the others
161.319 -> Which one looks like it lines up best to you? [I'll] zoom in and let you look
166.84 -> Let me show you a hint about where to look on the vernier scale to see where the marks line up
171.28 -> You see how our pointer was a little more than halfway between marks that means the vernier scale will line [up] a little past halfway
179.62 -> Now do you see the mark that lines up better than the rest?
183.01 -> It looks like the seven is lining up the seven means point seven millimeters
189.069 -> but this caliper can measure even more accurately than that I'll
193.63 -> Redraw all the marks and let you look again
196.78 -> Now see that the mark next to the seven lines up best, but what is the value of that mark?
203.59 -> Remember how this caliper had a label that said point zero two on it
208.09 -> That is what each mark is point zero two millimeters
212.2 -> Let's count up on the vernier scale to be sure we've got it this 6 would be 0.6
217.68 -> teen the next Mark point 62 then point six four point six six point six eight point seven zero
225.37 -> then point 72
228.13 -> The reading is five point seven two millimeters pretty neat, huh?
234.28 -> I'm going to let you try a few we're going to start off easy
237.51 -> I'm going to draw a caliber that only reads to the nearest tenth of a millimeter just to be sure you're with me
242.519 -> I'm going to show you the overall picture first then zoom in to let you see the vernier better, okay?
249.37 -> When you see [Sparkies] pause pause the video and write down what you think the reading is
256.239 -> The reading is sixteen point two millimeters. Let me step you through it
261.18 -> Just in case you missed something here are the hole millimeters from the main scale 10 11 12 13 14 15 16
269.319 -> okay, and
270.669 -> You see how the reading is just past 16 mark
274.719 -> so we'll look to the front of the vernier scale for where the marks line up and
281.02 -> There it is at the point to mark so the reading is sixteen point two milliliters. You got it, okay?
288.449 -> Let's go for broke and see if we can read the full point zero two millimeter resolution
293.65 -> Ready for this one again. I'll show the whole caliper then zoom in to let you see the vernier better here
300.629 -> We go pause the video and write down your answer
309.639 -> Now I know this is hard so before I give the answer I'm going to point to the place where the vernier lines up
316.36 -> Does that help take a minute and check your answer and be sure it's correct?
322.449 -> The reading is 19 point one six
328.78 -> [let's] try another one this time
330.63 -> [I] won't give any hints
331.84 -> But I will [zoom] way in so you can see the calipers really well if you get this one
336.9 -> You pretty much know what's going on
339.22 -> Pause the video and make sure you can read the whole millimeters
345.28 -> Did you say 12 millimeters, okay?
347.86 -> Let's do the hard part [and] read the vernier scale I'll zoom in and let you take a closer look
352.99 -> But first remember the trick see how the reading is Beyond halfway between the marks that
357.91 -> Means we need to look on the high side of the vernier scale. I'll fly the view down there and let you look here
363.96 -> We go pause the video look carefully
374.45 -> The mark that lines up best is here now. What number? Is [that] this is the point seven so
381.86 -> 0.72 for
383.87 -> Six the answer is [12] point seven six
395.45 -> That's about all the time we have for now
397.58 -> Vernier calipers are hard to read, but with a little practice
400.24 -> I'm sure you'll be able to do it without too much trouble. I'm Bob weld and these are [weld] notes
Source: https://www.youtube.com/watch?v=vkPlzmalvN4