Read a vernier caliper in INCHES, measure a ball bearing

in this video I will show you how to read a vernier calliper in imperial units of measurement that is in inches and I will demonstrate it by using this ball bearing that I found in a dumpster after an elevator was removed from the elevator shaft okay so first off parts of the caliper these are the jaws on the caliper and these are Spurs on the caliper the jaws on the caliper measure outside diameter dispersion the caliper measure inside diameter and there is one more thing at the end of the caliper here on the back side there is a sliding metal rod this being a sec there there you can see it's very simple that sliding metal rod comes out at the end of the caliper so you can measure depth with it like like so you kind of get the idea where the cameras are dance with it or more like what objects like this okay you go oh yeah that's what you can do with a caliper and this one is a six-inch caliper because it says inches on it right about there it also measures in millimeters and centimeters but this is a six-inch caliper or 15 centimeter caliper we are going to be using the inch scale and fractions of an inch on it so don't worry about millimeters now these caliper measures in inches in whole inches and in one one hundred and twenty eighth of an inch that's the finest amount of measurement oil on the caliper you have a thumb screw here on top which helps you blow a measurement after an item is measured there you can look the thumb screw remove the item with that without prying the jaws like that because that is no change your measurements so you look at thumbscrew and then you can take a measurement there is supposed to be a gap here between the jaws to clear some surface and even less around the ends of the object and this portion here at the bottom is designed to measure let me just get a better contrast there to measure thread very long times the robots okay so those are the parts of the caliper let's do some math we decide on the movie on the main scale caliper has two scales a means here on the main scale you can see numbers from here is 0 inches and here is 1 inch and then there is 2 inches there okay we are going to be using the inch scale and on the moving scale on the caliper you can see a bunch of lines 8 pieces of lines and the digits 0 4 and a given 0 4 & 8 and the smallest division on the caliper is 1 128 th first before you measure anything you make sure that the jaws are closed and in this position the two zeros should line up which to the zero on the sliding scale and let's hair line should line up with the zero on the main scale and it's hair line there are three adjustment screws these three black screws there on that one and the third one down the road that you can use and make sure that the zero when it when the jaws are closed the zeros must line up the way the caliper works is that none of the other hair lines should line up our caliper namely they just get closer namely that hairline shouldn't line up on the hairline on the sliding skill shouldn't line up with anything on the main scale when the jaws are fully closed neither should that or that or that or that or that or that by that point should and must and it will if these two zeros are lined up then that eight and the end where is that eight at the end must line up with one of the hair lines on the sliding's on the main scale okay so the eight on the sliding scale should line up with the one of the hair lines on the main scale any because depending on manufacturer this could vary in in this instant it lines up with 7/8 sorry it lines up with fifteen sixteen now on the main scale you don't have any other number just the whole inches so every hairline is 1/16 of an inch one-sixteenth one-eighth 3/16 1/4 sorry 5/16 3/8 7/16 half an inch 9/16 5/8 11 16th 3/4 of an inch 13:16 7 8 15 16 1/8 you don't know your fractions and to read the caliper in inches you have to be able to add and subtract fractions with common denominators and everything ok you have that skill ending fractions not subtracting only adding for now and finding the common denominator okay let's take a measurement first one let's measure outside the ammeter on this bearing and just zoom out a little bit bear with me wait for the machine just a little bit you measure outside the ammeter like so you clamp the object make sure that it's parallel and everything and you Dyke on the PAC's group and then here did you come out and let's take a measurement for that I'm going to zoom in just bear with me and they're bats this is how you roll first off we are going to need a whole one number for the whole number of inches sorry and this comes off the main scale you have to take a look at the zero on the sliding scale and determine how many whole inches has it passed it passed three whole inches so you write down three that's your it's not your ones digits that it's going to be a mixed number that you're gonna write down okay so that's the that's the first time I love yes we can laugh then you count the sixteenth first and second two sixteenth okay I know it's an eighth of an inch don't worry about it you can write down either honey I'm gonna write to sixteenth once you have to sixteen sweetener what it represents is that the zero and the sliding scale slid behind or behind past three and one eighth of an inch so we ought to pursue the measurement the outside diameter of the bearing is more than 3 and 1/8 but a little less than three and 3/16 okay there's got to be a measurement between these two lines so you write Anna because we always round down to determine how many 128 or the measurement it is this measurement over 3 and 1/8 of an inch we have to find an alignment we have to look at the airline's on the sliding scale and see which one of these airlines line up with any of the lines on the base here so that's what that one doesn't line up in anything neither does that no one is getting kind of closer that's pretty good-looking and that's what is off again now in the opposite way this one is off that way and this one is off this way so I'm going to pick that one the number that lives here is free if this one is for this y 0 and upper is for this is 3 3 what these are 128 7 H so that's 3 128 ok now I'm going to make a measurement we have 3 and 1 eighths here and now we have to add 3 128 to it you can see right away this is when problems arise where you need to add fractions you gotta have this here so to 16th of an inch is how many 128 well in in 1/16 of an inch where do I hide it 1/16 of an inch if the same as to 32nd of an inch is the same as the same you can see where it's going the denominator doubles so much the numerator so one two that's four that's a okay every every one sixteenth of an inch is the same as 8 128 so after these two sixteenth we have to make 128 so that this fraction and that fraction have both the same denominators so two sixteenths will equal 16 and they're going to write it a little bigger just a little bigger to 16 so that 216 is sixteen 128 lies in sixteen because 1/16 is eight 128 so two sixteenth will be 16 128 okay that's why I wrote this first fraction here in 16 even though this is 3 and 1/8 one in W Valley you need to count the sixteenth that's probably the easiest and after that we have three 128 measure here first second third that's where the alignment is so you have to add 16 128 + 3 128 and that's going to be when you add these two fellows together that's going to be 19 128 so the final answer is 3 inches because don't forget the 3 inches the final answer is after this math is done here three and nineteen 128 that's the outside diameter of this wall barrier let's take a measurement for the inside diameter and so the other way around and see how to go for the inside diameter we are going to need to use the stores on this Jennifer something like that you kind of move it around to find the to South centre and find the middle or the the widest point on the inside there are bats there for you Daisy now there we go okay let's see what we've got here they're just going to get rid of the first measurement there and wait for the camera to focus there are bats okay let's write down the first number which is sorry guys which first number is read from the main scale you have to see how many full inches has the zero to health with into this hairline how many colleges has it passed there is the two full inches only as indicated on the main scale and the zero is not passed it because we're going from this way numbers go on that way therefore we write down if I write it here one one full inch and it looks like somewhere around fifteen sixteenths but maybe a little more let's see how much more so I write on 15 16 and let's zoom in there for a little object lesson there okay that's about pretty good resolution there but I just want to touch closer just bear with me okay so this is the sliding scale sorry guys I hit up feel every time just a lot this is 15 sixteenth here and this is two inches okay you can see that the zero is past the 15/16 hairline here however if I look at the number of 128 this would be one one hundred and twenty eighths of an inch and that's misaligned so are the rest of the hair rise this is the closest alignment but you can see that just by the shoulder of a line there they are not perfectly aligned we have reached the measuring capability of the this sliding vernier caliper here you cannot make a fine and you cannot take a fine and reading on this one we're going to go with 1516 age there one inch and 15/16 even though you can clearly see that the actual measurement is a little more than that but it's so microscopic amount that now we're really talking about splitting hands but for accuracy's sake you can see that it's not 128 but you can also see that it doesn't line up so when i zoom out there about you can see that none of the lines on sliding none of the hair lines or the sliding scale line up with anything on the main scale so they're about and I can zoom in further out sorry but each and fifteen sixteenths is close enough on this one last measurement to be taken is on the bearing and it's thick last time so there so you can see what I'm doing this is the last measurement so I usually clamp the jaws tied here so I have a solid contact surface and an accurate measurement here just carefully remove it put it down there let's see what we've got here just gonna get rid of that one let's see what we have here that's a great start okay standard procedure the zero on the sliding scale you have to take a look at how many whole inches as it past the zero here is the first inch there that's one inch there it hasn't passed it so I'm not writing that any numbers any more numbers I'm going to write fractions from that a little bit this way so you can have it in the picture the sixteenth and the AIDS of the length of these lines are just slightly different and it's kind of confusing for my eyes I'm just gonna go with with a zero I don't know where half an inch is it's a little bit hard to read so I'm just going to count the sixteenth one at a time one 16 to 16 3 4 5 6 7 8 9 16 10 16 I'm just going to write 10 sixteenth even though it's 5/8 of an inch don't worry about it I like working with sixteenths because I know that 1/16 is 8 128 and I need 16 to convert easily do 128 so 10 16 and I'm going to need a measurement from the sliding scale I got to see which one of the hairlines meet up with any of the hair lines on the main scale so which one the hair lines on the sliding scale meet up with anything here the zero doesn't that was pretty close that's off that's off those are all off I was a pretty good candidate that's one 128 that hair line represents one 128 so I have 10 16 plus one 128 now I need to add the fractions but before I do ten sixteenth is how many 128 cuz we gotta have the same denominator all right it's going to be I'm just going to make it bigger and maybe write it here 10 16 plus 1 128 so use the same L 10 times 8 that's a multiplication okay 10 times 8 128 plus 1 128 why 10 times 8 equals 8 128 make 1/16 then we have n of those so 10 pieces of 8 128 is what we're talking about so that's obvious that that's going to be 80 80 128 plus 1 128 is 81 128 of an inch end of story so that's going to be the thickness of the bearing we have three measurements taken and we have a week we need an outside diameter and inside diameter and thickness now with these three measurements we can go and look it up in the bearing catalog and order the correct one for the elevator okay that's how that's how you read a vernier caliper in inches and fractions of an inch down to an accuracy over 128 of an inch keep practicing it

Channel: apprenticemath

Views: 369,079

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Keywords: apprenticeship, measuring, instrument, inside, diameter, outside, depth, measurement, linear, vernier, caliper, technologist, technician, trades, math, engineering, ball bearing, Calipers, Vernier Scale (Invention), Inch (Unit Of Length), US Customary Units (Measurement System), Imperial Unit System (Measurement System), fractions, skill, upgrade, Vocational School (School Category)

Id: S_zsEPIN1EI

Length: 22min 22sec (1342 seconds)

Published: Sat Nov 03 2012