how to use a vernier caliper

now we'll work with a vernier caliper the way this works is that there is again an upper and lower scale here this is the centimeters 0 1 2 3 on this axis here and then on the upper we have inches which we're going to neglect for use and then this is the lower scale down here is 0 1 2 3 up to 9 and then 0 again is the minor scale when it's shut the vernier calipers and measuring anything that is then the zeros on the major and minor axes line up so we can see that this 0 on the minor scale and this on the major scale they line up quite well and you'll notice no where else does that occur that is that the markings on the minor and major scale Linna except again at 0 here and there we'll put our measurement object here between the teeth of the vernier scale and we'll close it when we're measuring something there's a flat side here and we'll want to put our device in that and then close it with a little bit of pressure and then with that value we're gonna see what the measurement is on the major scale it's the question of where does the 0 on the minor scale line up with the major scale so here we have a 0 on the minor scale which is a little past this hash mark here so that's 5 6 7 it's a little more than 0.7 centimeters the question is how much more than point seven centimeters is it since the zero here doesn't line up with the major scale exactly we need to find where on the minor scale it does so there's no match here until we reach save this 6 value so I'm a minor scale the 6 mark lines up pretty well you could even say the 7 mark lines up better so we'll take this 7 as our minor scale measurement now the question is how do we combine this 0.7 centimeter measurement I'm the major scale with the seven mark on the minor scale the answer to that is over the far side of our caliper there's a little marking that says 0.05 millimeters this tells us the smallest unit of measurement for the caliper so now when we look back this zero on the minor scale is somewhere between 0.7 and point 8 on the major scale so this gives us some confidence that our measure is correct now that we know the smallest unit of measure on the minor scale is 0.05 millimeters that tells us what this seven means each of these small marks from here to here is 0.05 millimeters and so since this this is 7 and then there are two marks per increment there are actually 14 of these small measurements the way we'll combine these sets of measurements to 0.05 millimeters on the minor scale as the smallest measurement with the major scale of 0.7 some meters is we'll take the major plus the number of minor increments in this case 14 and then multiply that number times the smallest measure so what we get back after we convert to the correct units of centimeters in this case is 0.7 7 centimeters with an accuracy of plus or minus point zero zero five centimeters as a check this makes sense because the values should be between 0.7 centimeters and 0.8 centimeters and if we look back at our original measurement we see that our zero mark on the minor scale is close to the point eight so point seven seven centimeters make sense now as an example of what happens if our scale is slightly different if we're using a different measure and I may come up on the case where the zero on the minor scale lines up with an increment on the major scale for instance now I see that the zero on the minor scale lines up very well with one point seven on the major scale what that does for our calculation is we still have a major scale of one point seven centimeters but now our minor measurement is zero increments and we multiply that times our smallest measure of zero point two zero five millimeters and what we get back is a more precise measure of one point seven zero plus or minus zero point zero zero five centimeters

Channel: MSTCouncilGradStudnt

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Id: 4hlNi0jdoeQ

Length: 5min 3sec (303 seconds)

Published: Thu May 10 2012