4/17/2021 0 Comments Parts Of A Vernier Caliper
To find out what the error is you have to read the Vernier scale backwards from 10.The Vernier caliper is probably the most widely used of the precision measuring tools in most engineering workshops.Vernier calipers come in two main flavours: manual and digital.
However, we will only be discussing the manual version in this article; as once you can use the manual one, the digital one is self-explanatory. If the zero had been closer to 25 mm then it would be between 0.5 and 0.9. Each numbered line on the Vernier scale will be between two lines on the main scale. You need to find the first numbered line on the Vernier scale whose closest line on the main scale is to the right. ![]() Therefore, the first number after the decimal point is 0.3 0.1 0.2. There are 4 short lines between each one tenth lines, therefore each of these short lines represents 0.02 mm. You are now looking for which of the short lines between 2 tenths and 3 tenths line up best with a line on the main scale. Getting an accurate second decimal place reading can be quite tricky as the lines are all so close together. A lot of people teach this using a diagram with the lines all nicely spaced out to make it easier to read. The reason I chose to use a caliper was so I can highlight that you need to be very careful when finding the second decimal point value. Thankfully for a lot of jobs a single decimal point is accurate enough. When you are using the imperial scale the main scale gives you the number to the left of the decimal point and also the first number to the right as well. On the main scale the big numbers represent whole inches and the 0 to 9 in between are tenths of inches. Each one of these lines represents 0.025 inches. The zero on the Vernier scale is between 0.025 and 0.050 which gives us out next reading of 0.025 inches. Parts Of A Vernier Caliper Free To WorkIf you are still not sure feel free to work through the examples again. Dont be disheartened if you didnt it does take a bit of practice. My own Vernier caliper for instance reads -0.06mm, this means that I have to add 0.06 to every measurement I make. If you had a caliper that read a positive value, say 0.04, you would have to subtract 0.04 from your measurements. All you do is make sure the jaws are clean, slide the caliper closed and take a reading. Once you know the error it is worth writing it down and sticking it on the back of the caliper. That way anyone who picks it up can easily see what the zero point error is. The readings are fairly obvious as they are exactly the same as measuring a normal part.
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