i learned this in my auto mechanic class, after 2 years i thought i was never going to need to use this skill. Turns out I am going to have to learn it all again if I want to work for Tesla Motors.
I don't understand the second reading of the vernier caliper. What do you mean when you say determine which division line on the Vernier scale best lines up with the division on the bar scale?? 3:25
There are 4 scales on the caliper. The top one is the imperial Vernier scale, ranging from 0 to 25 (thou). The next one down is the imperial bar scale, ranging from 0 to 6 (inches). The bottom two are metric so we'll ignore those. Notice there are 26 tick marks on the top scale (0 plus 1 thru 25). Most of those marks do not exactly align with a mark on the bar scale. In fact, only one of the Vernier scale marks will align with a bar scale mark. That's how this thing works. The one that aligns is our guy! That's how many more thou (aka, thousandths of an inch) we add to get our measurement. In this case, since the 5 mark is the one the aligns with a mark from the bar scale, we add 5 thou (equivalently, .005") to our measurement.
I've been trying to look up instructional vids to send to my brother as he is a new machinist who lives out of town. This, however, will not be a video I send. Unfortunately the second reading he gives on the vernier caliper is erroneous. The 0 on the vernier scale is clearly under the 2, meaning that the reading will be less than .200" The bar scale is blurry but it is obvious that the 10 is not lined up with any number on the bar scale. Looks like the bar scale lines up around 16 which would be added to .175". This would give you a reading of .191"
I hate The Vernier scale, you have to use a lot the Eyemeter(your eyes) and Eyes arent to be trusted whit such tiny lines. i ask, i am a Tester Technician and i dont get the use of that traditional Vernier compared whit the Dial caliper and the Digital or the Micrometer(external parts) or even better the Digital caliper. one simple line mishap and it could change all of the Test an din turn the product. Does the Vernier have something that the other 2 dont?
I despise vernier calipers for this sole reason. However there is a *slight* chance that a dial or electronic read out can become off ever so slightly. In our line of work being off by 0.0005 can be a fucking nightmare. Verniers cant have this problem unless the actual measuring surfaces are dented or bent. That being said I'm more likely to read a vernier wrong which doesnt help. Also, I just calibrate all of my calipers on all sides of a 123 block to make sure they're accurate. Problem solved
@@-OokySpooky- "However there is a slight chance that a dial or electronic read out can become off ever so slightly." Hence why, when working to a couple of thou or less, I go to a micrometer.
I'm confused by the first reading of the vernier scale (for external measurement). It seems to me you are reading your numbers from the top scale, which is metric, but interpreting it as "inches." Help me understand, please.
