00:00Hi everyone just a quick video on micrometers or micrometers as some people call them
00:05what they are what they do and and how to measure with one so what are they first of all so they're
00:11a measuring device that will measure down to two decimal places and it only does external
00:19thickness of a component so what you would do is you put your item that you want to test in here
00:23for a mechanic it might be a brake disc or a brake pad something like that and then you clamp it
00:28together it'll measure the outside thickness so if you've got a component that wears down and gets
00:32thinner over time this is the tool that you might use to test it test for its thickness first couple
00:38things to mention different micrometers micrometers have different gauges so this one is a zero to 25
00:44millimeter one whereas this one here is 25 to 50 millimeters so bear in mind if you're going to
00:50purchase one the thickness of the materials you're most likely to be measuring and make sure you buy
00:54the appropriate one for you so how do you measure with it when first of all I'm going to get myself
01:00a component and I put this into here so what I've got is a magnet here just so I don't have to hold it
01:06and all I'm going to do is close this up here don't clamp it too tight just clamp it so it's firm but you
01:15don't want to over tighten it so here we go
01:21so now that's again just nip it not too tight you don't to damage the micrometer so I've clamped this here
01:32on there and now I'm going to have a look at this so if you look at the the top scale here is in
01:36millimeters and you can see they're dashed all the way along and then the bottom line here represents
01:420.5s and then what you've got here on the the thimble here is measurements right round from zero
01:50here right round to 49 and then back to zero again so there's 50 here as well so when you're measuring
01:58you've got your whole millimeters which are self-explanatory and then the 0.5s there so if
02:04your 0.5 is visible after the whole number then this will represent 51 to 99 if the whole number
02:12is the last thing you see then this will represent 0 to 49 and then obviously your 50 starts here again
02:19so let's just clamp there measure this one so we've got 15 plus 1 2 and I can just about see the whole
02:26number so in this case 18 and then on this sleeve here I've got 0 right round 2 10 15 16 so the thickness
02:39of this little magnet I've got here is 18.16 so we've got 18 in the whole numbers and then I've got 16
02:52or 0.16 of a millimeter on this collar here if I saw a dash after the whole number then it would
03:00automatically become a 5 and then I'd be adding 16 to that so if it was half a millimeter wider it
03:06automatically become 18.66 but because the whole number the last thing I can see here that makes it
03:13this not 49 not 51 to 99 okay so the components of it and that's simple as that so the components of it
03:25on the micrometer what we've got here we've got the ratchet we've got the thimble
03:33the sleeve here the body sometimes called a c frame obviously because of its shape got the lock nut this little section here
03:54and then the most important two bits we've got the spindle
04:02and the other section here that clamps against is the anvil
04:09and sometimes you may get a zero adjuster on the end here it doesn't on this particular one
04:14should it ever go out of out of scale so yeah what's the micrometer then so it'll go to two
04:22decimal places it'll measure the external thickness of a component and the way to measure it is the
04:28hole numbers the zero or 0.5s and this represents the half millimeter either 0 to 49 or 50 to 99
04:39hope that makes sense see you on the next one
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