Alright, the next video here in the series on precision measurements is using feeler gauges,
the different types of feeler gauges, and flatness measurements. So let's talk about feeler gauges to
begin with I have four different types of feeler gauges here and let's talk about each each
one of these so the first type of feeler gauge I have is one that is angled I bought these
from craftsman years ago and they just have a nice angled edge on them for getting into tight places
it starts with the smallest feeler gauge of five thousandths of an inch or 0.127 millimeters
and it goes all the way up through 30 thousandths of an inch or 0.76 to millimeters with these you
can stack some together if you want to come up with a specific thickness to use to measure the
distance between two points for example so I've got a steel play right here if I want to see
if it's if I want to check to see how flat it is with the set of feeler gauges, I am going to use a
special granite block that has been ground down to the ten-thousandth of an inch this is from Starrett
let's see it's Starrett true stone technologies and it's just a piece of pink granite with a nice flat
top it works wonderfully so if I set this steel plate on here so I if I want to see how much the
clearance is to see how flat it is I'll put some downward pressure on it come in with my smallest
feeler gauge and see if it'll go under anywhere here along the edge of this plate and it will not
so five-thousandths of an inch we know will not fit but that doesn't mean that it's totally flat
so there's an even smaller set of feeler gauges that I have here this is from Blue Point Snap-On
part number FB310B and on these it has little thumbscrew that locks down and keeps the
delicately little feeler gauges from falling out we're gonna open that up a little bit to relieve
the tension pull out the feeler gauges and this one, the thinnest gauge is sandwiched between real
thick one of 15 thousandths and the next gauge down we need to really open that thumb screw so we
don't bend this this is one thousandth of an inch point zero zero one inch if we stacked a thousand
of those together it would equal one inch so let's take this one-thousandth of an inch feeler gauge
and now see if it fits under and it does not and so that tells us that this steel plate is really
flat as it should be and for some transmissions you check for flatness of of steel plates and
you're going to want to check at several locations both the inside and outside just to make sure that
it doesn't fit or if it does we'll the one go in there's a one and a half in this set
of feeler gauges, there's two three four five six seven eight nine 10 11 12 13 14 and 15 so clear
up to this goes from one-thousandth of an inch to 15 thousands of an inch. To store these properly I
need you to tighten back down but not super tight just snug the little thumb screw there so that
they don't fall out on their own and get bent up in the toolbox so we've looked at a set of angled
feeler gauges for getting in tight spaces we've looked at a set of real small feeler gauges and
then there's also I've got a set of brass feeler gauges so I've got some brass feeler gauges here
that go between let's see the smallest is six the highest is 16 thousands of an inch these
can be useful if you have to put a feeler gauge somewhere where there's a magnetic field and you
don't want the feeler gauge sticking to the magnet to the magnet so we've got brass feeler
gauges that are available and then the last set of feeler gauges is from Snap-On's Blue Point and
it's part number FB322 and this is just a straight set of feeler gauges but this one is
unique because it actually has two feeler gauges in one and let me zoom in so you can see this this
better so this particular one has a twenty-five and a twenty-seven thousand speeder gauge on the
same piece of metal here so this little tip area out here see how it's a different color
the thickness of that is twenty-five thousandths of an inch but then if you stick it in farther
then this shinier metal surface there is the twenty-seven thousands of an inch so I
like this because if twenty-five too small you can push it in farther and see if twenty-seven
will fit so it's two feeler gauges in one it's a really neat set of feeler gauges are like those
alright so we are going to use feeler gauges in the manual drivetrain class for a number of
things checking all sorts of clearances in both manual transmissions and automatic transmissions
manual drivetrain synchronizer in gaps and all kinds of things we can use feeler gauges or here
in my classes, I have these four different sets of feeler gauges, I have several different sets
of them when you're done with them please lock down the thumbscrew wipe them off really well
and put them back in the toolbox all right now for flatness measurements we've got the granite
block here and then a lot of tool manufacturers specialty tool manufacturers will give you not
give you they're very expensive they'll have a machine straight edge right here so this tool
for Miller tools has one edge that's nice and smooth and one edge that's rough and then the
sides are smooth too but it's this smooth edge piece here that is to be used as a flat
gage and you'll stick that across different parts inside the transmission or transfer
case or whatever to take a measurement this smaller one here is a General Motors a version
of the same thing, it has two machined surfaces on it that are supposed to be flat so when you
use one of these in my classes you need to keep in mind that these are precision
machined surfaces and you need to set these down carefully don't be throwing them around because
they can be damaged and of course when you're done with these put them back in the toolbox