hello welcome to Enots engineering i'm Alan
in today's video we look at some parts from banggood
the parts i have are this protractor it's got wynn's on it
so i'll have a look at that
also a set of er32 collets
well nearly a set
it was purchased as a set of nine
but obviously if you're going from two to twenty there's one missing
so we'll have a look at that see how they run
and see if they're any good and also today
the parcels arrived this is next week's project
and i'll give you a clue it's from hemingway kids
so we'll see that next week
let's go to the workshop see how they work
now here's something i've had from banggood
it's a simple protractor and i say simple because there's nothing
complicated on it there are no vernier scales or other
things to take into consideration what you see is what you get
it has the name of wynns on it
and this is made of stainless steel
and it costs about five pound thirty
on the rule it has a metric scale marked one to fourteen centimeters and on the
protractor it goes from zero to 180 degree
so we'll take it out the packaging and there you can see on that the scale
is clear this parts made from stainless steel
you can see each degree marked clearly if you have good eyesight you
could probably get to half a degree with this
now if i compare this with one of the protractors that you get in
the combination sets
you can see the scale on the protractor
is not as clear the degrees are thicker lines and the zero position
is probably about two degrees thick
so it's difficult to get an accurate reading with this type of protractor
this one would give you an idea of the angle
but the wynn's one you can see it clearly it has a 45 degree mark
on each side with the little arrow 90 beat in the center and it goes above
90 and below 90 on each side
i found out this angle block and the angle on this block is 41 degrees
so if we put the protractor on we can
set the protractor to the angle move it around till it's
level on each face and it's touching on both sides
then the angle can be read off the scale and it says 41 degrees
if you wanted to measure the angle of this cutting tool
set it on each side
adjust the angle and you can read the angle
and it says
57 degrees
so nothing fancy just a basic protractor with the clear scale
now the next item is a set of ER32 collets
i say a set but it goes from two millimeter up to twenty
and you can see there's one collet missing the 14 millimeter collet
they go 6 8 10 12 16 18 and 20. so the 14 millimeter one is missing
but it's sold as a set of nine and not a set of ten collets
so if you needed a 14 millimeter collet
you'd have to buy that extra so what we'll do is we'll take a collet
and we'll try it on the lathe they should all be roughly the same
i have a bar of 50mm silver steel
so we'll take the 16 millimeter collet which should be 15 to 16.
i haven't opened them yet
15 to 16.
you can see on that collet it is marked up
on the top here 16 to 15
the finish looks good i think sometimes these collets can be rough
it's a very finely ground one
and even the bore looks okay on the collet
so we'll take that to the lathe fit it into an er32 collet holder
and see how true they run
this ER32 collet holder has a number three morse taper on this end
we'll put that in the
just fit the draw bar on the end
bush on this end to centralize the drawbar and then the nut on the end
i'm using my dial indicator as you see here each division is one
tenth of a thou so from zero to ten is one thou
set this up in the bore
now some months ago i ground this bore to
in the headstock so now it should run to zero
but obviously every time you take it out and put it in
Its slightly different so we'll check first what the run out is of the bore
the run out of the bore is three tenths of a thou
i have the speed set at 40 revs per minute
the set that i've just bought this one is
you can see it there 15 to 16 millimeters
so i'm using it at the smallest end of the collet size
you can see there's quite a lot of play in that
it's locked up let's check what run out is on here
15 millimeter bar with the run out at
three tenths
okay we'll try this collet which says nine to ten millimeters and i'll try
this the other way this time on the top of the collet size
at the 10 mil bar
that's running out at
four tenths
i'll try this one which is a five to six mil and i have a six mil bar
so it's the top size
let's lighten this up one thou and about three tenths
on the six millimeter bar
okay so what's the verdict
well the accuracy of the collet will also depend on
the collet holder you're using how accurate is that
in the machine that you're using how accurate is the nut that you're using
because it's not always the collets that are at fault
they're collets ER 32 they're metric
the collets i'll have to use a few times before i really say
yes they're good or no they're not
you can't tell just by doing that quick check on the run out
obviously
it needs to be a practical use
the protractor what you see is what you get
it's clearly marked out
i can read it better than the other protractor i had
the lines are thinner you could probably get to half a degree
if you need to be more accurate than that then you need to buy a protractor
with the vernier scale on but for the price
i'm pleased with it does what it's supposed to do
oh well that's it for today hope you enjoyed it hope it was useful
and we'll see you next time on Enots engineering