hello welcome to enots engineering i'm Alan today's video we take a look at some
blue nano coated small hole boring cutters they go down to two millimetre and up to
eight millimetre and they're sold separately so let's go to the workshop and see how they perform
these are a set of boring tools from banggood sizes go from two millimetre three four five six
and there's an eight millimeter but i couldn't get hold of one they're made from carbide
with the blue nano coating and they're classed as a small hole boring cutter now with the
camera i can't get any closer than that so to get a better magnification i'll get the
microscope out so we can have a look at one of them i'll take the middle one in the range
we'll have a look at this under the microscope and then i'll put it in the milling machine
and see how that cuts well that's a view under the microscope and you can see
the cutting tip is on the left hand side and that's the cutting face
so i'll just use a spot drill just to mark where i want to drill a hole
i'm drilling a four millimeter hole
then we'll fit the boring cutter on the milling machine and see how it bores
speed that up it's a bit slow
now that's a four millimetre hole and if you look at the bore you can see it's quite a rough
bore so i'll be surprised if the boring tool will cut that through and remove all the score marks
now i'll change the four millimeter drill to the five millimetre boring cutter
and we'll take a cut through and see how it goes but remember i'm on a milling machine and i'm
doing the cut by hand and what i will do is i'll put that through at 1000 rpm and see how it cuts
the finish is not too good on the four mil you can see where i started it's a good finish and as
it got down further the finish got a bit rougher but i think that was the drill not cutting through
so what i'm doing now i'm going to change the cutter for the six mil cutter
it's the next cutter so it's it's got half a mil on each side of the board to take out and i've
put the speed up to 600 just in case it was a bit too slow so we'll just try it at that
finish looks okay
that's the finish of the six millimeter bore
the finish is a lot better but it doesn't look it that's the magnification on it
i've just moved over to the lathe and selected a piece of steel which already has a countersink
in the end i'll drill that out to five millimeter and then put the boring tool in
that's a boring bar with an insert this is the tool that we're testing as you can see it's
it's this is six mil it's already half the size of an insert boarding bar
now the first part is just a recess and then it's the second part that i've
bored out you can see the finish on that is really good considering all i did was put the cutter
in a jacob's chuck in the tail stock and fed it in by hand
that's the cutter
so i would say that's a good baore for
the way i did it i wasn't expecting to get a good finish at all with the tail stock
but it worked i'll have to make a small v block to hold
these in a standard tool holder or maybe just a bar that's got the hole in it
but it worked now these are the sizes and length of each boring cutter
the problem is finding a way of holding the tools in the lathe i need to make a holder for those 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