hello welcome to enots engineering I'm Alan in today's video we're sharping up a parting
off tool and a boring tool using the tool and cutter grinder now to do this i use two fixtures
and that's because one fixture is already set up on the machine so i can use that to sharpen
some of the boring tool and then we'll swap over to the second fixture which
is used for layer tools so let's go into the workshop see how we do it this is my warden
tool and cutter grinder this is one of the fixtures i made to go with it
and this fixture is the one that comes with the kit
fixture that fits on there so i've got two this one is for an
ER20 collet holder and i have a four millimetre ER 20 collet that will just hold on that diameter
put the collet in
this folds up
tighten this down so the first thing i want to do is align the top of the cutter with the table
i'm just using a rule a problem on this this boring bar tip is that whoever ground
it last time didn't grind it flat it's got like a radius on it so
I've taken about halfway and i've aligned raw with the edge of the table
just by sight and lock the nut up by hand so now i need to turn
the fixture here
to get the correct angle and i'm just going to follow the angle that's already on there
just by widening the tool up to the wheel this is a diamond grinding wheel
looks about there and i'll read the degree off here
it's one two three nearly four degrees you can see the scale of the table
on that
and now the angle i need is the the angle at the back here which is what the table
will set up to which means altering the table height so that the cutter
i've got this set at the moment to eight degrees so i don't think it needs to go any
higher than that it looks as if this tool has been
ground before to more than eight degrees i don't know why just clearance at the back i think
so i'll leave that at eight degrees
now before i start i'll put some some red felt it pen on the end that's better that's
just so it'll show me where i'm grinding i'll lower this down i'll just turn the
wheel around by hand just to get an idea of where it's going to touch and i'll feed it in
just rubs
now if you look at the tip there you can just see on the tip
where the wheels rubbed right on the edge of the tool so that looks okay so now what i'll do
is lower the table down fit the handle underneath so i can move the table
wind the feed back off the wheel
move it in position and that's ready for grinding
and feed the tool in it touches the wheel
the wheel is turning clockwise
you can see on a it's taken a cut right off the front edge which is what i wanted but the back
here still not cleaned up but i'm not worried about the back that i'll clean up the next time
i grind it so what i need to do now is grind the top here to get that edge sharp so what i need
to do is alter it for cutting the front front hedge so under this knob here i can rotate the
tool with the indexing part of the fixture i'll now lock this up
and i can set the angle
i'll set that to eight degrees and lock that
up move over to the tool
move the tool back
i'll do the same again on this or just put some red felt tip on there
bring the lever back in move it to the grinding wheel turn the wheel on and then
move the tool in slowly
and we can see that that the angle that's on there is more than eight degrees
set it to nine i don't want to go farther than that so turn the wheel back on
see on there it's ground from the point to the center and this bit at the back in red
has not been touched that means that this angle on here must have been about 10
15 degrees so i'll leave it at that that will leave a bit more material on
okay i've undone this screw out of here which holds this on i can take this off
i'll swap it for another fixture there's a little peg that goes into this hole
this
goes through here
change the fixture on the top one for the lathe tool
i've set it the other way and now i'm going to feed that into the wheel to grind the top
angle i'm cutting on the other side of the wheel so i'm reversing the direction of the wheel
you can see there it's just clean the top face and that tool should be done there's the tool that i ground
i didn't grind all the bottom just the top edge the top face and the front face
as you can see it's a very small boring tool
and i'm changing the standard
a
jig or holder for one that's
just taking out the
that's for holding tools
i'm just removing that because all i want to do
is use this straight edge this one each side to guide the tool
set this to zero on the protractor
lock that up
this is my parting off tool i want to sharpen up now on a parting off tool blade type like this
you don't sharpen the edges it's just the front face i don't show up in the top on this tool
because i use it for cutting brass and you can get away with some steel put that on the table
move the table forward
to the wheel lock that up
let's check that the angle i've got it set to is right if you look at that
you can see the angle between the wheel and the front face is right
all i want to do is grind that flat across the front face
i want the wheel to go down
now all i'm doing is holding up against that
that face and just holding it in position onto the wheel you can see it's cutting at
the bottom but not at the top so what i'll do put a bit of red felt tip pen on the the
blade the top there the red felt tip
grind a bit more
and you notice i'm grinding the parting off tool while it's still in the lathe tool holder
so when it goes back on the lathe it's perfectly square and true to the machine you can see there
it's starting to grind up this edge but not on this side
okay
you see there's round along the top
and it's just got a little piece missing i'll
leave that because next time i grind it that will come out
so what i'm going to do is rub an oil stone across the top just to take off the the burr
that's at that tool done well there's the parting off tool and the boring bar oh well that's it for
today hope that was interesting hope it's useful and we'll see you next time on enots engineering