All right now we're moving on to step number nine on your process sheet and
we're going to chase threads. We're going to be chasing threads and we'll do a
little demonstration dry cutting, what have you, to show exactly what it is, but
first of all we've got our compound turned back to 30 degrees which is what
we use for threading. We just got done doing that. We're going to run it a lot
slower speed for threading and that's because there's a lot of pressure.
There's pressure on actually three sides of the tool instead of just one like one
more turning and facing. So we're at 95 right here you can look and see how much
slower. It is very slow also the settings for threading are
different. This handle right here needs to be all the way left. And there's a
diagram on here and this needs to be all the way left, okay, that's on the diagram.
Here's all of our speeds and feeds all right now. We are going to chase a 1/2 20
thread and this right here is approximately 1/2, remember we did that a
little while back. So the other thing is we look at the chart here and we find
number 20 which is our threads per inch so we come down, back up, where we got our
20
So that will give us our 20 threads per inch. This lever down here has to be all
the way over this way again that's on your picture here. All right we're gonna
continue on with the rest of our setup. Remember this is just like any of our
turning and facing we have to get our center height, okay. Same way we did it on
the other sets up. So this point right here needs to be at center height now.
We've already done that. The other thing that we want to check is right here and
we did that on our other step. We're going to run this in to straighten up so
that we got this square with the spindle. Okay, it makes something that we're going
to do here later. Okay, you can see the gap in there. So we're good to
straight there, all right. So now make sure we're tight here, yep. Tight there,
nothing can move on us, all right. So now what we got to do if you look at
this is called a center gage and what that does,
our little threading tool here is at a point and this here has got different
points here that helps us go back and double-check and do our settings here
that that is correct, okay. And I'll show you what we've got we'll double-check
that now to make sure it's okay .We'll bring that out and we come over here and
we lay it against our part like so and we want to fit this into that groove.
We'll crank this out a little bit away from it so that we can get on about the
center of our piece and we go in here and so we're good. So that did help
straighten it up. If you try to do it without this here you can kind of fiddle
quite a lot and it takes probably three to four or five times
longer. This gets you pretty close and sometimes we don't even have to change
it at all, okay. So now we've got everything right we've got our center
height we're actually ready to start threading. So we'll give it get some room
here. Okay, we're going to turn on our spindle
here and we're going to put some paint, this is part of the setup here, on this
area. This is the area we're going to thread and what that is is we got to do
a setting that tells us how far we go in on each time because we will make
several cuts. probably at least 10 15 20. Okay, we got that painted up pretty good.
Now when we do threading you've got a dial on here we have to engage what we
call our lead screw. And this is our dial there's numbers on that dial, okay. And
what it is is any number on there you can engage the threading and that's when
we engage it for example like right now.
When that number comes around it's moving right now when that comes around
you're going to shove down on this lever.
All right, we're starting to move so I push down on it and you want to keep
pressure down on that till it actually clicks in because if you don't you don't
get an accurate thread. So what happens is now we see that moving see how that's
moving and that's what's making your thread, okay. So you only do it on one of
the numbers okay that's when you want to engage it. So next thing we're going to
do is we're going to set our depth so we can
use our edge finder and I'm going to come in here and just try to make a
touch off so we can see. Okay, there's our line on there now it's just starting to
show up. So I'm going to come away from that because each time I'm going to go
back that in that's our original setting. So once we complete our cut I'm going to
move away from it now and let you watch that again. Be patient because wait for
the number coming around you have to wait because if you engage it too
quickly you're going to do what we call a cross thread and you'll never be able
to do it. So we want to make enough cuts that we can eventually put a nut on
there. Now we're going to do what we call a dry cut what you'll give you an idea
what's going on I'm going to pull out on this right here you're what we call our
cross feed away from the part and I'm going to come over here and go back to
zero. Okay, on my readout I'm not going to go all the way but I want you to see you
we're winding down to zero. Okay, I won't go all the way because we don't want to
hit it but you can see what's happening if you can get a shot of the digital
readout.
Remember keep pressure down on this till it goes in.
And then we're going to let that go all the way to the end into the clearance
slot. Remember we're not actually touching. Once we touch we'll take a very
light cut so you can see it better.
All right to save a little time now I'm going to pull that up normally we would
do that in a clearance slot, okay. We're not touching normally you would come out
here like so. Back over so now we're ready to take a cut. All right, let's go
into - okay we're now at zero. So now we're going to make a cut. We're back to zero
we're going to feed in remember we zero'd it up here to, to give us an idea what
we're, cuz this does not show on the readout. I'm going to take about a three
thousandths cut. All we want to do is really get a picture of what it's going
to look like to make sure we're okay.
Come out.
Over here, okay, we did our touch off, okay. We made 1 thousands cut and you can look at
it and see that it resembles a thread, but the way we like to double-check it
is - we've got a thread pitch gauge here and we put that on there to see if it
matches up. And that's just to determine whether we're getting in it and then
fits up okay, that we're getting the proper thread on there, okay at 20
threads per inch. So now we can continue on we got to put a little bit of oil on
there when we do it all right. We'll take a couple more cuts and then we'll go
ahead and see what it looks like. And then we'll come back and take more cuts.
We we won't feed in on every cut. We may take like two three cuts and then
come back and do what we call a dry cut. Where we don't feed in anything right
here. We're going to go ahead now and bring this back to zero remember this
always goes back to zero on your x-axis. Now we're ready to feed in and here's
where we're going to feed in, okay.
We may be just taking a very very light cut if it is we'll come back out. And
always be patient wait until your number comes around.
Keep an eye on it ready to pull your lever up when it clears. Up, now after
you've nothing can happen after you do it up. We've got to crank this out like
so. Doesn't make any difference how far out too much is not going to happen
because you're always going to go back to zero.Now it's safe to bring us across
because you can see we're not going to do any any damage but now we come back
into zero again on the x-axis. So we're back at zero now which doesn't touch
anything but we want to feed in, okay. We're going to take another cut right
here. Bring it over here close get it close but not touch. Be ready for a
number to come around. Once again be patient. We're going to put a little oil
on it. All right, we've got a number coming up right now.
Taking off very little. So you can see what a dry cut does. Come back out, come
back over, come back into zero, so we can't hurt anything. All right we're back
to zero, so let's take a two thousands cut.
Get to our clearance groove, move out.
We're back to zero, feet in, Wait on our number.
A little oil on there.
Okay, I think this is going to be our last cut.
Taking very little so we should be in good shape after this.
Alright let's clean it up good and see if -- wala, we're there. Make sure it was all
the way back to the shoulder, very little shake in it, that's it. That's enough
for threading. Once you get the hang of it it's not really too bad. The key to it
is make sure that at the end of your cut when you're in that clearing slot that
you crank out. I mean you can't crank it too far because it's always going to
come back, you want to come back to zero. And then feed in here, so actually 20 25
31 thousands. Remember I initially said that 32 to 40 thousands is generally where we're at. So that's
it for threading!