Okay, now we're going to be working on the other end of this part. We started
there with facing and cut off so we're going to put it in a three quarter inch
collet. Once again we're going to be we're probably going to go back to 654 rpm.
Tighten this up, here. What we're going to do is we're going to drill and tap a
hole in there. If you look at step number 12 on your process
sheet, okay. So we're going to drill a hole and we got to put a chuck
in our tailstock here. Remember this is the type chuck that's got a tang
on it, so you want pressure back to my right hand side, and turning, okay.
Turn and pull back, there you go. Check it make sure it's in. Don't forget if you go
too far back on the quill on this this can pop out, so I'll always make sure
that's in place. All right we're unlocked here we're going to move up here.
So first thing we're going to do, we're going to use a center drill some people
call it spotting drill. Actually a center drill
can drill and countersink at the same time. And we're going to center drill
that. On your process sheet it says as wide as 3/8 - what they're talking about,
we're going to drill and then we're going to come out the taper on that
particular drill until it makes a impression of about 3/8 of an inch, okay.
You can maybe get a better picture of it here. So we're going to come about
halfway up that where it gets into the tapered area. Then we're going to put in
the drill that's going to go so deep and that is going to be a letter q drill. And
how do we know what size that is? If you look at your decimal chart that the
students have it'll say letter Q drill is the tap drill. Now don't forget
when you tap a hole and it says 3/8 or 1/2 inch or whether on a tap which is
this here's your tap right here,okay. You don't drill it 3/8 if you got a 3/8
tap you've got to leave material in there in order to make threads. So this
letter Q drill is smaller than 3/8, okay. But always look at your chart to make
sure you've got the right size drill. The perception and in the thought of that a
lot of times students will okay it's a 3/8 16 tap, I got to drill a 3/8 hole. No
it's got to be smaller and look at your chart it'll tell you that, okay.
So let's go ahead. Also on the depth of your hole and what have you.
This on your quill here, there's like a rule, like a six-inch rule, it
tells you how far are you are. It's 1/16, 1/8, 1/4 inch and like so that's how
you can get your depth, okay. All right, we're going to change our speed. We're
going to go back to 654. There we are.
Tighten your tail stock.
Go in a little ways, back up - called pumping, get the chips out of there
Basically what we want when we get into that tapered area of the drill,
we actually want that diameter bigger
than what the size of the tap is because we don't want to come back and have to
countersink at deeper later on, because then you throw a burr back in the hole.
Okay, we're not quite 3/8 area yet.
We're exactly 3/8. Lucky guess, right. Okay, come back let's take our drill out,
Now we're going to put in our drill,
tighten her up, and we're going to zero up here at one inch. And it says on your
process sheet we want to go one in 1/8 inch deep, okay.
So loosen up here, run this in, okay right to the straight part of the drill not on
the taper. And tighten this up and we're ready to drill.
Same scenario.
Pump, out, in, out.
Okay, now I'm looking at my rule on the tailstock here for depth.
Okay, there we are - we got our depth. Now if you look at this you see that
countersink line and that's the reason why I went as deep as I did. So now I
don't have to go back in there with a countersink and make that bigger, okay. Do
it all in one operation. Okay, we're gonna remove the drill. This here is a tap
wrench. Okay, it holds a tap. A lot of people think that once you drill a hole
in a block or in something around, or what have you, you can go and start this
tap in there and do it by hand, okay. The problem is trying to get this thing
straight - is a problem. And sometimes by the time you get the threads started
it's crooked as can be. So there is a way to get it in there, okay. So that you
don't have to worry about that problem. So we're going to take our drill chuck
out and we're going to put our center back in. And what it is, is this center
matches up the hole in the tap wrench so that's what's going to straighten it up, okay.
So you don't have to worry about that. So we're going to put this in and
remember this has got a tang on it. Some of the lathes here don't have a tang, so
you're going to put it in, pressure back, and it pops in, now that's good, okay. When
we're tapping we have what we call tapping compound. Put some inside here. We
put some on the tap. It lubricates it so that you don't break it, because they're
they're a little bit touchy, fairly easy to break, okay.
So we can get this out of the road if we don't have enough room. And it looks like
we got plenty of room. Okay, so what we're going to do now is see how much room we
need here, tighten her up, put this against it,
okay, come up against it right here, now it's straight, okay. So now it was a
little room there, we got pressure on it, turn it a little bit, turn this a little
bit so it follows the tap in there, turn it a little bit, turn this a little bit, a
little bit, a little bit, a little bit, now that taps going in there dead
straight. so after you get the hang of it you can do the two together, like I'm
doing there. Okay, now once that gets in there about a half
inch deep, you can even back this off if you want, okay. Because now it's got
enough threads in there it's going to go straight.
Okay, you can get rid of this now if you like. You want to leave it in here you
can - it's not necessary but you can do that. Take us out of your road. One thing
you notice we've been moving this in and out a lot, but from a safety standpoint I
have seen in the past this thing pulled off of here, because if it does this
thing is very heavy, okay. Alright let's finish this up and you'll be able
to feel when you get near the bottom.