Spinning ring is really playful to wear. Today, we are going to talk about how to
CAD model for a spinning ring. We will discuss, number one, the size relationship
between the base and spinning rings. Number two, the pattern design on the
Rings. let's get started!
if you search in a Google image. You type "spinning ring", you're going
to find out. Basically they are two types of them. One is this type of flare
out on both side, and a lot of them is handmade so you can see a lot of texture on it.
It's played with texture. The other one is more of commercially done, and you
can see it's more like a ring band style. Whichever it comes up and always have
the edge is higher or a larger size compared to the one in the middle for
the spinning. So let's take a look at our model. Basically in the commercial setup
you're going to have whatever inside and then have this gray ring been made, and
solder a ring on this side to stop the inside ring incoming out. Let's take a look
on this purple one. This purple one is representing the spinning part. Let's
take a look on the right view. As you can see the profile right here is exactly
touching the wall of the base ring, if your CAD model in this way, the ring is
not going to fit because you have to consider after casting they may shrink a
little bit. Both ring will be shrinking, but you
rather to give a little bit more room. With that saying, if I'm doing this for
casting I might need to have a little bit bigger. Now the question is how big
should I have. If I have it too big, it is kind of running around inside. If I
have it too tight, it will be just spinning. It is up to you as you can see
I found a Google image some of them is really loose like this one and the
design is for it to spinning a lot. My suggestion for you is if you wanted to
have the spinning tightly, I would suggest you have 0.5 millimeter
larger in the diameter so you will spinning freely, but it's not moving
around. On the other hand we can make it much bigger so it will tilt inside of
your ring. The key is, you don't want the inside diameter is higher than the
edge right there, otherwise your ring will fall out. With this concept in mind, we are
going to take a look on how to make this ring for the production process. You're
going to cast those three rings separately and then you will need to
slice the green one and the red one open. Put it in there and solder it back.
Let's start with the front view. We want a circle for diameter 16 millimeter as
usual, and we want to go to the right view. In the right view, we want to create
an arc on it, you can make it as thick as possible, but be careful if you have it
too thick you may reduce the ring size in the sense, so always need to consider
measuring in the wider ring size to get the proper size, so that's is the arc
that I have, and I want this copy and paste
I'll hit Ctrl-c and Ctrl-v, and I want to move it up 2, so the ring will be 2
millimeters thick, and then I'm going to put this curve here and then
join them. While I'm join them, I also wanted to make sure the edges nicest and
round, so I want to use this command. It's called fillet corners, so they're now
gonna fillet the corners for 0.5, and they will be nice and round. Let's take a look
on the perspective view, To make this ring is quite simple. We are just gonna
using the surface tool, and then you have sweep one.
This is rail. This is cross section, and I always like to move the seam to the
middle of the ring shank, inside of ring shank. Then I will get the shank like
this. Okay, now, we need to decide where is the design area that I'm going to have.
So what I'd like to do is I'm going to copy and I'm going to paste. Ctrl+C and
Ctrl+V and I'm gonna hide one of it. so that way I will know if I
accidentally do something on this, I will always have a backup. Alright, then, I'm
going to starting a square, and let's say Center is zero, and this is like how big
of an area I want my pattern in there. Alright, so that is where the pattern is
going to be. I'm gonna use that square to trim the rest of it, so that leave me two
of these surface, and we don't need the bottom one, and we just need the top one.
We don't need this square either. So what I'm doing here is I'm trying to find an
area that I'm going to do the design with. Let's take a look on the top view
and go to the Curve- Curve from the Object, and you have Create UV Curves.
then we want to hit on this one and all of a sudden you see this is so many in
lines, and I don't know which line I was supposed to work on it. It's because the
Rhino remembers the history of what the surface was, so instead of doing that
lets do a command. it's called "shrink trim surface", so once
it you click on that. Nothing happened. but something happened in the
backstage. So let's click on this one. And we wanted to create UV curve again
so let's create UV curve and then all the sudden, you only see this space right
here to represent this area. So we no longer have that weird things, you know,
coming out and get confused, and actually that wasn't weird things, it's just
Rhino remember what was it in the history. Ok so now let's do a pattern
design. The pattern design that I'm going to have is quite simple, and I'm gonna
use the conic rectangle tool, and then I'm gonna click on and remember that the
Grid Snap is on, so I'm going to create a rectangle, and it looks something
like this. Ok and then, I'm going to also using the circle tool. Let me turn off
the grid snap, so I can control whatever size that I want. I'm gonna have
something like this. Alright with that, I'm going to copy that one. Let's say
copy from the quadrant on to all the quadrant there. Alright, and then I'm going to
use the trim tool, and let's trimmed off the one in the middle
so then we have this kind of pattern. Hit ENTER, and while it is selected, let's
hit Join. So now they join into one curve, but this is really sharp
Remember, when we want to cast it we always want to have like a little bit
radius there. Just make sure that we don't have investment cracking
on this sharp point, so let's go ahead to use the Fillet Corners again, and
we want something really small so let's say 0.2. That looks good there, alright.
This is gonna be my pattern, and then I'm going to have my pattern kind
of repeating to whatever length that I want, and I may need to have it a
little bit smaller. Okay so now, let's move this one to somewhere here first.
and we are going to use the array tool. You have the one on the first is
called Rectangular Array, the rectangular array command is going to ask you to
pick up the object, so we're gonna pick up that one. We will need more than what
we need, so I'm just gonna type it like 30 there, and then for the Y direction I
want to have two rows, type it 2, the Z is 1, and then that's hit ENTER, they were
gonna ask you for the first reference point, so that will be our first
reference point, and the Y for the second reference point, so you are going to get
something like this. it is more than what I need, but that's okay, because we're
gonna delete bunch of them. Let's go ahead and delete those. I rather to have
more than not enough. Now to arrange these things on the top, we kind of need
to understand how are we going to make the pattern continue it, so I'm
going to group them first, and I'm gonna use this align tool and align to
the centers, so now they are aligned the center. Notice that, two of them is
hanging outside. So Ungroup them. I'm going to delete it this one, and delete
this one. The thing is, if I move this one to the left a little bit, and
that is exactly half of the distance to the
other side, which how am I going to do exactly the same? I'm going to measure
in between here and here, and that's 0.58, so I'm gonna draw a
line right here, and from here this point is 0.58/2, so that give me a distance right
there. so I know that my my curve on this, I should move it right there, so that
will be exactly half. That mean on the other side they need to be exactly half.
I have two stick it out, so one of the way I can do is I can move it this back
here one more time, I need to do a reference point here as well.
0.58/2. Alright, so that's the distance. Moving back from that point
from the edge to that point. Alight so that means this will flow to the other.
and you might have a question. isn't that change the proportion of
this guy? Yes, it will, but it's not gonna tell that much. It's because they are
going to be stretch anyway to back to this surface. Okay so now I have
everything let me delete that little bar there, and delete this one here. So now we
want to select everybody. We want to go to the right view, and let's go ahead to
Solid- Extrude Planar Curve-Straight, and this is like how deep you want to cut
it into it, so I'm just gonna type it 0.6 there.
because we just want to have a look there, we don't actually need to cut
really really deep. Alright, so now we have this, we can flow it back. One more
thing you need to do. Go to the top view, then you are going to go to the surface
tool, and then you can pick this surface from planar curves. So this is in the
plane area, we want to make it into the curve. You also may notice that one
thing that I did is, when I extrude it, I select both sides. The reason is I want
to make sure it is intersected with the ring. I'm going to cut into. Okay so
let's take a look on this. We are going to use the command. It's under the
Transform you have Flow Along Surface, and then you want to pick up all of them.
and then you want to hit ENTER. It will ask you where is the base surface, which
is this surface is sitting. It will ask you where's is the target surface. We want to
select close to the seam. so now we get this right there. You can see it's
very nice distant in between those two, compared to this one, and the rest of it.
Because we arranged it in the right distance over there.
Now we no longer need the surface. Let'd turned on what we had
there, and it's time to do the Boolean Difference, so we wanted this be
differences out from those cutter. Alright that works. If it is not
working for you and you have Close Polysurface on both the cutter and
also the ring. Try to do like fews at a time. Maybe it's just because your
computer running really slow. We will finish the rest of the ring in next
video. Don't forget to check out the other videos, that you may find really
useful information there see you next