Hello everyone welcome back to PJ Chen Design Channel. This channel is about
sharing Rhino3D knowledge to students and professionals learning various
Rhino3d techniques. Today we would like to talk about this 2-tone twist
bangle. Twisting element has been using in the jewelry design a lot. I would
like to show you the little trick and tips that are used for this bangle. Are
you ready? Let's get started. Let's go to our front view, and to draw the ellipse
I'm going to set it the size for 60 by 55. So I'm going to type a 30 here
holding the SHIFT, and click and 55 divided by 2. Okay, so as a bangle we need
to have an opening, and again, the opening is really depends on your
customers wrist, and how much opening they need to allow
wrist to get in. So I'm gonna draw a line in the angle there, and mirror
to the other side, and let's go ahead to trim the one that we don't need. So that
will be our opening. Okay so we need to know how long is this. So let's go to the
command bar and type it "length" Okay, and we're gonna pick up this curve
and it tells us is 150.612 so we're gonna make a curve that is
going from the top view, and it's 150.612 okay so this is like
if you stretch out this curve and how long is going to be. Alright, so we need
to create our design on this curve let's go ahead to creating the profile. Going
to the curve tool, you have rectangle tool and snapping at the
endpoint of the straight line we just created. I'm gonna set it up the length
for 7 by 2, So this is the profile are we going to have. Let's go ahead to copy
that one from the end point to the end point, so we want to make sure that
when the surfaces created at the end, they will be straight. That we want
to control the end. Okay so that will be the curve for the first surface. The
second surface which it's going to be a little bit higher in the middle. What I
like to do is to rebuild this curve, and then make it into the five points (count) and
degree in 3, and then what we wanted to do is to move the point in the center
we are going to move it up a little bit. okay so the first surface we can simply
just using the LOFT tool. We're gonna loft straight from here to here, so that
will be your first surface, and let's CAP it. Okay, the second surface we are
going to do is instead of using the LOFT that we want to use the SWEEP1.
This is going to be our rail, and this is the curve, this is the curve (profile). So we're gonna
have our second one like this. Let's go ahead and cap it so it will be solid as
well. Okay I'm gonna look at it one at a time. So let's go ahead to hide that one
Okay so within this one since it will be harder to do fillet the edges
after we twist, so we want to fillet the edges right now on the 4 corners. I
want them to be a little bit rounded, so that set it 2.5 and that
should take care of this, this one, and this one, and this one. So it's not that
sharp when you try to wear it. okay and then the rest of it, that's put it into
radius 0.8, and we wanna the radius all over, okay so we got really nice rounded
edges there. So when you wear it. It's not scratch your skin. Let's bring it
back the one we just hide and let me put this into other layer, so it's easier to
see. Change the color as well. Okay so we finished that red one let's hide it and
the second one we want do exactly the same things. Let's set it as a 2.5
and pick up 4 corners. After we do that, we want to change radius 0.8
like we did before, and this time we want to select all over, okay so just
wanna make sure there's no negative edges and everything it's fine.
Okay now we have those two if you are going to make one tone which you don't
have to assign different materials, you can go ahead to Boolean Unit them right now and if
you are like to do two tones then you want to keep them
separate without Boolean it together. Let's temporary to group them, so it's
easier for us on the model every time we select both of them at the same time.
One of the important concept about twisting is where to Axis is going
to be, so let's go ahead to try TWIST and a snapping into the midpoint of that
profile, and the midpoint of this profile here. Alright so let's go to the right
view, and that's holding the SHIFT click on the x-axis, and let's do 360 degree,
which is one turn, and let's take a look on the perspective. You look in the
perspective they look beautiful. It's really nice and flow, however, the
problem is the curve that we have supposed to be on the construction plane.
That means any part of this middle part when you flow it back to this surface, it will
be inside of the bangle, and for the jewelry design purpose you always want to avoid
things get inside of the ring shank, or inside of the bangle, because it's gonna
be not comfortable. so we need to make sure that, when you twist isn't
nothing or something really minimal for the bangle. Okay so what I
like to do is I need to find where's the center axis for both of the forms. The
command I'm going to use is called "BoundingBox" so go to the command bar
type a "BoundingBox" and it will pick up your object and you hit ENTER
then it will give you a box. What this box mean is.... this is the maximum area to
cover entire piece. okay so our center instead of where the profile is. It is
actually the center.... let me turn on the end point, so I can snapping into the
corner to the corner, and snap to the corner to the corner.
Alright, so now I'm no longer in this bounding box all we
want to do is finding the center point which will be the diagonal line that I
just draw, the midpoint of that line. So I'm just gonna put a dot there, so
it's easier for you to see so now this is our new axis. Let's take a look what
it's going to affect our twist, we are going to do the twist again, and we
select this object. but this time from this midpoint to this midpoint is our
axes. And I'm going to do the same thing under 360-degree, so now we keep it above
the line possible above the construction plane so that way we can flow
it back better, so now let's flowed this shape back to the bangle. Let's go to the
Transform, and you have "flow along the curve". Let's pick up this one, ENTER, and
you pick up the base curve, and make sure you pick up the same corner at the
same side that you pick on the curve. so then you will have it flow really nice
back to the original curve. I would like to thank you for watching and shareing and
leaving a comment for my video. It's been helping me a lot on my YouTube ranking
please keep doing so. So I can reach more people and share my knowledge with them
thank you I'll see you next Monday