Jewelry CAD Design Tutorial #24: Engagement Ring Design in Rhino 3D


Hello everyone welcome back to PJ’s CAD
class, as an authorized Rhino trainer I’d like to do everything in Rhino 3D
software that possible. In jewelry industry you have Rhino plug-in professional
software like GemVision Matrix and RhinoGold. People often ask me why
don’t you just use them instead of building everything from scratch in
Rhino 3D. There are two reasons for it. I personally use RhinoGold for my jewelry
design since there are a lot of good features for quick stone setting model
but for many start-up designer both programs may be a big investment to start
with. Second if you know how to build a model from scratch you don’t have to
limit yourself design from the library those two professional jewelry program
has. So long story short, learn the fundamental model concept may take
longer time on your learning path but you will be benefits to you in the long
run for your CAD designer career. What I’d like to show you today is build this
engagement ring that is really popular form in lot of a commercial jewelry. And then,
we’re gonna build a six prong heat and building this little bridging in the
middle, and also build the ring shank with a open on the top, and finally we’re
gonna add this little bead setting diamonds all the way around on both sides. The
video might take too long to finish for just one (video) so I would like to separate
this video in two parts. Just in case you’re wondering what kind of display
view I’m using. If you go into this little triangle right here. and you will
see artistic and this is the view I’m using. I usually use the ghost view. Are
you ready? Let’s get started. Let’s start with this 5 millimeter
round stone and then for how to make this stone you can go on the right top corner
there and then you will see the info (icon) there will be a link for my previous
video. Alright so we want to do a six prong (head) on it. First of all, we want to
decide what type of prong size. You can do the round one but the one that I have
is more of the cushion looking, so I want to decided the the prong, I want to
snapping into the grid, so I turn on the grid snap on the bottom. and then
let’s do from the center right there, you can decide whatever size you want it
that since I’m planning to have a six prongs, and this is it’s not super big of
the stone. so I wanted to do is more like a 1mm. So I’m going to type
“1” here, and also type “1”. Now you can choose to have the “corner”, you have
to choices here right here you have a corner is “arc”. Or there’s another very
interest one it’s called “conic” and what it does is give you a little bit more of
the cushion (look) Let’s go to conic and it give you a little bit more of a cushion
looking, and I really like this shape right there
alright so we have the prong right there Now the prong is going to over the
girdle. Ideally, you don’t want it to be too short but you don’t want to be too
long. There are actually two type of models- for rendering purpose and for CAD,
which you are going for casting purpose For the casting purpose, you want to
leave it a little bit longer so your jeweler will have some room to bend the
metal over. Okay, so let me move this in a little bit. You can moving 30 percent
40 percent or even more like 50 percent of entire area, but definitely not over
50% because you’re gonna make your prong really weak. I usually do in between 30
to 40 (%). Okay so that’s the profile for the prong, and then I need to know what
is the shape going to the bottom you want them to have the same (shape/size) I’m going to
use the Gumball. Drag it and tap my ALT key so then you will have a copy there and I’m
going to flip it 90 degree right there. Okay so you don’t want the metal to
touch the culet which is this point part of the stone, and then only close to the
middle as possible. Okay, now we wanted to have a shape, profile for the shape,
and depends on how you like it there are a couple way to do it you can just go
ahead to you know draw the shape that you like. Something like this, from
quad to quad, so at the perspective you can see they are (look) like this. Or you can do
is putting two little tabs, so once here and one here, and then you can use the blend
tool “blend curve” which is right here and then you blend from here to here so
I kind of giving you different kind of profile, and you can adjust it. Okay, that
way is when you have the prong on the other side it will blend better. Let’s
click OK. Alright, so now you can delete those
two tabs. Let’s take a look on the perspective view. So we have this we can
do is using the “sweep 1 rail” and this is the rail, cross, cross section. and then
you hit ENTER, then you will get that prong there. So next step, we need to
make sure it is solid, so we want to do is type a “cap” C-A-P, then I will have a
cap. Now it doesn’t look too nice for the rendering, if you have really sharp edges.
so let’s go ahead to fillet the edges, so let’s go to fillet, and then radius, let’s
type it 0.2. Maybe, let’s give it a try
Alright, so it looked nice over there Alright I’d like to do six prongs. Two ways you can do it. You can use the “polar array” which might be faster or
you can use rotate with the copy=YES. Let’s try the “polar array”. It’s living
under the “transform” and you have “array” you have “polar”. Okay, so I want to type
it -center is at “0” and I want six of them, and 360 degree, so I will have this prong
set. Alright, if you like everything everything look nice to you just go
ahead and Boolean (unit) all of them at once. Alright so now we have our head. It’s
done. It depends on the orientation that
you have, in this case, I would like to have it rotating 90 degree. I’m sorry it’s
30 degree, so that way it will have two prongs touching the shank, which
is more stable than one prong touching. Okay, alright so now that’s
starting working on the ring shank. I’m going to draw a circle and like most
of my demonstration the diameter is going to be 16. Alright and then I’m
going to move this one above the circle. and that’s where the prong is going to
be. Now let’s take a look on the perspective. Alright this is what we
have there the next step what we’re going to do is creating a shank. On the
original one you can see I have this open on the top, and what I did is….
actually I need to draw the curve first. I’m going to create another layer so
it’s not blocking and I’m going to call the first layer “head”,
the second layer I’m going to call it “ring shank”. Alright, so I’m gonna send
this circle to the ring shank . and I gonna turn the “head” (layer) off, so it is easier
for us to take a look. alright, so the first things I would like to do is
creating the “arc”, and they can be anywhere but make sure that you want it
to almost touching the center. Okay I’m holding the SHIFT (key) so I can get the half
circle that’s the arc. The second things I’m going to do is I’m gonna put
another little tab here. Alright, so instead of drawing the
curve, and this might be too fat, instead of drawing a curve, I’m going to use the
blend tool, so we’re gonna use the “blend” It is living under icon here and then
you’re gonna blend from here to here. Alright so you may have something that I
have here. Now let’s take a look on the perspective (view) that’s because the original
two tab they are not on the same place. To fix this problem, you just need
to pick up the curve you want them to be flatten to the Cplane. and you type
“ProjectToCplane”. We want to delete the original one, yes, and then now if you
look at a perspective there are both on the Cplane okay so let’s do it again
using the blend tool. I’m gonna blend from here to here and it looks alright to me
let’s click OK. Alright so I have that one, and since it’s gonna be symmetrical,
so I just need to copy to the other side. and kind of joining it. Alright so the
question is how am I gonna get this curve follow the ring shank. The command
we are going to use is called “Curve from 2 views”. Its living under the “Curve”
command, and then you pick up this curve, and this curve and very quickly you see
this curve. I gonna turn this in the red colors and it’s easier for you to see.
Okay once we have it, we only need the top part. We don’t need the bottom part.
So I’m gonna use this curve to trim the bottom part, so now I have this one on
the top okay Since it’s gonna be symmetrical you can
mirror to the other side but I don’t want to me or everything to the other
side (yet) I want to finish one side and then mirror to the other side. Okay now let’s
take a look on this top view. Now we need to make it into the solid, right? So we
need to create some sort of profile. Let’s starting creating the profile to
make it solid. I’m going to use the rectangular tool and then choose the
“center” so I’m snapping into the quadrant right there. I’m going to use the 1.2 mm stone, so as long as you are bigger than 1.2 mm and
leaving some room for the prongs, then you will be fine. You don’t want it to be
too thick but you don’t want to be too thin either, I’m going to have it as
about over 1.5 millimeters thick and roughly about 1.8 millimeter
and I’m using the corner for “conic” so you can have this cushion looking
surface, I’m sorry- cushion looking corner. so that’s moving this from the midpoint
to the quadrant, so you’re not cutting inside of a ring size. Alright now I
need to move this in a little bit to the center line. so I can make sure that I
can overlapping them. and I’m gonna use the “mirror” to mirror to the other side.
Alright, so let’s take a look on the perspective (view). Alright this will be the
profile for the “sweep 1”. Let’s do “sweep 1”. this is the rail you go from here to
here, and then you got this surface there. it looks alright let’s take a look on
the top. It doesn’t (get) over the middle. Let’s take a look on the stone. It’s kind of cut
into the prong maybe too much, because I do need to have stones over there, so
let’s do a little bit of adjustment. Let’s delete this one, and we want to delete
the red one, because you have so many control point. It’s hard for you to do
the Edit by just dragging the control points, so we want to edit the original
one. So let’s pick up all the point that you’re going to move. And let’s drag it
back a little bit. you don’t have to drag it way too much. We just need it to be
shorter so there will be a gap there. Let’s take a look on the “curve” (menu) when you
have “curve from 2 view”. This curve and that curve. okay it looked like it has a
good shape, but let’s take a look first. “Sweep1”, cross-section, and
look like it’s alright. okay so now we have this one and again
just not confusing. I’m going to use this original one to trim of the bottom curve.
Alright so now that one look okay. It is touching the center stone. Let’s
take a look how do we create a bottom one. I’m going to have this curve and
going to copy that curve, snapping into the quadrant to the quadrant of my ring
shank. Alright and our front view has a little profile right there. and
we are going to use the “rotate” tool to rotate it 90 degree. Alright then let me
go back to the perspective and that’s hide that one so we need to have those two profiles
sweep to the bottom, so you will have a very nice blend, and so we need to make
that two into one. Let’s go ahead and trim off those two and while they are
select, let’s join them, and don’t forget to mirror that to the other side all right now it’s time to do the sweep
again. Let’s go to “sweep1” and you will go from here to here to here. Usually I
like it to align to the center of inside of the ring shank, and make sure that they are pointing the same direction. so I’m gonna
go this one for in the same direction and let’s take a look. Alright,
blend it really well. It’s tapered down to the bottom and let’s turn on the par
we just did. Alright, it looks really nice as well. Let’s go
ahead to mirror that surface to the other side of the ring. and lets
joining together so now you become solid all we need to do now is building a little
bridge there so it’s more comfortable on the finger. So I’m gonna use the bottom
profile again on my front view and then I’m going to rotate it to
somewhere inside of that shape. Okay I’m going to turn into the red color it’s
easier for you to see. Let’s take a look on the perspective (view) now you see the profile right there, and
we can create a bridge, but I do not want the bridge is too fat. so I actually want
to scale 1D down. So let’s go to “scale” tool use “scale 1D” snapping into the
quadrant to the quadrant, and it’s kind of bring it down. So make sure the bottom is
still stay on the shank. Let’s go ahead to mirror this guy to the other
side okay so all we need to do again it’s going to
be “sweep 1”. This is my rail and I’m going to sweep from this curve to this
curve. Okay so now we have something on the bottom for our heat to sit on. so
that way you don’t have to be realized on the head to holding the shank and
don’t forget to cap this one because that’s only a surface, open surface, and
for aesthetic purpose I might need to move the head just a little bit up. Alright so
I have definitely enough room for my stone to run through. Alright,
so that’s the basic ring shank that we have…. Wait minute, I see this
surface in between, and it is okay for the rendering but not too okay when you
wanted to print it. So Let’s fixed that. Let me turn the head off
all right so I don’t know if you see what I see there, but it’s it’s
overlapping surface, so we need to trim that. If you want to…. let’s explode it. so
back to this part and separately. All the bottom we can join back together. They
don’t have problem okay so I’m going to hide this one, so you
probably will see better what I mean there. Because we overlapping
the the profile a little bit so you got double surface there right. if you say
I’m going to trim this guy. I want to trim. It doesn’t let you trim, right?
so it doesn’t work, so the way to do this you have to split your model first. Let’s
take a look on the top view and that’s draw a curve, like the across our
model, on the top view. I’m going to use this curve to split the them into
four different pieces so that’s use the “split”. Those two will be split by this
curve, so now you have multiple pieces ,right? and we no longer need those small
ones, so we can just go ahead and delete that small one. Oops, this one, and also we
can delete it. All we need to do now is joining those pieces back together. Alright,
and then let’s take a look on the bottom. Just turn back the bottom, and
let’s join those together. Alright, now in our properties says right here is a
“closed solid polished surface” so which is good. With this one, and this one,
that’s also “boolean” it together, and then double check again.
it’s closed solid polysurface. Alright, so let’s go back and turn on the head
there. Alright, I don’t want to join a head yet because I might need to have a
completely surface to do my stone next Alright so this is the basic shape of
this ring so next step we are going to do the bead setting on the ring shank all
the way around. So stay tuned It will coming up for the following
Monday. I hope you enjoy the video please like and comment
and share my video. It takes really long time. Roughly about 5 hours to make a
15 minutes video. So your help on sharing and also comment is helping me ranking
on YouTube. Thank you for watching see you next Monday

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