3D Modeling is the basis for our
engineering. That is the only place where productivity is paramount.
You can have all the PLM/MBE gurus debating data management, but it
does not add one smidgeon of productivity to the design process.
Top down or In-Context modeling is the most productive
feature of 3D CAD. Most systems tout this but each part is still and
external part. We are talking about a single model of multi-object
design environment. Both of the systems we represent offer this as
the "normal" design process. Thereby increasing your productivity 20
In these exercises I not only focus on modeling techniques, but
also on much more productive systems to do our designs. I hope you
enjoy them and learn something. If you are in management, understand
that all 3D CAD systems are not the same. Cutting your engineering
costs is very simple. Even your legacy data is not a problem. Please
feel free to give me a call. There are millions of man hours wasted
every day with poor modeling techniques and ineffective 3D CAD
systems that cost a fortune. Productive 3D CAD systems do not have
to be expensive.
doing the below assembly for an exercise showing my modeling
techniques and, of course, our superior 3D CAD
3D CAD Modeling Techniques
I saw the following video challenges on linkedin and thought I would
give it a try on IronCAD. I got a great response and decided to do
it in ZW3D. I was very familiar with the parts and it was a bit
ZW3D vs Fusion 360
These exercises started out to show the benefits of
ZW3D over Fusion 360, but
quickly turned into a study of modeling techniques. Take a look at all of
them, they will open your eyes to a much different and more productive way of
modeling. It really has more to do with modeling technique than it has to do
with the 3D CAD systems. I have found that I do 3D modeling as compared to
the conventional 2D sketching. Of course, having a more productive 3D CAD
system doesn't hurt.
ZW3D is very similar to the Pro/e
clones with a few small differences. It is very easy for those users
to get up and running with ZW3D. It has a few operation that
are a bit more streamlined. The benefits over the other systems
are the multi-object environment (top down design) with the integrated drawing. You can
do parts, assemblies and drawings in one file.
These exercises were incredibly
popular and I thought I would follow up by showing more examples of
this 3D modeling technique.
We will be doing a
couple of parts each weekend in both IronCAD and ZW3D. I hope you
enjoy these exercises and hopefully they may lead to increasing your
Please review lesson one:
3D Modeling Techniques ZW3D Lesson One
We will bring up the Center Grinder file:
Since we created this file as a multi-object the ZW3D Manager
automatically comes up. It shows the assembly, the bearing and the
We will select the
center grinder assembly and we will see the existing parts. We will
right click on the Center Grinder assembly and select "insert
component". Again I want to reiterate this is not a true single
model environment. Each part is still like a external reference
except that it resides in the same file.
insert the Bushing as a new part.
Note: ZW3D's Multi-Object
top down design is an incredible time saver. Especially for the
individual design. Which is most of us. Even in large companies a
designer is given a sub-assembly to develop.
step automatically puts us in the "edit part" mode that shows the
other parts as ghosted. They are available for reference as you
will see. We also have the "open part" mode which has only the
single part available. You can make these external individual parts
Note: I have surprisingly found that ZW3D is a
superior top down design program. I have worked with many top down
design packages (There are only 4 that I know of) and ZW3D is
will will begin on modeling the bushing. We are going to design in
top down or in context design. We will go to the assembly menu and
reference an edge.
will go the the shape mode and select extrude. We just select the
reference circle, no sketch required, size it in the assembly. Very,
very productive and simple.
Note: I have to admit there is
only one other program that has this feature and I have tens of
thousands of hours on it. This is by far one of the most productive
modeling features available. No sketch, no setup at all. Pure
being done we now create the hole by inserting a primitive cylinder
and setting it as subtract. We will select the center of the
bushing, set the alignment and size it. (We have the tool tips
shown. You can go to help and it will show you how it is used)
Now for the oil groove. We again insert a primitive cylinder and set
it to subtract, we offset it from the center of the hole to located it and
locate the oil hole on top by again going to the assembly menu and
referencing the top circle which shows purple.
again go the the shape menu and select extrude, pick the circle and
is a step many of you will not be familiar. We will go the the
direct edit menu and directly edit the hole by using the modify
radius command to the correct size, 7/32. This is a very, very
productive function when working top down design. Most would have to
create a sketch then set the diameter. But this is one very simple
We are now done with the part. I will select the Center Grinder
assembly for our next step. We now insert a new component: The
Sleeve. You can see I have change colors for clarity.
select the assembly menu and again reference the mating edge to
start the Sleeve.
the shape menu and select extrude and select the circle and size it.
Again no sketching involved. Incredibly productive.
the back shaft we just create another primitive, center on the edge
of the existing cylinder on the back face, so it can easily be
for the front shaft. Again we insert a primitive cylinder on the
center of the face of the existing cylinder, align it and size it.
Can it be more simple?
have the hole on the bottom. We will sketch this feature since it is
not located by the center of the hole. We select the XY plane and
set the up directs: negative Y
will add the circle in the sketch. I create a vertical line 5/16
long from the center of the cylinder that represents the edge of the
hole. I then create a circle using the center and end of the line. I
will delete the vertical line and exit the sketch.
then extrude the hole. I have to set the view to wireframe to access
the sketch. We select the circle and set the size.
for the last hole. We again go to the primitive cylinder, locate and
size. You are probably bored with this by now. But realize the time
is saves from having to create a sketch and then extrude.
need to add the cosmetic threads.
done with the Sleeve. I will change the color and move to the screw.
I have decided to alter the design a bit since the drawing is
not clear on the screw and how it sets in the Bearing. As we select
the Bearing to edit part, you can see the Bushing and Shaft are now
I will create a .375 X .063 deep counter bore in
the Bearing, again using the primitive cylinder. I want to do this
first so I can have the mating features to create the screw, saving
time from having to locate it.
for the screw. I have already modeled it in my IronCAD lesson, so I
will just recreate it here. I again insert a component "screw".
I could actually export it from my IronCAD part file. But this is a
modeling exercise. If you would like to see the two systems working
together go to his link. That would be a very informative productive
modeling techniques article.
3D CAD Systems Working Together
will again use the reference in the assembly menu to create the
will now create the head of the screw, by creating a primitive
cylinder. locating and sizing. Have to admit I am getting good at
this and I am pleasantly surprised. I find ZW3D very, very easy to
use and highly productive.
for the bottom boss. It is so cool that I can just select the edge
of the circle and define it to the center. Again i locate and size
the cylinder. I love this I didn't even have to manipulate the view.
This is huge!
for the slot on top. Yes, yes, yes, we insert a primitive block and
small step to add the screw thread cosmetic image. Hmm as I was
doing this I realized the screw body was the wrong size so I have to
go to the direct edit menu and set the body to 7/32 diameter. I like
have these mistakes show up, to show that we can edit the model in
any stage on the fly without having to edit a sketch.
for the cosmetic thread. This feature shows the the thread as a
feature in the drawing.
done with the parts we are doing today.
is an exploded view.
are the views defined in the 2D sheet generated from the Center
Grinder assembly. We add the dimensions and we
are completely done with the part. Please remember, we have done
this all in one file. Think it through!
is the original. I did add some dims that were not defined.
I did modify the screw. You can imagine
that this designer was avalable to manufacturing to answer any
If you would like
to try ZW3D, please download for a 30 day evaluation.
For more information or to download ZW3D
Give me a call if you have any
questions. I can set up a skype or go to meeting to show this part
or answer any of your questions on the operation of IronCAD. It
truly is the very best conceptual 3D CAD system.
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