Fun with Solid Modeling

[Fourthshifter]

The very basic ways of creating a 3D body on a CAD software are protrusion and rotation.

Let's talk about the basic of protrusion.

Normally, before we create a solid body, we have to do sketch on a 2D surface before we sweep or protrude or rotate it to give it a 3D body.

the 2D surface that we sketch will be the CROSS SECTION and the 3D body that we protrude from the sketch is called PROFILE.
The shape of profile is... well... a prism (x- section surface multiply by the length or height of profile).

PROFILE is very useful in industry.we can make a long profile and we can cut along the length of profile in a fix distances using milling machine to manufacture many more shorter profiles. It is like a long tube that can be cut into many short tubes (Tube is a kind of profile btw).

Here is a demo of making a profile using CAD.

First a cross section is sketched. after that it is protruded. You get a profile. Simple as that.


http://img250.imageshack.us/img250/3102/30071485mj7.gif

[white2020]

extrude and extrude cut

[white2020]

are there any competitions regarding the solid modelling?

if yes, please tell me or privide links here, thanks

[Fourthshifter]

Here's a very good demo on dolis modeling. clean and sleek !

http://youtube.com/watch?v=E9Vc7wgE-jI

[white2020]

http://www.solidworks.com/pages/successes/CustomerDesignContest/CustomerDesignContestRules.html

[white2020]

Here's a very good demo on dolis modeling. clean and sleek !

http://youtube.com/watch?v=E9Vc7wgE-jI

cool site i would say

[chiachean]

Here's a very good demo on dolis modeling. clean and sleek !

http://youtube.com/watch?v=E9Vc7wgE-jI

cool site i would say


I have watched it

It is really cool.

I agree with you.

[white2020]

Here's a very good demo on dolis modeling. clean and sleek !

http://youtube.com/watch?v=E9Vc7wgE-jI

cool site i would say


I have watched it

It is really cool.

I agree with you.

Thanks

[Fourthshifter]

yeah.

we have finish talking about protrusion.

Rotation, Sweep, Blend and Sweep-blend will come soon.

[white2020]

Rotation Can let u to see all the faces hidden behind the grafic

Sweep includes sweep-cut and sweep revolve

Sweep-cut, u make a peth-line to become its path and creat an suface u want to cut through that path

while for Sweep revolve, it is the same but u r not cutting but adding

[white2020]

while..can anyone please explain blend and sweep-blend?

[Fourthshifter]

Rotation Can let u to see all the faces hidden behind the grafic

Sweep includes sweep-cut and sweep revolve

Sweep-cut, u make a peth-line to become its path and creat an suface u want to cut through that path

while for Sweep revolve, it is the same but u r not cutting but adding


LOL, where u read all these? *laughs*

it would save you embarassment if you say what you really sure about.

[white2020]

Rotation Can let u to see all the faces hidden behind the grafic

Sweep includes sweep-cut and sweep revolve

Sweep-cut, u make a peth-line to become its path and creat an suface u want to cut through that path

while for Sweep revolve, it is the same but u r not cutting but adding


LOL, where u read all these? *laughs*

it would save you embarassment if you say what you really sure about.

no..u should not laugh so early..mine is Solidwroks..urs perhaps is PRO/E...mayb the ways it works are different..

that are what i have done in Solidworks.


Perhaps urs are easier, while need more steps

Perhaps..u should briefly explain urs?

[Fourthshifter]

OK my bad. i tried to explain solid modeling universally without refering to any specific CAD softwares so that everyone can design on as many platforms as possible.

[white2020]

OK my bad. i tried to explain solid modeling universally without refering to any specific CAD softwares so that everyone can design on as many platforms as possible.

OK...so, we should explain together...m i right?

Or let others to search themselves in the web??

Can u explain that solid modeling that u want to explain earlier?
(sweep, Rotation, Blend, sweep-blend)

In a more general way?..as u r more experience in these softwares

[Fourthshifter]

OK after talking about protrusion, the next common way of generating a solid body is through Rotation.

As we learned in integration (maths) we rotate a surface along a rotational axis to generate a cylindrical solid body.
Same as in solid modeling, we generate a body by rotating a sketched surface about a rotational axis.

In 2D sketching, we only need to sketch on one side beside the rotational axis. After that the surface is rotate and we get a body. If the 2D sketch is a rectangular touching the axis, we generate a cylinder. We can make the body hollow, by having the sketch drawn further away from the axis, like a long thin rectangular with an offset from the axis will give you a 3D tube when rotated.

Therefore, you can generate solid or hollow bodies (cup, vases etc) with this method. One thing good about this method is that it can make bodies with various diameters along its axis just by sketching