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HELP Modelling base with curvature. Extrude to shape?

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HELP Modelling base with curvature. Extrude to shape?

  1. I am wondering if anyone can advise how to create a shape similar to this. It seems to be an extrusion up to another shape but I am not sure how

2. Also I accidently seemed to mess something up in the model tab as I now can not delete them from there.

1 ACCEPTED SOLUTION

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Re: HELP Modelling base with curvature. Extrude to shape?

I have to reitterate this comment. I mis-understood the R313 and R17 callouts. This is a fairly straight forward extrude but it is missing the draft requirement.

I created a R170 hemisphere and extruded the triangular shape with the remove "remove material" and flipped the removed material to the outside.

I don't know what the triangular shape is from the limited details provided.

SphericalBase.PNG

View solution in original post

50 REPLIES 50
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Re: HELP Modelling base with curvature. Extrude to shape?

The part was created with a spherical feature as a primary feature and the rest was added and removed.

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Re: HELP Modelling base with curvature. Extrude to shape?

Thanks for replying.

Sorry but I dont exactly understand what you mean.

I started by making a triangle shape then added the rounds at each vertex. I thought from the R313 that I would need to place a large circle so that I could create a remove material extrusion. However it isnt that straightforward as this the height of the vetices are lower than the middle. My thought was I would have to make a r313 extrusion upwards from the bottom to the shape of another circle/arc.

Thanks for your help.
Screen+Shot+2013-09-30+at+6.23.30+PM.png

Screen+Shot+2013-09-30+at+6.23.17+PM.png

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Re: HELP Modelling base with curvature. Extrude to shape?

Or another way, draw the triangle shape first, and then revolve cut the sphere shape into the top.

OR draw the triangle shape first and then revolve a surface for the sphere and replace the top surface with the sphere surface. but that's kind of a few extra steps.

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Re: HELP Modelling base with curvature. Extrude to shape?

I have to reitterate this comment. I mis-understood the R313 and R17 callouts. This is a fairly straight forward extrude but it is missing the draft requirement.

I created a R170 hemisphere and extruded the triangular shape with the remove "remove material" and flipped the removed material to the outside.

I don't know what the triangular shape is from the limited details provided.

SphericalBase.PNG

View solution in original post

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Re: HELP Modelling base with curvature. Extrude to shape?

Wow that looks about right. Thanks for all your help so far Antonius!

So you created the hemisphere, drew a triangle shape-extruded and removed the unnecessary material?

also how do I do the hemisphere? I am pretty new to Creo and running it on mac so its a lot of messing about.

Cheers

P.S. I've attached a more detailed image incase that helps at all.

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Re: HELP Modelling base with curvature. Extrude to shape?

The 1st feature is a solid revolve of a R170 hemisphere (180 degree rotation)

The second feature is the "triangle" shape and is in fact a cut that removed everything -outside- the closed section.

The third feature is a simply round along that top edge.

A subsequent cut can trim the base's height.

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Re: HELP Modelling base with curvature. Extrude to shape?

Oh, that image makes it a lot easier

http://communities.ptc.com/servlet/JiveServlet/download/222110-57080/Screen%20Shot%202013-09-28%20at%202.45.37%20PM.png

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Re: HELP Modelling base with curvature. Extrude to shape?

Different ways....

tri.JPG

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Re: HELP Modelling base with curvature. Extrude to shape?

Ah okay, yeah I remember the revolve now.

I've tried with the triangle. Did you sketch it on the curved edge or the bottom and go up?

Ahhh I think I got it if you did go from top. You extruded from top until 139mm above the hemisphere centre?

And re the triangle dimensions I was thinking an equilateral with about 165-170mm from looking at the other dimensions and a bit of research into the component.

I am still tinkering with it as it still looks a bit off.


You've been amazing help!

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Re: HELP Modelling base with curvature. Extrude to shape?

The extrude is from a plane up 31mm (170-139).

I am setting creo up on new computer, Antonius do you know which config file holds the UI stuff? Like which icons are in the quick bar and stuff? It used ot be config.win back in the day now I'm not sure what it is...

tri2.JPG

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Re: HELP Modelling base with curvature. Extrude to shape?

Matt, from the help files: But I can't find it.

About Saving User Interface Custom Settings

Creo Parametric automatically saves all user interface custom settings to the creo_parametric_customization.ui file that is located in the <user profile>\Application Data\PTC\ProENGINEER\Wildfire\.wf\.Settings\. The customizations of the ribbon, Quick Access toolbar, and Graphics toolbar that you make without opening the Creo Parametric Options dialog box are also automatically saved.

If the value of the load_ui_customization_run_dir configuration option is set to yes, then Creo Parametric saves the creo_parametric_customization.ui file to the run directory.

You can save creo_parametric_customization.ui as creo_parametric_admin_customization.ui and place it at creo loadpoint/text to store the CAD administrator settings. The creo_parametric_customization.ui file overrides the creo_parametric_admin_customization.ui file.

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Re: HELP Modelling base with curvature. Extrude to shape?

AH, ok thank you. I will figure that out in the morning.

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Re: HELP Modelling base with curvature. Extrude to shape?

I sent you the path in your private message box.

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Re: HELP Modelling base with curvature. Extrude to shape?

GOT IT!!! Thank you very much Matt and Antonius! Would have been way off without your brilliant help!

See you guys around and thanks again.

Cheers

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Re: HELP Modelling base with curvature. Extrude to shape?

I did this way for the heck of it, too. But not my first choice.

revolve a surface of the arc around (170 rad. by 31mm plane to tangency).

Then extrude up a section form the first way I did, but only 5mm, pattern that around axis 3x 120 degrees.

Then select the top surface of the extrude the click Offset, change it to Replace and pick the original revolved surface.

Then add the 313 rads.

Again, not MY first choice but some people probably like this method.

tri3.JPG

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Re: HELP Modelling base with curvature. Extrude to shape?

That works too. A lot of ways to skin this cat. But it is only the beginning for the challenge Ioic is facing.

Looks like a fun challenge.

Matt, you have a P.M.

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Re: HELP Modelling base with curvature. Extrude to shape?

fooling around, not 100%. you can have this model if you want it, but I make no guarantees for the accuracy, some missing numbers on your picture.

tri4.JPG

tri5.JPG

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Re: HELP Modelling base with curvature. Extrude to shape?

Here's another way:

TRIANGULAR_THING.png

Quite fun, isn't it?

John

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Re: HELP Modelling base with curvature. Extrude to shape?

We really need a life, huh Nice work guys!

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Re: HELP Modelling base with curvature. Extrude to shape?

You guys are amazing to do it so fast! It is a good challenge but unfortunately that is just the base of the entire assembly hahaha. Though I think this is the hardest part so hopefully after this it should be fine. I'll make sure to get in contact with you guys if I am stuck though!

We are supposed to use our own judgment so as long as it looks right and I use the dimension I can, like you guys have done, I should be able to get it there.

John, what did you do for the reference and sketching for the triangle to get it so it is facing the right way in standard orientation? I am still messing up with my referencing which isn't a big deal with doing the assembly but may be a problem for doing the detail drawings etc.

Also for the lip I am guessing that you just extruded then chamfer from the base of the triangle?

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Re: HELP Modelling base with curvature. Extrude to shape?

You don't have to worry about orientation too much. You can define your views on the fly in the model and somewhat in the drawing. There is a dynamic orientation in the orientation dialog. It can be manipulated in relation to the screen axis or the model axis. Remember to save your views.

On the bottom lip, I might consider a sweep feature.

The drawing you provided is actually quite detailed. I only see a few things missing such as the detail at the bottom of the slot feature on the inside.

But I'll challenge both modelers to now add 2 degrees of draft to the part

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Re: HELP Modelling base with curvature. Extrude to shape?

yeah sweep the bottom lip. Mine already has 1 degree of draft on the trangle shape so hehe. I've modeled so many parts from prints, I actually really enjoy it.

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Re: HELP Modelling base with curvature. Extrude to shape?

alright got the sweep

What do you suggest about the bottom face material removal?

hahah well you'd love this project Matt-after this there is another 10+ parts. Slowly getting the hang of it. Makes it harder doing it on a mac.

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Re: HELP Modelling base with curvature. Extrude to shape?

Shell feature... but you want to do this early on or it will fail on the 3mm wall.

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Re: HELP Modelling base with curvature. Extrude to shape?

Loic,

The sketch setup for the triangle was as shown:

triangle+sketch+setup.png

The bottom lip is a Variable Section Sweep using the outline of the base as the trajectory.

The bottom surface was removed using a shell feature straight after applying the spherical cut to the top surface.

As Antonius says, there are tons of ways to model this. All have their own benefits and disadvantages.

I found the trickiest bit was the webs either side of the 'ramp' cut between the tabs. That took a bit of thought, and it's still not properly right.

Have fun trying all the different ways and see which you like best, and don't be afraid to tear it all apart and start again if you decide a different approach would have been more appropriate.

2 degrees of draft...

Well, that's another question!

Cheers,

John

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Re: HELP Modelling base with curvature. Extrude to shape?

John Wayman wrote:

...
2 degrees of draft...

Well, that's another question!

...

It was a trick question, of course When you add draft to the equation, 3D becomes 12D very quickly.

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Re: HELP Modelling base with curvature. Extrude to shape?

Thanks Jon and everyone else. It's tricky but I am working my way through it. Hopefully I won't have any more problems with the base.

However, I was wondering if I could ask the Creo Think Tank what they thought of this section. I have tried to swept and blend but so far it doesnt work. My idea was to create the kind of winged rectangle on the base and then the square at the bottom and swept blend. But it doesnt seem to be working. Any thoughts?

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Re: HELP Modelling base with curvature. Extrude to shape?

The part above the round shaft? Probably because of the way it is dimensioned, just extrude from center 16 at the bottom and 36 at the top. 22 from center. then turn it and cut away from nothing at the top to the 16 width at the bottom (cut will be 2 triangles, or one triangle and a mirror). I can m

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Re: HELP Modelling base with curvature. Extrude to shape?

Yeah, its the trapezoid kind of form.

  1. So extrude the square (16) from below (34mm below holes) to the bottom surface?
  2. Then the angled rectangle on the bottom surface to the side surface of the square extrude?

I think mine is a bit off because the angles dont look quite right.

  1. Screen+Shot+2013-10-04+at+5.10.41+PM.png
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