Problems doing a curve

Gumleguf · 21 Jan 2011, 14:31

Hello,

Have carefully started drawing a clone of the Jamo R909 Oben Baffle speaker. It can be seen here and here .

Yes, I am considering building the clone eventually in real life, but want to visualize it first in Sketchup.

I don't understand how to make the curved baffle?
I also don't understand why some surfaces are not "filled out", like the sides and top. That makes me think that Sketchup and I don't agree on the fact that the baffle is one piece.

Here is what I have so far (only just begun but already have problems).

JamoR909_clone.skp

ely862me · 21 Jan 2011, 14:48

just take it step by step,as you would do with a piece of wood

JamoR909_clone rev.skp

TIG · 21 Jan 2011, 14:53

Here's some ideas Note that to make double-curvature surfaces like the top etc there are tools like CurviLoft and EEbyRails... BUT you can simply use a Style that shows End-Points and have Hidden-Geometry temporarily set to be 'on' and then you just hand-stitch pairs of vertices across the required surface as triangles that will auto-face... I suggest you make it out of grouped pieces or components since that separates geometry and makes life easier...

Jean Lemire · 21 Jan 2011, 15:20

Hi Gumleguf, hi folks.

See this SU file for ideas.

JamoR909_clone 2.skp

Gumleguf · 21 Jan 2011, 16:22

Elisei and Jean Lemire > Thanks for the pointers. Good suggestions. It's sometimes difficult to get "a good start" when not so experienced in Sketchup/3D modelling.

Tig > I'll try to work my way through your suggestion, however it looks like I may be in over my head here...

TIG · 21 Jan 2011, 16:53

This is another way of making a punched hole in a curve surface

Gumleguf · 22 Jan 2011, 13:14

Tig > I have problems understanding your instruction from 21 Jan 2011 16:53, where it says "Draw curve and extrude vertically". I don't understand how to do that?

Edit: Ended up drawing it by hand, but don't know if there is an easier way? Here is the model now with hidden geometry 'On':

TIG · 22 Jan 2011, 13:41

@gumleguf said:

Tig > I have problems understanding your instruction from 21 Jan 2011 16:53, where it says "Draw curve and extrude vertically". I don't understand how to do that?

Edit: Ended up drawing it by hand, but don't know if there is an easier way? Here is the model now with hidden geometry 'On':

[attachment=1:1yx0p6rf]gbl3232.JPG[/attachment:1yx0p6rf]

If you want to extrude a curved face vertically add a temporary 'back-line' so it makes a face, then PushPull that face up as desired. erase the two edges corresponding to the temporary back-line and its extruded counterpart. You have an extruded curve as a surface...[attachment=0:1yx0p6rf]Capture.PNG[/attachment:1yx0p6rf]

Gumleguf · 22 Jan 2011, 14:00

Arh, it's that simple. Nice.

This is where I am now - clearly I am doing something wrong.

B.t.w. it's on purpose that a "bass cylinder" shoots out from the back.

JamoR909_clone_3.skp

Gaieus · 22 Jan 2011, 14:06

You must have moved the cylinders when you adjusted it and it distorted the shape. Those extra edges are indicators of this (from the autofold). I do not know how you ended up with the missing faces but maybe also because of this.

Have you got a version beforethe intersection?

Gaieus · 22 Jan 2011, 14:33

Of course it won't connect as that shield shape is not only a curved surface but its edges are all curved, too. TIG's example is good only when all the edges are straight. (Or else I misunderstood something)

Is this that you want to end up with?

JamoR909_clone_4.skp

Gumleguf · 22 Jan 2011, 14:35

Okay.

Tried again following Tig's instructions more carefully. This is where I am now. Do i simply make a copy of the curved group and then connect the two via lines, or...? Tried that but it doesn't seem to "connect" the two curves.

JamoR909_clone_4.skp

Edit: Didn't quite understand this at first bt since my curved surface isn't the same width at top and bottom, the top and bottom isn't the same "depth" either. Hmmm... Sure glad I wanted to do this in Sketchup before I started building anything!

Gumleguf · 22 Jan 2011, 14:39

Gaieus > Almost. I can get approximately that far too now. However, I would like to end up with something like this .

Thing is though that it's narrower at the bottom (420mm) than at the top (520mm). This also makes the model "deeper" at the top. I had not noticed that 'til now.

Gumleguf · 22 Jan 2011, 14:47

To illustrate my point.

Two groups are facing each other. I "just" need to connect them, but can't work out how to.

JamoR909_clone_5_two_facing_groups.skp

Gaieus · 22 Jan 2011, 15:23

The whole thing is just 30 mm thick. Should the max top thickness be 520 mm?

TIG · 22 Jan 2011, 18:07

I quickly made this from the one face.
Switched of Hidden Geometry.
Removed the 'holes-surfaces'.
Selected all Surface/Edges
Use EEbyVector to extrude it backwards by ~50mm.
The 'sides' are made, but the 'back' is missing at this point.
Copied [Move+Ctrl] the front Surface and placed it on the back.
Selected that Surface and Reversed it so all faces are then 'out'.
Selected all and Smoothed...

Gumleguf · 22 Jan 2011, 18:10

Gaieus > Not sure I understand?

Bottom width is 420mm, top width is 520mm. Space between the two (depth) is 50mm.

Gumleguf · 22 Jan 2011, 18:14

TIG > That's 99% procent done. Sweet! I'll try to follow your instructions, and see how far I get.

You guys rock!

Gumleguf · 22 Jan 2011, 19:21

Tig > Tried following your instructions and ended up with this. It looks correct except that when I use EEbyVector to extrude it backwards by 50mm my model gets "sliced up". I finished and also pasted the back to it and reversed it, but when smoothing the model the "slices" remains:

JamoR909_clone_6_EEbyVector_1.skp

Gaieus · 22 Jan 2011, 20:17

Ah, OK, I thought you meant the thickness of that plate...