[Plugin] Shape Bender Beta

mac1 · 1 Oct 2010, 21:00

Thank you Chris and Gullfo,

yet, starting point is the standard size of the plywood
and not having to make cuts before hand.

Making use of standard sized plywood,
bend it onto a desired shape,
with an overlap, to be able to determine the boltpositions
and finally know the cutpatterns for top & bottom

I really don't know how this can be modeled in a way it is easy to experiment.
in Sketchup or any 3d software.

yet I guess this workflow might be a bit too much to ask from your plugin,
anyway, I really appreciate your work,

thanks again,

Jasper

Reality vs Virtual Reality?
Having dealt with some issues with graphic epoxy structures some questions come to mind:

What is the max thickness can you bend;
What plans are in work to establish knock down factors for bolt holes and when / how will structural allowables be establish and how. (Building and say it does not fall down is not acceptable);
Plywood by spec has voids so what plans are in place to insure stress risers can be mitigated. Ultra sound is used some times and since the strength is so much processed controlled vs metal what would be done to insure each panel meets some type of spec. I would guess some plywood that is made from radial sheared layers would be very different. Some same questions about the adhesive interface stress, heat and cold flow.
How does one handle the changes in allowables with moisture content;
You have a big hill to climb to get this concept accepted for general use. And then comes the question of analysis capability especially for stress. Have not done any search for plywood to see if any has well established allowables but with its use would hope so.
10/1 23:57 update Note: Did a quick search for plywood allowable stress. One of the returns was a APA plywood spec. One item would have immediate application to your effort. That is the min bend radius for various thickness and they have differnt for the cross grain ( 4 ft) and with grain ( 8 ft) evn for small thickness like 5/32 the numbers are big. ~ 3ft for cross and 8 ft with

bowlr · 3 Oct 2010, 05:56

I have dl the Shape Bender, but have an error
"Error Loading File clf_shape_bender_loader.rb
No such file to load -- progressbar.rb"

when I open SU.

Chris Fullmer · 3 Oct 2010, 06:01

Hi Barry, shape bender also requires a script called "progressbar" to work. You can download it from here:

(www.smustard.com)

Install that and hopefully that will do the trick!

Chris

charly2008 · 10 Oct 2010, 20:31

Hello Chris,

thank you for your wonderful plugin. It works fine except for the edge in the picture. With the previous version, there was no problem with such edges.

Charly

SahmElshamal · 24 Oct 2010, 09:43

can you help me please < it doesnt work with me < it always says ( Error Loading File clf_shape_bender_loader.rb
No such file to load -- progressbar.rb)
whyyyyyyyyyyyyyyyy

Gaieus · 24 Oct 2010, 10:04

Hi Salma,

Please, go back to page 1 in this topic and there is Progressbar.rb linked somewhere at the top. You also need to download/install that plugin so that this can work.

SahmElshamal · 24 Oct 2010, 15:27

Hi Gaieus
thanx 4 ur reply

i will try what u said

SahmElshamal · 24 Oct 2010, 15:35

No such file to load -- clf_shape_bender/clf_shape_bender.rbError Loading File clf_shape_bender_loader.rb
No such file to load -- clf_shape_bender/clf_shape_bender.rb

that message came after i downloaded the Progressbar.rb[
i have already downloaded the plugin and the Progressbar.rb , i work with SU 6

plz tell me the steps of installing a plugin
i cant find set up icon
so i copy - past it to the plugins of SU
is it right ???

thanx

SahmElshamal · 24 Oct 2010, 15:40

it finally worked
!!!!!!
thank u ,moderator
thank u chris
great plugin

charly2008 · 28 Oct 2010, 15:47

Hi,

what I still don't understand is how do I control the length of the curved object?

Charly

Dave R · 28 Oct 2010, 16:07

You have to make the arc the desired length. In your example, the arc needs to be 2.80 metres long. You can get the length from the Entity Info box after you've drawn it but that doesn't make it easy. How you arrive at that arc length will be the challenge. I wonder if someone could write a plugin that would take a given radius and arc length and draw the arc.

Generally I draw the arc first, measure its length and draw the straight line and the straight shape to match.

charly2008 · 28 Oct 2010, 16:26

Hi Dave,

thanks for your reply. I've done it with your method, but can still get a different length in the curved object.

Charly

Dave R · 28 Oct 2010, 16:31

Ah. Yes. Put the original shape directly above the straight line. The plugin draws the bent shape with the same offset from the arc as you have between the original shape and the straight line.

charly2008 · 28 Oct 2010, 17:18

thanks Dave,

If you place the line exactly at the origin z-axis below the shape you will not have an offset.

Charly

Chris Fullmer · 28 Oct 2010, 17:38

Its a game of percentages. Think of the arc as being 100%. Then your straight line, however long or short it is is also 100%. And it comes down to how the component matches up to the straight line. If the straight line is drawn precisely from end to end along the component (on the red axis of course), then you could say the component sits along 100% of the straight line. Therefore when it bends, it will become 100% the lengt of the arc.

arc = 1m
line = 1m
component sits on 100% of line (therefore is 1m long)
final shape will remain 1m

arc = 1m
line = 200m
component sits on 100% of line (200m long)
final bent shape will squish down to 1m

arc = 1m
line = .5m (50% of arc length)
component sits on 100% of line (0.5m long)
final bent shape will be 1m long

Dave R · 28 Oct 2010, 18:19

@charly2008 said:

thanks Dave,

If you place the line exactly at the origin z-axis below the shape you will not have an offset.

Charly

Exactly.

LeoZ · 28 Oct 2010, 20:35

Hai Chris
First I must say I am impressed with your work on Sketchup. I was very enthusiastic about your Shapebender. But I stumbled on some problems with it. I tried to make a “real” metric bold; a M10. That’s a 10mm bold with a thread of 1.5 mm /turn. I wanted to use the method of “fret2424” (http://www.youtube.com/watch?v=MKrWDNDd62c )
So I started with half a circle with a radius of 5 mm and I lifted one end 0.75 mm. That is not exactly right, but it was just to try.
I got some very strange results you might like to investigate.
Perhaps I am doing something wrong, but then I would like to know what.
Thanks

Chris Fullmer · 29 Oct 2010, 04:27

My guess is that the faces are too small. You might try scaling everything up by 10 or 100, then scale it down afterwards. Can you upload the model here?

charly2008 · 29 Oct 2010, 12:47

Hi,

this is a wonderful tool. Here is a test with a wood carving model.

Charly

Chris Fullmer · 29 Oct 2010, 15:41

That is precisely the kind of stuff I wrote this for - intricate models that need to be bent to match an actual surface. Bending detailed woodwork to match a curved piece of wood, adding signange/letters to a curving wall, etc. It is definitely a quirky plugin, but once you really get it down solid in your head the process it goes through and how to get what you want, it works pretty well. Thanks for lookig at it,

Chris