V0.19: Top Down Design of a Folding Step Ladder
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V0.19: Top Down Design of a Folding Step Ladder
This is a project I used to further explore in-context modelling and top down design using a master sketch, carbon copies, fasteners workbench, and Assembly4 for the parametric rivets. The approach is a bit of a hybrid assembly which I would not recommend except for learning purposes. In this example, Assembly4 was conveniently used only for the rivets although all parts including ISO-standard fasteners could be included in the Model_Assembly with a bit more effort.
In this project, the model was created from dimensions scaled from photos of a commercial step ladder as shown in the following screen shot. All parts are in the same file, each of which were created from modified carbon copies of the top level master sketch. In this manner it is possible to articulate the moving parts of the model by changing one constraint defined in the master sketch. All of the moving parts follow the action of the master sketch.
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I can place the 4.8 MB file on Dropbox for anyone interested. Please contact me via Private Message.
Zolko has recently added several improvements to the Assembly4 workbench that facilitate top down design including fasteners which I used in another project https://forum.freecadweb.org/viewtopic. ... 30#p349238 that was built from detail drawings. This workbench is evolving nicely, at least for my purposes. Kudos to the developer
OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.18719 (Git)
Build type: Release
Branch: master
Hash: c021ff70debb106b27d03ed1707f4b05fcf385a6
Python version: 3.6.7
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/United States (en_US)
In this project, the model was created from dimensions scaled from photos of a commercial step ladder as shown in the following screen shot. All parts are in the same file, each of which were created from modified carbon copies of the top level master sketch. In this manner it is possible to articulate the moving parts of the model by changing one constraint defined in the master sketch. All of the moving parts follow the action of the master sketch.
.
I can place the 4.8 MB file on Dropbox for anyone interested. Please contact me via Private Message.
Zolko has recently added several improvements to the Assembly4 workbench that facilitate top down design including fasteners which I used in another project https://forum.freecadweb.org/viewtopic. ... 30#p349238 that was built from detail drawings. This workbench is evolving nicely, at least for my purposes. Kudos to the developer
OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.18719 (Git)
Build type: Release
Branch: master
Hash: c021ff70debb106b27d03ed1707f4b05fcf385a6
Python version: 3.6.7
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/United States (en_US)
"It is a poor workman who blames his tools..."
Re: V0.19: Top Down Design of a Folding Step Ladder
Impressive !
Personally, not designing anything about mechanical parts but interested very much in the way 'master sketch' is used.
Can have a simplified model for my slow 6G ram i3 machine ?
Personally, not designing anything about mechanical parts but interested very much in the way 'master sketch' is used.
Can have a simplified model for my slow 6G ram i3 machine ?
Re: V0.19: Top Down Design of a Folding Step Ladder
Excellent work. I have read some your posts prior and the dup of a carbon copy is good stuff, that is next on my list of things to learn and get comfortable with.
Re: V0.19: Top Down Design of a Folding Step Ladder
Nicely done!
P.S. And i see you have started to introduce some assembly related FreeCAD capabilities in your workflow. That indicates, we are on the right track, when it comes to the ongoing development in this area.
P.S. And i see you have started to introduce some assembly related FreeCAD capabilities in your workflow. That indicates, we are on the right track, when it comes to the ongoing development in this area.
- arturromarr
- Posts: 326
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- Location: Poland
Re: V0.19: Top Down Design of a Folding Step Ladder
Well done work, congratulations on an interesting project.
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- DeepSOIC
- Veteran
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Re: V0.19: Top Down Design of a Folding Step Ladder
Impressive!
Hmm, that's slow as a dead cow. I wonder why... gotta check out Zolko's creation when I have time, to see why is it taking so long. I expected it to be pretty instantaneous.
Re: V0.19: Top Down Design of a Folding Step Ladder
I suspect it may have something to do with using the master sketch solver to articulate the mechanism and multiple duplicated Sketch carbon copies rather than Assembly4 itself.
I am now creating a similar Assembly4 using only a master sketch and shapebinders of the sketch rather than the carbon copies to see if
that makes any difference.
"It is a poor workman who blames his tools..."
Re: V0.19: Top Down Design of a Folding Step Ladder
Please see similar file at https://www.dropbox.com/s/qlud995qng29f ... FCStd?dl=0 which is
discussed in https://forum.freecadweb.org/viewtopic. ... 30#p349238
"It is a poor workman who blames his tools..."
Re: V0.19: Top Down Design of a Folding Step Ladder
Thank you for your comment.
Yes, indeed. I would like to be assured that the assembly developers take into account the need for a top-down design approach and requirement for in-context modeling.
"It is a poor workman who blames his tools..."
Re: V0.19: Top Down Design of a Folding Step Ladder
Thanks!ppemawm wrote: ↑Wed Nov 27, 2019 3:46 pm Please see similar file at https://www.dropbox.com/s/qlud995qng29f ... FCStd?dl=0 which is
discussed in https://forum.freecadweb.org/viewtopic. ... 30#p349238