Punch! CAD
»
ViaCAD & Shark
»
Solid Modeling
»
Using just ViaCAD, can I tell if this object would tip over? (#3678)
Rank: Junior Member
Joined: 9/28/2008(UTC) Posts: 19
I was setting up my new dual monitor stand the other day and nearly lost both monitors when it started to tip over. I lowered the mount arms and all was well. But that got me to wondering if ViaCAD could have predicted the tipping over.
My math wasn't up to the challenge of calculating the forces involved but I see that ViaCAD can calculate the mass and center of gravity of any solid. Can one of the big brains on the forum tell if there's a quick and dirty way to tell if a shape would fall over, just using what ViaCAD knows?
For simplicity let's assume the shape is all one rigid part made out of wood, sitting on a wooden table. Also assume all the shapes are simple blocks, cylinders and planks.
Bonus points if forces can be shown just with geometry.
Is anybody up to the challenge?
File Attachment(s):
rigid_body.vcp
(173kb) downloaded 4 time(s). willc2 attached the following image(s):
rigid_body_example.png
(38kb) downloaded 4 time(s). You cannot view/download attachments. Try to login or register.
Rank: Senior Member
Joined: 11/4/2007(UTC) Posts: 515
Was thanked: 1 time(s) in 1 post(s)
You can tell if the model you've described is going to fall over, and you don't need any more geometry than knowing that if the CoG is outside the perimeter of the foot - whoopsie. But it's more involved for the real-world instance, because the assembly isn't a single solid part of homogeneous material, so you'd have to represent each member of the assembly with mass and CoG relative to each other before adding them. If you did that, VC would give you the right indication.
zumer attached the following image(s):
whoopsie.PNG
(25kb) downloaded 4 time(s). You cannot view/download attachments. Try to login or register.
Rank: Junior Member
Joined: 9/28/2008(UTC) Posts: 19
So I lightened the monitor slab and extended the foot and sure enough, c.o.g is now within the perimeter of the foot. For more accurate results I guess I could resize the component parts until they have the right relative volumes/masses.
Awesome! ViaCAD is to mechanics what notepad.exe is to programming. :)
Thanks zumer
willc2 attached the following image(s):
tipping-point.png
(37kb) downloaded 4 time(s). You cannot view/download attachments. Try to login or register.
Rank: Senior Member
Joined: 11/25/2009(UTC)
Posts: 833
Thanks: 2 times Was thanked: 29 time(s) in 21 post(s)
Your foot print is still small. In theory your stand is "stable". But if you touch the front, your model will move down easily.
METEORE DESIGN / KEKO Stand Jean-Francois Jacques, Industrial Designer SharkCad Pro V14 B1653 Platform macOS 14 Sonoma
Rank: Senior Member
Joined: 2/26/2007(UTC) Posts: 2,156
Was thanked: 1 time(s) in 1 post(s)
>>Your foot print is still small .. or more weight at the back of the foot !?
Rank: Senior Member
Joined: 2/19/2007(UTC) Posts: 501
Was thanked: 2 time(s) in 1 post(s)
You can also assign different material properties and weights to each part to get a better idea of where the CG might be.
Verify > Properties
NickB attached the following image(s):
screenshot 04.png
(71kb) downloaded 4 time(s). You cannot view/download attachments. Try to login or register.
Shark FX 9 build 1143
OS X 9.5
3.6 GHz Core i7, 8GB, GTX 760 2GB
matter.cc
Punch! CAD
»
ViaCAD & Shark
»
Solid Modeling
»
Using just ViaCAD, can I tell if this object would tip over? (#3678)
Forum Jump
Punch! CAD
ViaCAD & Shark
- News and Announcements
- General
- 2D Drafting
- Surface Modeling
- Solid Modeling
- Subdivision Modeling
- Rendering & Display
- Import/Export
- Tips and Tutorials
- Suggestions
- Gallery
- PowerPack
- Punch Lounge
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.