Center of Gravity, Center of Moments

[Anonymous]

Please add the ability to show the Center of Gravity and Moments of Inertal for an object and components. These basic values are critical for moving parts and designs!

[roambotics_scott]

These are actually computed now in properties.. they're just in a very usable form

Please like: http://forums.autodesk.com/t5/ideastation-request-a-feature-or/last-mile-center-of-mass-moments/idi-...

[O.Tan]

If you want it to be displayed on the model, eg: something like a dot to represent CoM & CoG, you'll have to wait a little longer, I read somewhere that it's coming but right now we have to settle for the text version as roambotics_scott mentioned 

[promm]

As posted in the what's new, this was the first phase for center of gravity. http://www.autodesk.com/products/fusion-360/blog/may-25-2016-update-whats-new/.  We are currently working on showing the center of gravity as an analysis and have the ability to measure to it.

Cheers,

Mike Prom

[promm]

Thank you for your idea, the work to implement the ability to show and measure to the center of gravity will be soon be started.  Once completed the idea will be changed to implemented.

Regards,

Mike Prom

Internal Tracking FUS-25093

[waltertulin]

Please include center of gravity function into Fusion360.

[TMC.Engineering]

I am curious if you maybe mean center of mass?  they are similar.  and if we assume gravity is uniform over the object then they are at the same point.

C of M is given in Fusion- RMB- properties

[roambotics_scott]

I'd add that it's in there.. but only in the sense that it gives you coordinates. Without a script, you don't get a graphical point for the CM (and with a script, you don't get one that dynamically updates with the model) so it's 90% there but still kinda useless @promm

Also / closely related: we get the moments of inertia in properties, but really need zero to three axes of non-degenerate moments (or an axis plus a plane for the case with 1-dimensional non-degenerate and 2-dimensional degenerate moments; or just the CM point without any axes or planes for the 3-dimensionally degenerate case)

The way this should work is that along with the origin, there should be an automatically updated point representation for the CM and appropriate combination of 3 axes, 1 axis + 1 plane, or nothing, for the cases of 3 non-degenerate moments, 2 degenerate moments, or 3 degenerate moments, respectively. Those should always be there for every body and component without requiring the user to explicitly do anything, and they should automatically update with any changes and be timeline aware. When degeneracy changes, the user should be notified and appropriate constraints broken or modified as necessary

[Anonymous]

I'd like this for assemblies as well.

[kb9ydn]

An actual CoM point that can be referenced for modelling would be VERY cool!

C|

[CarlFrischmuth]

hi guys,

whats the status on this?

#Mike Aubry (w/ true credit going to Sebastian Morales and Brian Ekins)
#Description - This Fusion 360 Script allows you to create a construction point where the center of mass is for 
# the top level component. This is especially useful for balancing applications.

import adsk.core, adsk.fusion, adsk.cam, traceback
app = adsk.core.Application.get()
if app:
    ui = app.userInterface

def run(context):
    ui = None
    try:
        app = adsk.core.Application.get()
        ui = app.userInterface
        
        # Get all components in the active design.
        product = app.activeProduct
        design = adsk.fusion.Design.cast(product)
        title = 'Create Center of Mass Point'
        
        
        if not design:
            ui.messageBox('No active Fusion design', title)
            return
        
        # Get the root component of the active design
        rootComp = design.rootComponent
        
        # Get physical properties from component (high accuracy)
        physicalProperties = rootComp.getPhysicalProperties(adsk.fusion.CalculationAccuracy.HighCalculationAccuracy)
        
        # Get center of mass from physical properties
        cog = physicalProperties.centerOfMass
        
        # Check to see if a base feature named "Center of Gravities" exists.
        baseFeature = rootComp.features.itemByName('Center of Gravities')
        if not baseFeature:
            # Create a new base feature.
            baseFeature = rootComp.features.baseFeatures.add()
            baseFeature.name = 'Center of Gravities'

            # Begin editing the base feature.
            baseFeature.startEdit()                
            
            # Create a construction point at the COG position.
            constructionPoints = rootComp.constructionPoints
            pointInput = constructionPoints.createInput()
            pointInput.setByPoint(cog)
            pointInput.targetBaseOrFormFeature = baseFeature
            constPoint = constructionPoints.add(pointInput)
            constPoint.name = 'Center of Gravity'
            
            # End the base feature edit.
            baseFeature.finishEdit()
        else:
            # Check that the "Center of Gravity construction point exists.
            cogPoint = rootComp.constructionPoints.itemByName('Center of Gravity')
            
            # Because of a problem with updating an existing point, this current deletes
            # the existing point so the code in the "else" is never executed.
            if cogPoint:
                cogPoint.deleteMe()
                cogPoint = None
            
            if not cogPoint:
                # Create the construction point.
                # Begin editing the base feature.
                baseFeature.startEdit()                
                
                # Create a construction point at the COG position.
                constructionPoints = rootComp.constructionPoints
                pointInput = constructionPoints.createInput()
                pointInput.setByPoint(cog)
                pointInput.targetBaseOrFormFeature = baseFeature
                constPoint = constructionPoints.add(pointInput)
                constPoint.name = 'Center of Gravity'
                
                # End the base feature edit.
                baseFeature.finishEdit()
            else:
                # Edit the existing construction point.
                pointDef = adsk.fusion.ConstructionPointPointDefinition.cast(cogPoint.definition)
                baseFeature.startEdit()                
                pointDef.pointEntity = cog
                baseFeature.finishEdit()
    except:
        if ui:
ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

need to balance my model like ...yesterday!

I found this code but it doesn't seem to do anything in the current nov 9 version of fusion... can anyone tell me why?

[ekinsb]

I just copied and pasted the program above and with one small change it ran as expected.  The last line needs to be indented.  The last three lines should look like this:

    except:
        if ui:
            ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

[CarlFrischmuth]

Awesome, thanks Brian!  🙂

[keqingsong]

This is now available in Fusion 360! http://www.autodesk.com/products/fusion-360/blog/january-19-2017-update-whats-new/