proprieta' di mass

[Alerm]

hello to all
I would have a problem with a failure to match the data reported by mass property and actual data of a box
in practice I am drawing with sw the box that I would need and I must maintain cmq an internal volume of 60 liters whatever the shape
I started from the odds that I was reported and that according to the manufacturer the box has a volume of 60 lt, but I do not understand why with mass property gives me a volume of 17.5 lt
I attach photos to better clarify the problem and if I have done correctly the right steps
I first created a simple extrusion with the required dimensions, then I applied emptiness with thickness of 20mm, thickness required by the manufacturer, and then mass property and selected empty but the resulting value is 175..... mm^3
Where am I wrong?

 

[eboss]

but you're checking the volume of the solid that came out like this.
Maybe you should try with the matching command and subtract the hypothetical "body" that would correspond to the volume of the liquid.
if you want to do a test on the guide is explained how to do... nothing changes from the 2011 version.
http://help.solidworks.com/2012/italian/solidworks/sldworks/hidd_dve_feat_combine_bodies.htmthen in the end you will find yourself with a body subtracted to the main solid that corresponds to your liquid and in that case the volume must correspond given your supplier gives you the size and thickness of the box to contain 17.5 lt. :finger:

 

[meccanicamg]

As you've done, you've found the volume of the sheet, I think it's so...

 

[eboss]

but did you try to do as indicated in the guide?
post the file and size so you can verify!

 

[pritio72]

hello, I tried to make solid and calculate mass properties and turn out 63 liters.
Steps: 1) created solid as attached photo 2) empty mm20 thickness 3) created a solid full with internal shape and extruded for 400 (420-20) and I did not join the result to create a multibody part 4) deleted the first body and calculated mass. result 63.138 liters. attached the file.:biggrin:
View attachment Prova.zip

 

[sampom]

hello to all
I would have a problem with a failure to match the data reported by mass property and actual data of a box
in practice I am drawing with sw the box that I would need and I must maintain cmq an internal volume of 60 liters whatever the shape
I started from the odds that I was reported and that according to the manufacturer the box has a volume of 60 lt, but I do not understand why with mass property gives me a volume of 17.5 lt
I attach photos to better clarify the problem and if I have done correctly the right steps
I first created a simple extrusion with the required dimensions, then I applied emptiness with thickness of 20mm, thickness required by the manufacturer, and then mass property and selected empty but the resulting value is 175..... mm^3
Where am I wrong?

per "mass property"the program obviously means the mass of the solid body you shaped, and not the "empty" in it contained. you are calculating the mass (or volume in this case) of the walls of your box.

 

[eboss]

hello to all
I would have a problem with a failure to match the data reported by mass property and actual data of a box
in practice I am drawing with sw the box that I would need and I must maintain cmq an internal volume of 60 liters whatever the shape
I started from the odds that I was reported and that according to the manufacturer the box has a volume of 60 lt, but I do not understand why with mass property gives me a volume of 17.5 lt
I attach photos to better clarify the problem and if I have done correctly the right steps
I first created a simple extrusion with the required dimensions, then I applied emptiness with thickness of 20mm, thickness required by the manufacturer, and then mass property and selected empty but the resulting value is 175..... mm^3
Where am I wrong?

I recreated the solid with ofset of 20mm on each side less so as to draw only the volume of the contents of your box/basket.
I basically replicated a money that represents the liquid that fills the box.
and actually as a result a volume of about 0.06 mt therefore indicating the volume indicated by your supplier... of 60 lt.I know so much that you measured the volume or weight of the container and not the volume that may contain.