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IMCornish
Posts: 255
Registered: ‎02-16-2009
Message 1 of 9 (354 Views)

Calculation of Void Volumes

354 Views, 8 Replies
02-05-2013 09:16 AM

I am working a little 'off piste' currently as I am usually designing buildings, however, I have been asked to design a mould for the casting of an additional mass of lead to be appended to the existing lead in the keel of a yacht.

In order to complete this exercise the volume of the mould must accomodate between 26 and 30 litres of lead which is the volume of lead required to give the correct weight.

I have begun this task by creating a new Revit Family (may have been better to create it in a Project Environment) essentialy beeing a large extrusion, with a number of swept blend voids creating the mould cut out.  I have determined this using my clients instructions for the type of cross sectional profile, its profile along its length and the footprint.  Thing is I now have to work out what alterations are necessary in order to ensure that the mould volume is correct!!

See 3D View so far.....

 

Volumes.png

 

Any helpful ideas please.

Andrew Robertson
Chartered Architect
Robertson Partnership
Truro. UK
*Expert Elite*
Alfredo_Medina
Posts: 2,813
Registered: ‎06-11-2009
Message 2 of 9 (338 Views)

Re: Calculation of Void Volumes

02-05-2013 12:08 PM in reply to: IMCornish

What is the question?

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Mentor
IMCornish
Posts: 255
Registered: ‎02-16-2009
Message 3 of 9 (324 Views)

Re: Calculation of Void Volumes

02-06-2013 02:53 AM in reply to: Alfredo_Medina

Sorry Alfredo, I need to know how to calculate the volume of the cut out.  I have since imported the family into a project environment and can see that the properties of the imported family, when selected, give a volume.  So I may have stumbled on the solution?

Since the volume was too much I have started a new family and am trying to modify each of the series of 'swept blend voids' but am finding that some refuse to join the others and will not cut the solid so if you have any ideas why this should happen then I would be glad of any suggestions!

Andrew Robertson
Chartered Architect
Robertson Partnership
Truro. UK
*Expert Elite*
Alfredo_Medina
Posts: 2,813
Registered: ‎06-11-2009
Message 4 of 9 (317 Views)

Re: Calculation of Void Volumes

02-06-2013 03:32 AM in reply to: IMCornish

You need to work with mass.rft , or with an in-place mass in a project. Revit can schedule the volume of masses, but only for solids, not for voids.

 

So, you have 2 options:

  • Option 1) model the voids as solids, and run a schedule of masses that includes the "gross volume" parameter
  • Option 2) Do as Archimedes did: if you know the volume of the initial bounding box, then, use the schedule to calculate the volume of the resulting solid part. Then subtract that resulting volume from the volume of the original box, and that's the volume of the void part.
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Planta1 Revit Online Consulting | info@planta1.com | my Twitter | The Planta1 Blog
Valued Mentor
AJA14
Posts: 489
Registered: ‎11-01-2011
Message 5 of 9 (314 Views)

Re: Calculation of Void Volumes

02-06-2013 03:39 AM in reply to: Alfredo_Medina

Hi. Just an addition to what Alfredo said, you could try creating the two masses (one complete and one with the voids) but place them in two different phases. That way you can schedule both in the same project and get the resulting void volume. Good luck.

Ali Al-Hammoud
Structural Design Engineer
MZ & Partners Engineering Consultancy
Mentor
IMCornish
Posts: 255
Registered: ‎02-16-2009
Message 6 of 9 (298 Views)

Re: Calculation of Void Volumes

02-08-2013 03:57 AM in reply to: AJA14

I have found an easier way, which is to import the family into project and select it.  The object 'properties' listings then includes a Volume parameter for the resultant solid. By subtracting this from the Volume of a similar but uncut (no voids taken from it) family you get the volume of the voids.

Arising from this I would like to create a 'Volume' tag but cannot find the 'Volume' parameter in the label possibilities.  Any ideas how to solve this issue please?   

Andrew Robertson
Chartered Architect
Robertson Partnership
Truro. UK
Mentor
IMCornish
Posts: 255
Registered: ‎02-16-2009
Message 7 of 9 (297 Views)

Re: Calculation of Void Volumes

02-08-2013 04:00 AM in reply to: Alfredo_Medina

Alfredo, see my response to the second reply, adding to your comments.  You will see that I used the Archimedes principal without needing to resort to a schedule.

Be pleased if you could apply your knowledge to answering my further query regarding the tagging of a volume.

Thanks again. 

Andrew Robertson
Chartered Architect
Robertson Partnership
Truro. UK
*Expert Elite*
Alfredo_Medina
Posts: 2,813
Registered: ‎06-11-2009
Message 8 of 9 (287 Views)

Re: Calculation of Void Volumes

02-08-2013 04:43 AM in reply to: IMCornish

If the objects are masses, they can be tagged with the tag for masses, which can be edited to include a label for gross volume parameter.

 

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Planta1 Revit Online Consulting | info@planta1.com | my Twitter | The Planta1 Blog
mc
New Member
mc
Posts: 1
Registered: ‎05-31-2013
Message 9 of 9 (88 Views)

Re: Calculation of Void Volumes

04-28-2014 11:03 PM in reply to: Alfredo_Medina

How can I add weight parameter (under dimension properties in instance). In family I can not see Volume parameter wchich I want tu use to calculate Weight. I need to see weight of the beam/column/wall in isnatces properties.

Any helpful Ideas please.

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