Gary Beasley
PRO Member
Does the software have the capability to calculate the volume of a vessel created in it? That would be quite helpful in creating properly sized urns for cremations.
Volume calculations?
- Thread starter Gary Beasley
- Start date
Hi Gary:
Both WTP and SP calculate volume of the vessel.
- In WTP the volume results is located in the bottom right of the information bar
- In SP the volume results is located in the Cutaway view, right side information.
Gary Beasley
PRO Member
Thanks! I’ll need to look at that.
DaveJ
PRO Member
Just popped in as I have a question relating to the volume shown in WTP versus the volume on STP. I constructed the Urn in STP and then copied the inner and outer diameters to WTP and the volumes are different. I use metric and my vessel in STP says it is 4.38 litres and WTP says it is 6495mm and I can't make sense of it.
I want to construct the Urn using WTP but want to get the correct volume. Perhaps I should make the plan then convert it to imperial and get the cubic inches? I am not that good with maths and the first one I made came out smaller internally than I expected.
I want to construct the Urn using WTP but want to get the correct volume. Perhaps I should make the plan then convert it to imperial and get the cubic inches? I am not that good with maths and the first one I made came out smaller internally than I expected.
I use the same truncated cone formula and method in both programs. A truncated cone can have the point up or down depending on the wall profile at any elevation. All I’m interested in is the inner diameter. I make a truncated cone for every ring. I start at row 2 because row 1 is a disk. I take the inside diameter of row 2 and the inside diameter of row 3 and that determines how tall the cone is that will be truncated. If the diameters are identical I switch to a cylinder of the height of the row. If it is a truncated cone, I truncated it to the height of the row. I add the truncated cones or cylinders for each row and stop three rings from the top because that is likely where the plug will be placed. There’s your volume.
Is this perfect? Nope. Far from it. The Bézier curve of the wall profile isn’t even considered. I build software for designing segmented bowls and volume isn’t even a consideration. Solid works or the like will give you perfect volume but they aren’t great for designing segmented bowls. But the truncated cone method is close because trigonometry is pretty darned accurate,
You know what else isn’t accurate? The thought that the ashes of a 200 pound deceased person equals 200 cubit inches. Test this 10 times and you’ll have results all over the board.
The truncated cone formula is easy to find. Both Segment PRO and Woodturner PRO show you the inside diameters of every row. Put it in a spreadsheet and test away which is what I did when I wrote the code. I designed Woodturner PRO but was not the programmer but I gave him the formula and instructions and have no reason he didn’t do it correctly. His coding prowess is an order of magnitude better than mine. I’ll be happy to hear your results.
Here’s a pro tip. Upload the .csv Summary file of Woodturner PRO or the spreadsheet from Segment PRO’s Summary to ChatGPT and ask for the volume based on the inside diameters and row thickness of each row.
With regards to metrics, every measurement in all of my software is kept in digital inches. At display time, I convert it to metrics. If the conversion is wrong, you’ll have to talk with my metrics expert. Oh, wait. I don’t have a metrics expert. :-<
Is this perfect? Nope. Far from it. The Bézier curve of the wall profile isn’t even considered. I build software for designing segmented bowls and volume isn’t even a consideration. Solid works or the like will give you perfect volume but they aren’t great for designing segmented bowls. But the truncated cone method is close because trigonometry is pretty darned accurate,
You know what else isn’t accurate? The thought that the ashes of a 200 pound deceased person equals 200 cubit inches. Test this 10 times and you’ll have results all over the board.
The truncated cone formula is easy to find. Both Segment PRO and Woodturner PRO show you the inside diameters of every row. Put it in a spreadsheet and test away which is what I did when I wrote the code. I designed Woodturner PRO but was not the programmer but I gave him the formula and instructions and have no reason he didn’t do it correctly. His coding prowess is an order of magnitude better than mine. I’ll be happy to hear your results.
Here’s a pro tip. Upload the .csv Summary file of Woodturner PRO or the spreadsheet from Segment PRO’s Summary to ChatGPT and ask for the volume based on the inside diameters and row thickness of each row.
With regards to metrics, every measurement in all of my software is kept in digital inches. At display time, I convert it to metrics. If the conversion is wrong, you’ll have to talk with my metrics expert. Oh, wait. I don’t have a metrics expert. :-<
DaveJ
PRO Member
Thanks Lloyd for replying so quickly and your excellent explanation. I still haven't gotten round to making an urn like the one you sent the files for as I need to improve my segmenting skills first, (something I can do
)but I am happy with my first attempt. Right, I'm off to start Urn number 2.