Hello, our team has been tasked with completing some drawing that are pretty tough. The pic is one I could really use some advice on. It's a foam piece used as a medical device. The 'pinched' places are sewn together. Any idea how to go about this?
Thanks in advance!!
Minimum four different views are needed to see the exact topology of the part as like first or third angle projection.
This is the order. I think “Help Model this part” is the most suitable title.
I don't have time to model it now, but a series of Lofts, using some guide curves, would probably be a good option. It looks like it's symmetric in at least one direction, so I'd recommend modeling a portion and then complete the model with one or two Mirrors.
Glenn - one Loft is enough and three mirrors
How accurately do you need to model it? If not too accurately you can "wing it" with some rough dimensions, sketches and lofts as Glenn suggested.
If you need this to be more accurate, I'd suggest cutting sections to use to create the sketches. But, it's foam so when you cut it, it'll lose it's shape at the transitions created by the creases. So, you could do something inventive like using some type of resin, epoxy or glue to absorb and set in the foam to make it hold it's shape. Then you could slice it into thin sections and scan the sections to scale (you could use a copier). Then you'd add those images to sketch planes, line them up and use them to make your loft sketches. If you have some time and need more accuracy, then this may work.
Maybe if you explain exactly what you need and why in more detail people may be able to give you more targeted advice? Flexible foam isn't something that I'd guess too many SW people deal with on a regular basis.
Matt, oh, oh... 3D Scan? I do not think so. Accuracy is not needed here because the material and technology of manufacture does not ensure repeatability..An idea with a resin - not in this case. I suspect that this is only needed for visualization.
Sorry for the lack of info!!! dimensions are:
Overall length: 36"
Foam thickness: .5"
Foam width: 3"
first pinch (sewed part) is at: 14" from either end
Space between pinches (sewed parts) is: 8"
Thank you all for your help. It's the curves of the foam up to the pinches (sewed parts) that have me stuck...never done anything like this before. Let me know if you need any more info.
..open or closed cell foam?
Paul, it looks different at the seam.
I also modeled threads and holes on them. No... I'm kidding
Krzysztof, thank you so much!! How did you curve the sweep to come together like that? You guys are CAD ninjas...
Its simply if you find good way for it.
Of course, this can be done in a hundred other ways (especially when working on newer versions than 2012). I prefer the quick ones.
Krzysztof Szpakowski wrote: Paul, it looks different at the seam.I also modeled threads and holes on them. No... I'm kidding
Krzysztof Szpakowski wrote:
I guessed that it didn't really need to be "that accurate". So, I'd assume that Paul's model would be sufficient.
I do agree that there may be some variance between different pieces. But, I stand by my original post. A 3D scan is out of most people's reach (but definitely would be the most accurate). Sometimes being a little creative and using available tools will get the job done. Of course as Paul also noted this may depend on whether it is closed cell or open cell foam. One would be able to absorb "glue" and set. The other would not (if I understand it correctly).
Matt Peneguy wrote:[...]Krzysztof,I guessed that it didn't really need to be "that accurate". So, I'd assume that Paul's model would be sufficient.[...]
Matt Peneguy wrote:
I will not quite agree. It is possible to set the thread tension so that the model will look like the Paul version (which does not correspond to the actual model). So if we model we have to show that the material at the seam is compressed.
Closed-cell foam is better for your idea. Several thin layers of resin will harden this structure. Open cells must be treated in the same way as closed cells. You cannot soak the foam with resin because its weight will deform the model.
Paul this is AWESOME! Thank you!! How did you go about doing it?
Hello Josh,.. I attached it above.. good luck!
Thank you Paul!!!!!!
It is a very nice an intelligent approach. Thank you.
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