What is Reverse Engineering with Parametric Modeling and a History Tree?


Hello, my name is Swann with the 3D scanning
and reverse engineering company Holocreators. Today I want to answer the question, “What
is a Reverse Engineering with Parametric Modeling and a History Tree?” Well, with this reverse engineering technique,
we can convert a 3D scan into the native CAD format of the client—so, directly into the
CAD system with which the client is working. This entire history tree is included inside
the model and can be modified. So, this is not a copy of this part, but it’s
much more an optimized and idealised version. So, manufacturing defects are corrected and
it’s much more the attempt to go back to the original design intent of the part. I want to make an example. Imagine the client is working in the CAD system
FreeCAD. So, we, now we would do a reverse engineering
of the 3D scan in FreeCAD and create the parametric model and then we would export the files in
the native CAD format of FreeCAD, which is .FCSTD, so the client would be able to import
this FCSTD file into his FreeCAD and he would have access to the entire history tree. To show you how to adjust the history tree
I have prepared this example here. You can see me changing the parameters and
thus modifying the shape of this sphere here in the middle. This we can not only do for FreeCAD but for
any CAD system on the market. So, for any CAD program we can create a parametric
model with a history tree. How do we do this? Well, in the first step, we do the reverse
engineering with solid modeling and we accurately replicate the 3D scan as a solid model. And this solid model we then import into the
same CAD software that the client is using and we create the parametric model on top. So, the entire thing is pretty much a double
reverse engineering. What is the main purpose of this reverse engineering
technique? Well, I said it at the beginning. It’s to create a parametric model with a history
tree, and the task is to optimize the original 3D scan. To demonstrate this, I have brought our Holocreators
demo part here. This is a part that was 3D printed, and what
we did next is we made a 3D scan of this part. You can see there in the video we used the
GOM Core scanner that’s a structured light scanner, and scanned the part, and the result
was this 3D scan up here. And then in the next step, I superimposed
the parametric model with the 3D scan. And now, you can see in the deviation report
how in some areas we have more deviation. And that’s because, well, when you have
3D printed parts is that you have, often times, deformations—so manufacturing defects. And because the parametric model is an optimized
shape, we can see the deviations where the plastic was sagging. Let’s talking about the advantages and disadvantages
of this reverse engineering technique. Well, the advantages are that, of course,
the client can modify the entire part. He has access to all parameters of this part. Another advantage is that the file size is
pretty small because the model is very efficiently designed. And also we have the option to export a technical
drawing from the parametric model. And, of course, every reverse engineering
we also deliver with a deviation report that documents for you the deviation between the
3D scan and the parametric model. What are the disadvantages of this reverse
engineering technique? Well, it’s a lot of work, because first we
create the solid model and then, based on that, the parametric model, so it’s quite
complex. Another disadvantage is the deviations. In comparison to other reverse engineering
techniques, we do a lot of optimization here, and that results in a bigger deviation between
the 3D scan and the parametric model. So, on average we are talking between 0.05mm
and 0.25mm between both parts. All the sample data I will make available
for you to download—the original 3D scan, the parametric model for FreeCAD, and also
the deviation report. By the way, FreeCAD is a free software, so
you might as well download that, too, and then you are able to import our parametric
model and also take a look, or even modify, the history tree. All the files I will put on our website, holocreators.com,
but I will also put the download links into the video description. Let me do a quick recap. So, the reverse engineering with parametric
modeling and a history tree creates a parametric CAD model in the same CAD software that the client is using. So the client will be able to just import it and alter the entire history tree. So its therefore ideally suited if you want to have full control but also if you need an optimized part. Or a part with a technical drawing. We make this reverse engineering for any CAD software on the market. So, for any CAD software on the market, we will provide you with a native CAD format that you can directly import into your CAD software. And also with every reverse engineering we will provide a deviation report that shows you the deviation between the original 3D Scan and the parametric model, so you check the accuracy of our work. Like I said at the beginning, Holocreators
is a 3D scanning and reverse engineering company. So, we also do the reverse engineering with
parametric modeling and a history tree. If you ever need help with any reverse engineering
projects or 3D scanning, I’m very happy to help. My contact details you will find on our website,
holocreators.com I will also put it here. Otherwise, you can also find them inside the
video description. Until then, have a great day. Bye-bye.

Comments 2

  • Holocreators is a 3D Scanning company. We offer 3D Scan and Reverse Engineering Services. We’d love to help you with your project, please get in touch with us: https://holocreators.com/

  • This is so good. Please make more. Also, let's Be friends :O

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