Troubleshoot geometric errors

Tutorial series: Introducing Shapr3D basics

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What you'll learn

Why do errors sometimes come up while you’re modeling? Learn why geometric errors occur and how to go about troubleshooting them with this walkthrough of shelling a motorcycle frame.

Transcript

00:00

To do this shell, we'll try the SBI method, Selection Based Interface. So we'll select all the faces that we want to include in this shell. We want to remove these faces. And we'll just speed this up a little bit.

00:21

And with that selection, Shapr3D has narrowed down the types of features that I could be looking for. It knows I want a shell. And here's the arrow.

00:35

drag a thickness. Now there will be a range of thicknesses where this will work and a range where it won't work.

00:45

So let's see what happens as we drag the arrow. The operation failed because the resulting body wouldn't be valid. The arrow turns red and we get that little warning signal at the top of the screen. When the arrow is blue, it's working. Now this is not because there's any problem with the software. This failure is because just geometrically the curvature at some point inside probably has something to do.

01:13

with the intersection of these cylinders at an almost tangent. That's a rule of thumb with the shell feature is that small shell values generally work out better than large shell values. One reason you would want to have a model with an actual shell is to get a good weight approximation. And you do a weight approximation by measuring the volume of the entire body.

01:42

that case this is body four. So you've got almost 29 cubic inches of steel in the frame without the plate and you would need to multiply that by the density of steel to get your actual weight for the frame. There are other methods for modeling bent steel frames. Sweeping is just one of them. You could extrude, you could revolve, you could even loft.

02:06

depending on the needs in your particular situation. All CAD programs involve some workarounds now and then, and Shapr3D is not immune. So some of the methods I used here were a little unorthodox, but you have to be creative and understand how your tools work. Thanks for watching this set of videos. I hope you found them interesting and informative.

 

Try it yourself

Intro-Shapr3D-motorcycle.png
Motorcycle
Download
Intro-Shapr3D-Motorcycle-cover.png
Motorcycle cover
Download
Intro-Shapr3D-piston.png
Piston
Download
Intro-Shapr3D-piston-rod.png
Piston rod
Download
Intro-Shapr3D-rod-clamp.png
Rod clamp
Download
Intro-Shapr3D-Model-4-motorcycle-wheel.png
4 motorcycle wheel
Download
Intro-Shapr3D-frame.png
Frame
Download
Intro-Shapr3D-Model-block-casting.png
Block casting
Download

 

About the instructor

Instructor-Matt-Lombard.png

Matt Lombard is an independent product development professional, working in the field for 30 years. He has done a variety of work from plastics design and surfacing work to writing instructional and reference materials and writing about the engineering technology industry. Matt has also served as CAD Admin, PDM implementor, and engineering process consultant.




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