Precision Modeling LIVE!

This week, @TheOnlyAaron will be doing some precision modeling in SketchUp using ONLY native tools. Impossible you say? Join the live and found out if he can do it!


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Yes!! Let’s do some machine part modeling!! I will upload images that I will be using on Friday morning for anyone who wants to follow along!

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Looking forward to it. The one Donovan shared is missing some important info for “precision” modeling. :wink:

the unit ?

I mean, knowing Aaron, this could be a piece of the death star. Meaning it could well be 63kmØ :smiley:

No. Units would be assumed to be millimeters. There are a lot of missing dimensions like the width of the bottom of the groove, depths of the recesses, through-hole diamters, etc.


You mean there’s another way?

Maybe it’s about precise modeling based on a drawing as a background?? But precision? Modeling - still works (if you use much segments in curve). But precise modeling is not just art for art’s sake, it is related to the so-called machine drawing. And here Layout unfortunately has to give up due to its limitations. No possibility of dimensioning diameters and radii, No dimensioning with tolerances, I can’t imagine dimensioning the precise minimum distance between arcs and circles, the same with dimensioning deflection arrow. All workarounds to these limitations result in a lack of precision and waste of time, unfortunately…

Oh, really? This was done in LayOut. Parts are being made from the drawings as I type.


One more thing. In the technical drawing, Cener lines are placed on the rotary solids. Also in the holes. In the centers of circles. JI in your drawing doesn’t have a single diameter or radius dimension. These are linear dimensions, I don’t know if you know the difference. but I know many use them to dimension arcs and circles which doesn’t provide accuracy, especially with a large number of segments.

They were done to the standards required by the client.

There’s plenty of space on the drawing for whatever information is required.

I hope you have at least one drawing that complies with standards other than the client’s??

I can make the drawings comply with whatever standards are required. In this case I used the standards as required by the client because they were the ones paying the bill. The point it, it’s easily done in LayOut.


Of course it’s possible, if you don’t know how to do it doesn’t mean that it’s not doable, there’s the false belief that sketchup and layout can’t be used to precise modeling, I’ve used for years in my field, architecture, creating drawings as big as a building and also details of nails or screws with high precision.

Architecture is a specification of a few millimeters, mechanics - 5 hundredths of a millimeter, Can you see the difference? Just because something can be done with a tool doesn’t mean it’s meant to be. Can you hammer screws? You can! There are people who paint amazing things with MS PAINT. They have talent, knowledge of colors, perspective, etc. But… they lose their lives… their time… I also know how to “cheat” these dimensions in Layout. but as i say it is not real dimension. Often burdened with an error resulting from the fact of interpolating curves to segments. But since you know “everything” and stick to your opinion, tell me how you will dimension the deflection arrow in LO from the example below??

Which dimension do you consider “precise”? The blue arc and the last dimension are theory. The polygon is curve interpolation by SU. As you can see, even for architecture this precision can fail. And when you have a lot of sides and a very small object, how sure are you which point has chosen SU/ LO to measure?

Create the arc with an even number of uniform-length segments. That way, a vertex will be placed at dead center of the arc, at the proper radial distance from the chord.


Precision modeling is not arc modeling. When you model, you often trim the geometry, you set the center of the circle at a certain distance from the edge, etc. The arc and chord are the result! Of course I can replace the result according to your concept but it’s not my concept of work. And they are still workarounds and a waste of time. And there are programs (imagine) where I don’t have to do it or think about it. Do you still think that a program that can cause such errors in dimensioning is suitable for precise drawings? Where one mistake can cost thousands of dollars? You will say: Sorry I didn’t notice? Will you check every dimension inserted by your employee because you are financially responsible? What if there are dozens of employees?

But I agree with you. SU is unbeatable. Boeing is also set to switch to this program. They will save millions.

Finally some precision modelling ^^
Hope we won’t hear “thats about right” this time haha :wink:
Looking forward to it!

Did I say anything remotely like that? No, I did not. I addressed a specific critique that you mentioned.

In my opinion (which you insultingly and wrongly assumed!), one of SketchUp’s greatest weaknesses is how it represents circles and circular arcs as line segments. There are ways to mitigate some of the resulting poor effects, but this aspect of SketchUp remains a sore point. It is not enough of a sore point to make me switch to another modeling application.


Let’s get this thing back on track… Here are the five images I was thinking of modeling… i guess I see a missing dimension or two as an opportunity to problem solve! We will see what happens… LIVE!



This should be an interesting challenge! Those studycadcam drawings have, in my experience, an (intentional?) combination of missing dimensions and dimensions placed in confusing ways that force you to do deductions and math to figure them out. Struggles to understand the drawings are a whole different issue than managing to draw them in SketchUp.