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Old 07-16-2013, 03:31 PM
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Default Make more accurate boxes with Sketchup

Couple of tips I wanted to share with everyone who might not know about this.

I'm sure many of you know about the "entity info" tab on Sketchup. What I'm going to show you is a couple of ways you can use it to accrately calculate the internal volume of your box overall, and figure out how much airspace is displaced by bracing.

I've found it especially useful in finding the volume of oddly shaped enclosures and curvy bracing. The less math you have to do, the better, right?

So for starters, you're going to need your completed enclosure (minus the top) in a group. I find it easier to group each piece of the box individually as i'm designing, but more on that later.

Select your entire enclosure, right click on it, then click on "make group". Should look something like this:


Next, draw an outline of the inside of your enclosure from the top (or bottom), Like this:


Then, use the push/pull tool to bring it down. Make sure you fill all the crevices. After you've done that, triple click the shape you just made, right click, select "make group".


After that, go to Window> Model info and you should come to a screen like this. Click on units, then click the drop down menu pictured, and select engineering. Then close that window.


Right click on the shape you just made and select entity info.


This window should pop up somewhere on your screen giving you all the stats about the shape you just made, INCLUDING the volume in cubic feet.


Then you can do the same thing to your bracing (so long as it's in a group/component)
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Old 07-16-2013, 03:43 PM
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45's get a little bit trickier though. Since entity info only measures the volume of the shape that in a given group, the previous method won't be accurate.

The piece of wood alone on this 45 would take up this amount of space if it were just sitting somewhere flat inside the box.


But since it's at a 45 degree angle against a floor and a wall, the airspace behind it is not part of the enclosure's volume. So make a triangle the same size as your 45 like this, and the numbers will be accurate.
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Old 07-16-2013, 04:28 PM
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Thanks for pointing that out. I was just selecting the surface area and multiplying by the height. :-P
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Old 07-16-2013, 04:37 PM
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Just realized I included the "port" in the volume of the front chamber.

Don't do that lol.
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Old 07-16-2013, 04:40 PM
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that box is gunna flex like crazy. otherwise seems like some good hints!
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Old 07-16-2013, 04:47 PM
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Originally Posted by Anton Miller View Post
that box is gunna flex like crazy. otherwise seems like some good hints!
The dude has 5 sheets of 1 1/8" MDF, and not a penny more to spend for bracing or extra wood lol. Might toss around some more idears with bracing, but that's a story for another time.
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Old 07-16-2013, 05:21 PM
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Originally Posted by GPCustoms View Post
The dude has 5 sheets of 1 1/8" MDF, and not a penny more to spend for bracing or extra wood lol. Might toss around some more idears with bracing, but that's a story for another time.

the port all is going to flex like nuts. brace it more. redesign the rear chamber so it attaches to it.... will help everything. haha
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Old 07-16-2013, 05:27 PM
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the port all is going to flex like nuts. brace it more. redesign the rear chamber so it attaches to it.... will help everything. haha
That's double layered. I'll look into more bracing though.
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Old 07-16-2013, 05:32 PM
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that's only 2.25" thick. looks to be about what 33" tall? from experience... it will flap in the wind, move close to an inch each way in the center. it will require a brace. also when designing what looks to be a wall.... you can use the actual vehical to brace the enclosure. attach your shell to the car then build around your shell. ect. can reduce ALOT of your internal bracing by using the outside of the box.

blah blah ect ect...
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