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Smartyphone Speaker Box

post #1 of 23
Thread Starter 
I'm building a speaker box for smartphones and I need to calculate the radius of the smallest circle that will pass through two corners of a rectangle.



Any suggestions?


Edited by billbartuska - 7/2/16 at 6:37am
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post #2 of 23
This might help you.
https://www.youtube.com/watch?v=IsnCpn_cNW4
post #3 of 23
Thread Starter 
Quote:
Originally Posted by thrasherht View Post

This might help you.
https://www.youtube.com/watch?v=IsnCpn_cNW4
Thanks, but close only counts in horseshoes and hand grenades!

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post #4 of 23
Thread Starter 
bump
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post #5 of 23
Miss read the post above , ignore this .
Edited by TwirlyWhirly555 - 7/17/16 at 4:53am
    
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post #6 of 23
The answer is that there are multiple sizes of circle that would fit what you describe.Anything with radius larger than the long side of your rectangle will fit, and you'll have a different curve depending on what size circle you choose.
    
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post #7 of 23
Thread Starter 
Quote:
Originally Posted by Ergates View Post

The answer is that there are multiple sizes of circle that would fit what you describe.Anything with radius larger than the long side of your rectangle will fit, and you'll have a different curve depending on what size circle you choose.
Not to be rude. but....................



As you say, there are there are multiple radii that will fit, but I need the smallest.

One long side of the rectangle would be tangent to the smallest circle. and that's what I need.
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post #8 of 23
Not sure I'm understanding the problem, but if you need the smallest circle to pass through 2 points (on a rectangle or anything else) then you need a circle that is the diameter of the distance between those two points.
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post #9 of 23
Thread Starter 
Here. I need to make the red part.




I have the tools to make it and SolidWorks will get me the radius, but I'd really like to know how to do the math.
Edited by billbartuska - 7/19/16 at 1:26pm
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post #10 of 23
You're right, I missed your comment about needing the smallest radius. Sorry

Does it really have to be the smallest radius? Why don't you go slightly bigger, by a few mm, and be sure it will fit? The back end will still be a proper tangent, and the front one will be so few bare fractions different that it probably won't matter.
    
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LG Blu Ray RW Noctua NH-D14 Windows 8 Dell 2405FPW 
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Ducky Shine II, Cherry MX Blues, White LED full... Corsair HX850W Corsair 600 T White special edition MS touch mouse 
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OCZ Agility 3  WD Black 2TB WD Green 2TB WD Black 1TB 
Optical DriveCoolingOSMonitor
LG Blu Ray RW Noctua NH-D14 Windows 8 Dell 2405FPW 
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