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Old 03-01-06, 06:02 PM   #1
phantomcow2
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Adding stiffness to this parallelogram

Imagine a parallelogram. It is made from aluminum extrusion for the longer legs of it, and aluminum plate for the sides.

__________
|_________|

I believe with the loads this will see, this parallelogram will try to make more of a rhombus

________
/______/

That is not acceptable. I was thinking just get a plate to mount in the back of this parallelogram, that would add excellent resistance to twisting. But, though my stock pile is pretty good, its not that good!

So my thoughts were to add angle supports, like this

===========
||/\/\/\/\/\/\/\/\||
===========

Except these angle supports would actually be touching the other material!

So my question is, what would be the angle of these angle supports to maximize resistance to deforming?

THis all has to be much more overbuilt than I had expected, for all I know I might have a 4HP motor in the middle of this...
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Old 03-01-06, 06:05 PM   #2
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Just went I thought I was logging into foo to unwind from a busy day, you throw this at me?
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Old 03-01-06, 06:10 PM   #3
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Oh man, I'm not even gonna try to help you on this one...no clue
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Old 03-01-06, 06:19 PM   #4
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There must be some mathematical way to figure this out. I've not taken physics or statics and dynamics yet
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Old 03-01-06, 06:24 PM   #5
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I've not taken physics or statics and dynamics yet
wanna buy my statics/dynamics book? its barely used! (my transcripts will back me up on that)
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Old 03-01-06, 06:53 PM   #6
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Use a thin matrix of honey combs. It's the strongest structure for the most volume inside (meaning the least amount of material for the walls).
Or stick a couple of arches in there, also one of nature's strongest forms.
Why use your brain when you have 2 billion years of evolution behind you?
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Old 03-01-06, 06:53 PM   #7
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I'm beginning to think this guy's the Merton of engineering..

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Originally Posted by blonduathlongrl
Just went I thought I was logging into foo to unwind from a busy day, you throw this at me?
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Old 03-01-06, 06:55 PM   #8
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45 degrees
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Old 03-01-06, 06:57 PM   #9
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Jeez, what good is cereal gonna do?
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Old 03-01-06, 07:02 PM   #10
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Quote:
Originally Posted by slvoid
Use a thin matrix of honey combs. It's the strongest structure for the most volume inside (meaning the least amount of material for the walls).
Or stick a couple of arches in there, also one of nature's strongest forms.
Why use your brain when you have 2 billion years of evolution behind you?
Thanks, I was hoping for a reply from you.
By Honeycomb, do you mean something like this?


As for the arch, I see that more as a resistance for loads as if a person was pushing from ontop. The extrusion is very solid, plenty to resist this. I dont see much how the arch would help this thing from turning into a Rhombus.
THe honeycomb idea is great, might be a little complicated to make, but I think it could be done...
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Old 03-01-06, 07:06 PM   #11
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estimate the loads in both directions, one load going straight down, one load going to the right. Lets say the load is 4 down, 3 to the right, so the hypotenuse would be 5. The angles here would be 36.87 and 53.13.
That should work. Just don't put a 5hp engine in.
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Old 03-01-06, 07:08 PM   #12
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Make sure it doesn't go past 400 watts or it'll drop you like a poser and you'll never catch it.
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Old 03-01-06, 07:10 PM   #13
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Well it wont be an engine really, it would be a wood router. I have a 4HP servo motor that I might try to use for a spindle, I am overbuilding everything just incase I use that someday
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Old 03-01-06, 07:11 PM   #14
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Quote:
Originally Posted by slvoid
I'm beginning to think this guy's the Merton of engineering..
Difference: PC has an idea what he is talking about
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Old 03-01-06, 07:15 PM   #15
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Quote:
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I'm beginning to think this guy's the Merton of engineering..
whoa!!! that was a little harsh..
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Old 03-01-06, 07:17 PM   #16
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Quote:
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Difference: PC has an idea what he is talking about
Then he'd be the one giving answers. :-p
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Old 03-01-06, 07:27 PM   #17
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Well, like i've said, I have not taken a physics course yet or anything like it (signed up for next year). I want to build this thing right the first time, so this project has dragged and dragged on as I gather parts, knowledge, all of that. The frame of this SHOULD be done in 2 weeks.
ALl .5" anodized black aluminum, except .75" in some places. Should be rock solid...
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Old 03-01-06, 07:30 PM   #18
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45 degrees
Agreed. You'd essentially be creating a truss- very strong. That's why you see them in all the large buildings...

Oh, and it'd be statics you'd want for the question...
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Old 03-01-06, 07:39 PM   #19
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Plate gusset the corners or truss your parallelogram with tube
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Old 03-01-06, 07:40 PM   #20
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Yea 45 degrees was my plan, I wanted to see if anybody else would agree. I've also heard 30 degrees suggested, but for 30" unsupported length with two parallel bars that are 9" apart, i think 45 is better.
Maybe one of my teachers has taken statics and can help
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Old 03-01-06, 07:42 PM   #21
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Plate gusset the corners or truss your parallelogram with tube
Already got the Gussets
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Old 03-01-06, 07:43 PM   #22
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simply connect the corners diagonally. Make an "X"
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Old 03-01-06, 07:43 PM   #23
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Honestly its not going to matter, aluminum is stiff as hell and either 30 or 45 will work for that application.
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Old 03-01-06, 08:01 PM   #24
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wrap in in duct tape, the strongest material in the universe
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Old 03-01-06, 08:10 PM   #25
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wrap in in duct tape, the strongest material in the universe
+1

duct tape for the win!
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