base
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Re: base
Thanks.
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PA 2009, 1st Bridges : 2010, 1st Bridges, 1st WM : 2011, 1st ED, 3rd Towers, 4th Heli
Nats Augusta 2009, 4th Bridges : Illinois 2010, 3rd Bridges, 9th ED : Wisconsin 2011, 3rd Heli, 5th Towers : Orlando 2012, 2nd ED, 5th Towers
Event Supervisor Balsa, ED
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PA 2009, 1st Bridges : 2010, 1st Bridges, 1st WM : 2011, 1st ED, 3rd Towers, 4th Heli
Nats Augusta 2009, 4th Bridges : Illinois 2010, 3rd Bridges, 9th ED : Wisconsin 2011, 3rd Heli, 5th Towers : Orlando 2012, 2nd ED, 5th Towers
Event Supervisor Balsa, ED
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Re: base
Going back to SLM's diagram.....
If you extend the line of member #1 (the vertical upper leg) straight down, and,
call the angle between it and the sloped lower leg (#2) "b", and
call the vertically applied force (down through #1) F1, and the force on #2 F2
Let's say we're talking about a 3-legged tower, with a 15 kg load. Each leg is carrying 1/3 of the load, so F1=5kg
then, F2 = F1 x (1/cos b). You can get to this relationship either thru vector addition, or empirically playing around in the jhu app (mentioned/link to it provided previously)
so, if #2 were vertical, F2 would =1 x F1, or 5kg;
if #2 is at 8 degrees from vertical (b=8 degrees), F2 = F1 x (1/0.9902) = F1 x 1.0099, or 5.05 kg
or if #2 is at at 16 degrees from vertical (b = 16 degrees), F2 = F1 x (1/0.9611) = F1 x 1.0405, or 5.2 kg,
and, if #2 is at an angle of 28 degrees from vertical (b = 28 degrees), F2 = F1 x (1/0.8833) = F1 x 1.1322, or 5.66 kg.....
If you extend the line of member #1 (the vertical upper leg) straight down, and,
call the angle between it and the sloped lower leg (#2) "b", and
call the vertically applied force (down through #1) F1, and the force on #2 F2
Let's say we're talking about a 3-legged tower, with a 15 kg load. Each leg is carrying 1/3 of the load, so F1=5kg
then, F2 = F1 x (1/cos b). You can get to this relationship either thru vector addition, or empirically playing around in the jhu app (mentioned/link to it provided previously)
so, if #2 were vertical, F2 would =1 x F1, or 5kg;
if #2 is at 8 degrees from vertical (b=8 degrees), F2 = F1 x (1/0.9902) = F1 x 1.0099, or 5.05 kg
or if #2 is at at 16 degrees from vertical (b = 16 degrees), F2 = F1 x (1/0.9611) = F1 x 1.0405, or 5.2 kg,
and, if #2 is at an angle of 28 degrees from vertical (b = 28 degrees), F2 = F1 x (1/0.8833) = F1 x 1.1322, or 5.66 kg.....
Len Joeris
Fort Collins, CO
Fort Collins, CO
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Re: base
You are underestimating your mind's ability to comprehend seeming difficult content. Spend more time thinking about it, ask questions, discuss it with your coach or teacher ...Bubba1960 wrote:O_O
My mind cant comperhend stuff like that...
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Re: base
SLM wrote:You are underestimating your mind's ability to comprehend seeming difficult content. Spend more time thinking about it, ask questions, discuss it with your coach or teacher ...Bubba1960 wrote:O_O
My mind cant comperhend stuff like that...
also, because this forum is not LaTeX enabled, stuff like this looks a lot messier than it actually is.
West Windsor-Plainsboro High School South
- lllazar
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Re: base
Think about how the force on the member changes as the angle changes from vertical. Read it over a few times.Bubba1960 wrote:O_O
My mind cant comperhend stuff like that...
2011 Season Events~
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Hooray for getting everything i wanted?
Fossils (Regionals ~1st) (State ~6th)
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Re: base
LaTex is you just need to use theiYOA wrote:SLM wrote:You are underestimating your mind's ability to comprehend seeming difficult content. Spend more time thinking about it, ask questions, discuss it with your coach or teacher ...Bubba1960 wrote:O_O
My mind cant comperhend stuff like that...
also, because this forum is not LaTeX enabled, stuff like this looks a lot messier than it actually is.
Code: Select all
[math][/math]
- lllazar
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Re: base
So i finally got around to uploading pics of my base jig today, they should be in the gallery as soon as they get validated.
2011 Season Events~
Fossils (Regionals ~1st) (State ~6th)
Towers (Regionals ~1st) (State ~3rd)
Helicopter (Regionals -3rd gahhh) (State ~5th)
Wind Power (Regionals ~1st) (State ~3rd TIERED!)
Hooray for getting everything i wanted?
Fossils (Regionals ~1st) (State ~6th)
Towers (Regionals ~1st) (State ~3rd)
Helicopter (Regionals -3rd gahhh) (State ~5th)
Wind Power (Regionals ~1st) (State ~3rd TIERED!)
Hooray for getting everything i wanted?
- lllazar
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Re: base
No i use 1/8 why do you ask?
If your talking about the small size of the edge slots which hold the legs in place while assembling, the edges are two 3/32 squared pieces, i did this so that theres less of a chance of the leg sticking to the edge piece - if the edge was exactly 1/8, the 1/16 cross bracing would come RIGHT over the edge piece, so it'd be a tight situation the way i saw it.
This still works fine though, im open to any more questions.
If your talking about the small size of the edge slots which hold the legs in place while assembling, the edges are two 3/32 squared pieces, i did this so that theres less of a chance of the leg sticking to the edge piece - if the edge was exactly 1/8, the 1/16 cross bracing would come RIGHT over the edge piece, so it'd be a tight situation the way i saw it.
This still works fine though, im open to any more questions.
2011 Season Events~
Fossils (Regionals ~1st) (State ~6th)
Towers (Regionals ~1st) (State ~3rd)
Helicopter (Regionals -3rd gahhh) (State ~5th)
Wind Power (Regionals ~1st) (State ~3rd TIERED!)
Hooray for getting everything i wanted?
Fossils (Regionals ~1st) (State ~6th)
Towers (Regionals ~1st) (State ~3rd)
Helicopter (Regionals -3rd gahhh) (State ~5th)
Wind Power (Regionals ~1st) (State ~3rd TIERED!)
Hooray for getting everything i wanted?
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