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Trigonometry Halp EX TEW!!

Blogs > Raithed
Post a Reply
Raithed
Profile Blog Joined May 2007
China7078 Posts
Last Edited: 2008-02-02 04:40:59
February 02 2008 03:40 GMT
#1
[image loading]


This is basically the upper side of this.

x = 6
y = 12
L1 = 12"
L2 = 10"

To find theta1, law of cosine again right? Then +90 to it? How about theta2?

Saracen
Profile Blog Joined December 2007
United States5139 Posts
February 02 2008 04:29 GMT
#2
theta 2 looks like it's 180...
where are your x and y
Chill
Profile Blog Joined January 2005
Calgary25978 Posts
February 02 2008 04:31 GMT
#3
Label x and y
Moderator
Raithed
Profile Blog Joined May 2007
China7078 Posts
February 02 2008 04:41 GMT
#4
done.
Saracen
Profile Blog Joined December 2007
United States5139 Posts
February 02 2008 04:48 GMT
#5
that's all the information we're given?
skyglow1
Profile Blog Joined April 2005
New Zealand3962 Posts
Last Edited: 2008-02-02 05:27:29
February 02 2008 05:26 GMT
#6
What are x and y referring to? The coordinates of the end of the yellow line? And is theta 2 drawn correctly? It looks like theta 2 is just 180 degrees..
Purind
Profile Blog Joined April 2004
Canada3562 Posts
Last Edited: 2008-02-02 05:32:57
February 02 2008 05:32 GMT
#7
Break it up into components:
x = L1cos theta 1 + L2 cos (something that is not theta 2t)

y = L1 sin theta 1 + L2 sin (some angle that is not theta 2)

2 equations, 2 unknowns

The "angle that is not theta 2" is an angle that the second arm makes with the horizontal (so draw an imaginary line going in the x direction, starting at the "start" of arm 2)

From this "angle that is not theta 2," you can find theta 2

I'm assuming x and y are the end coordintaes of the arm (the coords of where L2 is pointing to)
Trucy Wright is hot
Raithed
Profile Blog Joined May 2007
China7078 Posts
February 02 2008 05:53 GMT
#8
the yellow line is R.
Chill
Profile Blog Joined January 2005
Calgary25978 Posts
Last Edited: 2008-02-02 06:04:58
February 02 2008 06:02 GMT
#9
wtf dude how do X and Y relate to anything? It's just like "heres a cartesian coordianate system with arbitrary axis lengths, and and heres an unrelated triangle, solve."

Please explain what the hell is going on in this picture.

Edit: rofl what is Theta two? It's like I have a line segment terminating in another line. But now imagine if that line continued, what would that angle be?

180. Thats the definition of a line. --;;

You really need to put some effort in explaining what the hell youre trying to do. Or draw a proper diagram. This is really frustrating because the actual problem is like some stuff tons of people here could solve if we were given proper background.
Moderator
Raithed
Profile Blog Joined May 2007
China7078 Posts
Last Edited: 2008-02-02 06:57:32
February 02 2008 06:56 GMT
#10
thats the diagram dude lol, its a robot arm. but for the theta2, i think its only to the 90degrees..
Chill
Profile Blog Joined January 2005
Calgary25978 Posts
February 02 2008 07:41 GMT
#11
How do the X and Y relate to anything?

Theres something you aren't explaining properly. For example, you have given us a picture similar to this:
[image loading]


It's not possible to solve without relating X and Y to it somehow.

If it's a robot arm, shouldn't X=Y=R since the arm is constant length? Basically WHAT ARE X AND Y? In your diagram they are just fucking arbitrary lengths that don't relate to a goddamn thing.
Moderator
Chill
Profile Blog Joined January 2005
Calgary25978 Posts
February 02 2008 07:42 GMT
#12
yea ok after reading this thread you clearly have no idea what is going on so ill drop this.
Moderator
mjh
Profile Joined November 2007
United States133 Posts
February 02 2008 08:07 GMT
#13
hahaha
Raithed
Profile Blog Joined May 2007
China7078 Posts
February 02 2008 08:11 GMT
#14
you havent seen this: http://teamliquid.net/blogs/viewblog.php?id=65889

but i wouldnt expect you to understand it. R is the faded line.
Purind
Profile Blog Joined April 2004
Canada3562 Posts
February 02 2008 15:52 GMT
#15
That topic was confusing as hell. The thing is that you haven't formulated the problem correctly. You don't tell us what X and Y are (in either thread) and we were only able to figure it out because of how you formulated your solution.

And is there anything wrong with my solution? I only assumed I knew what the question was because I've taken a robotics course and have done this stuff, so I can semi-guess what the question is asking, but I don't really know myself
Trucy Wright is hot
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