Anuncios

The Autodesk Community Forums has a new look. Read more about what's changed on the Community Announcements board.

Autodesk trigonometry problem

Anonymous

Autodesk trigonometry problem

Anonymous
No aplicable

I have a problem I am trying to solve

 

-Find the attached .dwg File and open it

 

-ALL angles given must NOT Change

 

-ALL dimensions given must also NOT Change including the 2 pink lines

 

-The 3 White lines MUST be of exact equal length without changing any angles given in this drawing.

 

Anyone care to help?

Maths.png

 

0 Me gusta
Responder
434 Vistas
8 Respuestas
Respuestas (8)

Mark_C_123
Advocate
Advocate

Sure, its called text overide :cara_con_la_lengua_fuera: easy!

0 Me gusta

Anonymous
No aplicable

Hi Mark

Can someone post a video on how this is done with this drawing?

 

Thank you

Andrew

0 Me gusta

Mark_C_123
Advocate
Advocate

That was a joke. text overide just allows you to change your dimension text. Not a real solution to your question sorry.

0 Me gusta

Kent1Cooper
Consultant
Consultant

Since the bends between white and pink Lines are all the same [1.5 degrees], consider that the next pink Lines off the far ends of the white ones in the same sequence would be at the same kind of bend.  Copy each pink Line from its inboard end to the outboard end of the outer white Lines.  Rotate them each 3 degrees in the appropriate direction, so that their bend from the adjacent end white Lines is the same 1.5 degrees in the same direction as the sequence suggests.

 

These new outer pink Lines can now define the center of the virtual circle that will pass through centers of all pink Lines when correctly adjusted.  Draw XLINEs through their midpoints and perpendicular to them.  [You can OFFSET them by some significant amount, e.g. 200 units, and define the Xlines through the midpoints of the original and the Offset copy in each case.  You can then Erase the offset copies.]  Draw a CIRCLE whose center is at the INTersection of those Xlines, and whose radius is defined by the midpoint of either of the new outer pink Lines.

 

TRIM that Circle using the Xlines as Trim boundaries, so that what remains is just the Arc that sort of overlays the linework.  Use DIVIDE to place POINTs at the third-points along that Arc.  [Set PDMODE to something that makes the Points visible.]  You can now Erase the Arc.

 

In a STRETCH command, select with a Crossing window around an entire inner pink Line and its Aligned Dimension and including the ends of the adjacent two white Lines, and Stretch that from a base point at the midpoint of the pink Line to a destination at the nearby Point [with NODE Osnap].  Do the same with the other, which will be a Stretch by the same distance in the opposite-ish direction.

 

DONE!  [The white Lines turn out to be each 234.3399 units long.]  Erase the Xlines and Points and outboard pink Lines.

Kent Cooper, AIA

Anonymous
No aplicable

Thanks Kent

Can you post the your file up here so I can see what you didi?

 

Andrew

0 Me gusta

Kent1Cooper
Consultant
Consultant

I would say I'm not attaching anything because I'm not going to do your homework for you, but in fact for some reason the website [or perhaps my computer] isn't letting me attach anything right now.  I may try again later, but not with the finished product -- it will have the added outboard pink Lines, Xlines, Arc, and Points, and leave the finishing up with Stretching to you, so you can see where it's coming from relative to where it ends up.  You can probably do it yourself by carefully following the instructions before I'll get to trying again [bedtime here].

Kent Cooper, AIA

john.vellek
Alumni
Alumni

Nice solution Kent :cara_con_una_leve_sonrisa:


John Vellek


Join the Autodesk Customer Council - Interact with developers, provide feedback on current and future software releases, and beta test the latest software!

Autodesk Knowledge Network | Autodesk Account | Product Feedback
0 Me gusta

leeminardi
Mentor
Mentor

Try using AutoCAD's parametric features.  Add parametric dimensions for all the dimensions specified in the drawing. Add constraints for the horizontal reference line and coincident constraints at the ends of all line.  Add a parametric dimension for one of the straight white lines then reference this dimension for the second white line.  The third white line will be a reference dimension.  Now via trial and error change the dimension of the first white line value until it is equal to the third dimension.  It took me 6 iterations to get an answer good to 5 significant figures.

 

trigproblem.JPG

 

lee.minardi