Solving Mechanism Geometry Problem - A to B Rotation Degrees

AI Thread Summary
The discussion focuses on solving a geometry problem related to a mechanism similar to a slider crank, where a beam rotates around a fixed point. The user seeks to determine the degrees of rotation for a beam fixed at point A in response to the movement of another beam fixed at point B, which is currently at a 40-degree angle from vertical. A suggested method involves drawing arcs to scale to visualize the motion and intersections of the rods involved. However, the user expresses a preference for a mathematical solution rather than a graphical one. The conversation highlights the challenge of deriving a general solution for the rotation degrees in this mechanism.
Kalus
Messages
36
Reaction score
0
Ok, I have a problem similar to a slider crank but not quite.

http://imageshack.us/photo/my-images/851/sw1b.png/

Fixed points are A and B, all others are free to pivot. The beam labeled 20 is rotating around, at this snapshot 40 degrees from vertical. How can I find how many degrees back and forth the beam that is fixed at A turns in response? I'd quite like to find a general solution

I really can't figure out the geometry for this one :blushing:
 
Engineering news on Phys.org
this can be done with some simple construction..DRAW EVERY THING TO SCALE
Draw an arc showing the motion of the rod fixed to B.

Then divide that arc into maybe 5 pts.Measure the length the 150 rod.

From each of those 5 pts, draw an arc of radius 150(the 150 rod length).This shows the various positions of the 150 rod during the motion of the B rod.

Then from A draw an arc of radius 40(the 40 rod length) to intersect.Join the points of intersection between the various points(between the 150 rod and the 40 rod) with a curve.

I hope this is clear.
 
Thank you for your reply. It is clear, however I was hoping for a mathmatical solution rather than graphical.
 
Here's a video by “driving 4 answers” who seems to me to be well versed on the details of Internal Combustion engines. The video does cover something that's a bit shrouded in 'conspiracy theory', and he touches on that, but of course for phys.org, I'm only interested in the actual science involved. He analyzes the claim of achieving 100 mpg with a 427 cubic inch V8 1970 Ford Galaxy in 1977. Only the fuel supply system was modified. I was surprised that he feels the claim could have been...
TL;DR Summary: Heard in the news about using sonar to locate the sub Hello : After the sinking of the ship near the Greek shores , carrying of alot of people , there was another accident that include 5 tourists and a submarine visiting the titanic , which went missing Some technical notes captured my attention, that there us few sonar devices are hearing sounds repeated every 30 seconds , but they are not able to locate the source Is it possible that the sound waves are reflecting from...
Back
Top