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On Mon, 24 Jul 2000 16:04:45 -0400, Serge LAROCQUE wrote...
> 1. You define the lengths of the members
> 2. You provide an input angle for the member on the left
> 3. The angle for the member on the right is calculated
> 4. The angle for the middle member can be calculated next
> 5. Translate and rotate the members
I suppose it may be worth pointing out to any pedants out there that
there are indeed four bars in the animation, one of them just happens to
be invisible and connects the two pivots made from a cylinder and sphere.
The only reason I know this is because I watched an Open University (UK
home study university) program on 4 bar linkages, which is a mildly odd
thing to do, given that I'm a marine biologist...
Oh, and the animation is quite nice, but I'd have liked to see a slightly
bigger range of movement covered.
Bye for now,
Jamie.
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On Wed, 26 Jul 2000 01:25:15 -0400, Serge LAROCQUE wrote...
> > I suppose it may be worth pointing out to any pedants out there that
> > there are indeed four bars in the animation, one of them just happens to
> > be invisible and connects the two pivots made from a cylinder and sphere.
>
> Yes, that's the "fixed" or "ground" link.
>
> I can go one step further and mention that depending on the lengths of the
> bars relative to each other, you can get three types of motion:
>
> 1. crank-crank (both levers go completely around)
> 2. crank-rocker (left lever goes around, other one oscillates to and fro)
> 3. rocker-rocker (both levers oscillate to and fro ;) )
Yep that's what was covered in the programme I saw.
> I could also mention dead points, but I won't :D
Well, I was feeling pedantic, and decided to clear up any possible
confusion.
I don't suppose your system can handle the other four bar linkages
involving rotary->linear movement ie crank-piston or rocker-piston.
Bye for now,
Jamie.
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On Wed, 26 Jul 2000 17:18:43 -0400, Serge LAROCQUE wrote...
> Bigger range of movement, just for you ;)
Ooh Ta! :)
Seriously, I think that that to properly demonstrate a 4 bar linkage, the
input need to go through the full range of its motion.
Bye for now,
Jamie.
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much better :)
now can you get it to replicate the motion of a steam engines connecting
rods?
Rick
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On Wed, 26 Jul 2000 22:36:07 +0100, "Rick [Kitty5]" <ric### [at] kitty5 com>
wrote:
>now can you get it to replicate the motion of a steam engines connecting
>rods?
Kinematically, the solution to those is not defined. They work because
of Watt cheating :)
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG e-mail : pet### [at] tagpovrayorg
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"Serge LAROCQUE" <sgl### [at] hotmailcom%> wrote in message
news:397fa998@news.povray.org...
> With a complete revolution of the crank, first time around for this one ;)
>
show off :)
Rick
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On Wed, 26 Jul 2000 21:44:30 -0400, Serge LAROCQUE wrote...
> > Yep that's what was covered in the programme I saw.
>
> Sheesh and I learned it in university, and all the while I could have just
> watched a TV programme ;)
Well it was a university grade TV programme :) (the Open University in
the UK, for those who may or may not be interested. I'm possibly a tad
strange in that I watch their TV programmes for entertainment...)
> > I don't suppose your system can handle the other four bar linkages
> > involving rotary->linear movement ie crank-piston or rocker-piston.
>
> That's a different mechanism altogether. It is in fact called the crank-slider.
> Do you want an animation of such a thing? That could be arranged.
I'm sure it was covered in the same programme on four bar linkages, but I
may be getting confused, and it may have been included at the end in a
section on 'and these are some other common linkages'
Besides, my interest in engineering is purely in passing, but I like to
know a little bit about all sorts of things.
Bye for now,
Jamie.
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