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Author Topic: Need help with wm2d on a potential working wheel.  (Read 6046 times)

broli

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Need help with wm2d on a potential working wheel.
« on: June 28, 2008, 11:16:12 AM »
So when I thought I finally saw the light at the end of the tunnel blabla. I quickly setup the wheel in wm2d and what do I notice...wm2d can't handle it.

(http://broli.dommel.be/gearWheel.PNG)

http://broli.dommel.be/gearWheel.wm2d

The main idea started a little different. What I wanted to solve was "how do I make one weight push on the other so it's on one side further from the center and on the other side closer". My main idea concerned magnets. But then I realized I didn't need any magnets. The basic question was then "how do I keep a fulcrum pretty much horizontal at all time while the wheel is spinning around"

(http://broli.dommel.be/gearWheel1.PNG)

Then as you see the idea morphed in separate wheels with a weight on one side attached to the bigger wheel. I thought this would be the most stable idea. In order to keep the weights pointing to the left I attached a gear constraint from the big wheel to these smaller ones with a 1:1 ratio. So in theory the wheel will always be in imbalance and the the smaller wheels will always rotate along, of course for the viewer the wheels stay still but that's because you're not looking it from the wheel's reference frame.

But as I pointed out earlier wm2d doesn't handle it correct. The smaller wheels just locked up. So besides sharing the idea I'm also asking for help.

loop888

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Re: Need help with wm2d on a potential working wheel.
« Reply #1 on: June 28, 2008, 02:10:59 PM »
the force use to keep the small wheels pointing the weights to the right is exactly the same one that the imbalanced big wheel produces, so, 0.

forget it :P

broli

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Re: Need help with wm2d on a potential working wheel.
« Reply #2 on: June 28, 2008, 02:21:33 PM »
the force use to keep the small wheels pointing the weights to the right is exactly the same one that the imbalanced big wheel produces, so, 0.

forget it :P

Yes but this isn't helpful now is it. Technically even with one smaller wheel this should work/not work. But wm2d does neither show your case or mine. and that's the kind of help I want.

loop888

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Re: Need help with wm2d on a potential working wheel.
« Reply #3 on: June 28, 2008, 05:43:53 PM »
Quote
Yes but this isn't helpful now is it.

well, it is in the way im trying to prevent you from waste more time in vain :P

broli

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Re: Need help with wm2d on a potential working wheel.
« Reply #4 on: June 28, 2008, 05:56:58 PM »
well, it is in the way im trying to prevent you from waste more time in vain :P

God I wish I could hit people with a hammer on their head online.

loop888

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Re: Need help with wm2d on a potential working wheel.
« Reply #5 on: June 28, 2008, 06:12:51 PM »
haha!  ::)

even that wouldnt make that concept work  :P

rlortie

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Re: Need help with wm2d on a potential working wheel.
« Reply #6 on: June 30, 2008, 05:02:11 AM »
Broli,

The answer you seek is simple, but before I explain I must agree with Loop888, your idea will not work. You have four symmetrical pinned wheels with weights all maintaining the same position. Looks good but in fact the weight is all transfered to the symmetrical axles/pins your small disks are spinning on.  The balance of the main wheel could care less as to what direction the weights are pointing.

Now if you wish to check this out for yourself simply hang a larger weight on the bottom of your weight disks, no gears  or mechanical connections required. Make sure that all four are balanced. As the wheel turns they always remain at the bottom, the weights you believe will provide you with OB will always point to the right.

If you realize this fact but still want help with WM2D, sorry I am not your man. I do not use it nor trust it. And yes I am biased as I am to dumb to learn how to use it. My version of WM2D is "Wood, Metal & 2 Days"

Ralph     

broli

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Re: Need help with wm2d on a potential working wheel.
« Reply #7 on: July 01, 2008, 06:28:03 PM »
Instead of starting a new thread I'll just continue in this one. Same problem different concept  ;D. Since I believe more in illustrative examples here follow some pics of the concept and a wm2d model.

(http://broli.dommel.be/superwheel1.PNG)

(http://broli.dommel.be/superwheel2.PNG)

http://broli.dommel.be/superwheel.wm2d

For the people that have wm2d you'll two equal forces acting on the joint all the time. this is normal. The point is that the force on the joint while at the right side (need to zoom out quite a bit to see this) is substantially bigger than on the left side. Yet the wheel doesn't seem to accept this and just spins back.

I did not fully trust wm2d but atm it's the only method I have of materializing my ideas. Or I overlooked something or wm2d can't break the law of conservation of energy.

loop888

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Re: Need help with wm2d on a potential working wheel.
« Reply #8 on: July 01, 2008, 09:27:42 PM »
what?

broli

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Re: Need help with wm2d on a potential working wheel.
« Reply #9 on: July 01, 2008, 09:37:47 PM »
Haha indeed "what". I think this is the wheel. I've went through the house to try and build it but I found nothing bu junk. I believe wm2d can't handle this. Here's proof...

(http://broli.dommel.be/superwheel3.PNG)

The wheel stops there and starts to turn ANTI CLOCKWISE. Yes that's correct. this should be physically wrong. You have a frigging force that's 10 times bigger than the other side. Yet it's turning the wrong way. Not to mention wm2d throws errors every time I run it. I believe this is a truely working wheel. Can people please help me with a build. I will explain everything that is needed.

Edit:

Here's some more madness that show the torque of the wheel going from 12 o'clock till 11 o'clock clockwise.

(http://broli.dommel.be/superwheel4.PNG)

As you can see the it has a lot of torque on one side and pretty much nothing on the other. YET THE SIMULATION DOESN'T ACKNOWLEDGE THIS.  What's also fascinating are the huge spikes that reach up in the millions as if it wasn't to not disobey the conservation law :p.
« Last Edit: July 01, 2008, 10:16:48 PM by broli »