Grim's idea

[Michael]

Tinhead/Rainer;

You experimented with Grim's design before. Did you have any luck with it?

Reg.

Mike

[Tinhead]

Tinhead/Rainer;

You experimented with Grim's design before. Did you have any luck with it?

Yes I did, but with no positive result. One thing to keep in mind is WM2D itself .. if the design relates on impact redistribution you must be aware that WM2D only calculates 'rigid' bodies collisions. I know you can define elasticity, BUT WM2D uses a simplified formula.
Basically if you want to simulate flexible collision you have put springs into the impact area, I still have to do that with Grim's design.

Cheers,
Rainer

[Michael]

>if the design relates on impact redistribution you must be aware that WM2D only calculates 'rigid' bodies

Which is something I thought of last night because Jim if your wheel was running from impact then you really have something, but if it is just from spring play as Jonathan and you now think, then of course work is needed.

Reg.

Michael

[Neo]

Jim remember somewhere here someone posted the Jack O Lantern PM machine it shows a way of turning a rocking motion into a cranking of a Flywheel...

Here is the link http://www.pureenergysystems.com/os/Gravity/Sully/

[Tausen]

What about allowing the center spring attachment move slightly. Maybe in tight circle as the things go around.

Reminds me of a weird dream I had of a toy maker that had some pendulum device that would just sorta vibrate after he started it.

Good luck,

T.

[jim_mich]

What about allowing the center spring attachment move slightly. Maybe in tight circle as the things go around.

I tried hooking the springs to the edges of the small inner wheel and allowing the wheel free to rotate. But the small wheel just did an 1/8 turn dropping the top and bottom weights, stopping the wheel before it had a chance to do anything. Maybe if I leave them hooked to a center point on the small inner wheel but let the wheel float a little?

[Tausen]

Could you use magnets in there somewhere to generate a current from this thing? That way you wouldn't be touching the original concept.

Just a thought.

T.

[grim]

Hi Jim

Have returned after long hiatus.

In answer to your question, the big weights were 1 1/2 lb., the small ones six-oz.

I made them by removing the tops from several soda cans and pouring them with molten lead. After cooling, the soda cans peeled off easily, leaving soda-can sized lead slugs.

The O.D.'s were left rough and wafers slightly thicker than 3/4" were bandsawed from the slugs. These were turned in a lathe to 3/4" thick, and all drilled holes were 1/4".

The disk is at my office, so I will measure it and give you its diameter tomorrow.

Best regards,


grim

[grim]

1/2 inch thick plywood disk, 15 inches diameter. 1/4" center hole.



grim

[ken_behrendt]

Grim...

I gave it a try, but had no success.

As shown in the attachment, my version of your wheel is 3 ft in diameter and the empty wheel mass is 10 lbs. The four larger yellow weights are 2 lbs each and the four smaller gray weights are 0.5 lbs each. The springs had an UNstretched length of 0.547 ft each and all K values were set to 4 lb/ft.

I found that, unless I attached the springs to the centers of the smaller gray weights, the larger yellow weights would be easily flipped over to their left side and then would not want to restore against their inner red stops.


ken

[Techstuf]

Grim, that must've been some special kind of secret 'Besslerian' reduced gravity lead to produce only 1 1/2lbs. at soda can size.




Peace,


TS

[grim]

Yes, a pop-can size slug of lead weighs considerably more than 1 1/2 lbs.

You must have forgotten to cut the slugs into 3/4" thick wafers?

All one is doing is using counterweighted levers and helper springs to lift the weight off the bottom of the wheel, making it topheavy and unstable.
The top weight, swinging free off its inner stop toward the outer stop, gave the topheavy wheel a direction to turn toward while straining the spring in readiness to aid the counterweighted arm to lift the weight to its inner stop when once again at the bottom. With the inertia of the heavy weights driving the system, it had no choice but to return to bottom reset position and reset.

It's not that hard.


Best regards to all,


grim

[rks1878]

Grimster:

IMO your "wheel" is a slug. Sorry.

I'm pouring salt on it now......

[grim]

Everyone is entitled......



Good Luck


grim

[rks1878]

Thought so.

Sounds like confirmation.

Thanks for the luck wish.