TD replications

[dieter]

Any news on this one?


Yesterday I found an antique sewing machine on a yard, "Singer 1", no electrics, beautiful btw., with a foot pedal driving a flywheel, which would be perfect for something like this.

[gotoluc]

Even though the design appears to have a gain it's a very small one because of the magnet size.
I think we should consider this first design as a concept verification.
I also think OU devices need to be large at first so not to overlook things.
With this said I'm thinking the output needs to travel more distance and have much more pull or push force.
To do this it's going to need magnets that have more surface area.

I've ordered 12 of these for the next experiment: http://www.ebay.com/itm/322408983857

So the version 2 test device will use these 2" x 6" magnets. They be turned by a low rpm DC motor in order to calculate input Watts.
There should be a formula to convert the back and forth output into Watts.
If you want to help please find the formula to do so.

Regards

Luc

[dieter]

I think, first you should add springs to the 11mm push/pull to compensate / nullify the losses you will otherwise get due to accelleration of mass. Springs of the right strength, so it becomes a pendulum, synched with the wheels rotation.


Mass in motion doesn't require energy, only to brake, accellerate or redirect it will require energy, in outer space without gravity and air, of course.
So, this goes over my head and personally I would rather try to build that cranking mechanism than to find and understand a formula for the conversion of this output into eg. joules. And I wouldn't trust the formula anyway, esp. when found on wikipedia


About size I found out, you may also just downscale friction, instead of upscaling the model. Bicycle wheels have pretty good friction and stability features already, in relation to their size.


For tiny models with eg. 1 foot diam. rotor I prefer Needle bearings, actually hardened steel nails, so the contact area is never nore than like 1/50mm2.


Anyhow, with stronger magnets you may very well see an even more obvious net gain.

[gotoluc]

Humm, pendulum... I was also thinking of a pendulum instead of the wheel since only 2 magnets are needed to make the output go back and forth.

It should also be an easier mechanism to redirect the output back to a pendulum.

Luc

[Floor]

@gotoluc

The difficulty with a pendulum is the same magnet orientation
passes over again on each  back swing.
....................................
When using big ceramic magnets, you might still be able to use
a bicycle rim if you support it with 4 rolling bearings / wheels 
2 on each side, near to where it passes over the stationary magnet.
.......................................
If you have any thing specific you would like to run by  me
fell free to pm me.
........................................
Your latest device kicks a___!

                regards
                   floor