a different kind of project

[Kermit]

A magneto generator. Actually it is a science project for 5th grade. I did the part creation and he put it all together.

Magnets are ready for mounting but finding a way to keep them apart, adjust their spacing and provide for easily disassembly; all at the same time, is slowing us down at the moment.

I'm going to start with a pole shoe of some sort up next to the rotor. It will be an arc to provide equal spacing around the rotor. Next the magnets will be mounted. I'm going to drill and tap the pole shoes in two places for bolts. Probably 1/4 twenty bolt, and by using stainless or brass the magnets can be dislodged from the shoes far enough to be able to pull them off by hand. Mounting is pretty much figured out as well, but the sticky point is a way to adjust the air gap around the rotor with the magnets in place. The magnets will hold almost 300Kg in a dead lift when put together in a row. The adjustment will have to be of 6061 or stainless or some other non magnetic alloy.

Anyway, thought someone here might find this interesting. The reason for the awkward rotor assembly was to make it 'see-through', and therefore the use of plastic. The other reason was the use of powdered iron filings for the rotor iron. Stamped sheet steel fabrication being out of my reach technically right now.

Kermit

 

[RobWilson]

Looking good Kermit ,very interesting what sort of voltage will you get from it ?
Rob

 

[itowbig]

interesting. this is different. is there going to be a plexy top for see though.

 

[bearcar1]

I see you found another use for cable tray joint splices :big: (those pieces you used for the bearing mounts) I've bolted together a million of those pieces in my years. Cool looking project, It is a far cry from the plywood board with a push button switch, two dry cells and a bell I did for one of my projects 40+ years ago.

BC1
Jim

 

[Kermit]

375 feet of AWG21 magnet wire. 400 turns in the coil. 20 wires wide by 20 layers.

Using a very conservative figure for my magnetic flux density. I should get 50 volts from this generator. IF I could spin it at 3000 RPM. The best I've gotten on this puppy is about 600 RPM which will give me about 17 volts.

Good enough to charge a lead acid battery(car battery)

Kermit

 

[Kermit]

Finished about a week ago, but other things have kept me away from here.

The wifes picture, with ME in it again. Can't trust her to take a pic of the project, oh no! ;D

A 120 volt 40 Watt bulb. Getting about 50-60 volts from the genny.

Kermit

 

[itowbig]

yeeee it works woohoo1 this is good for my kids for when they want to watch tv they can just crank that gen for a while (im sure they will love that)

 

[bearcar1]

Why is the TV stand smoking ??? :shrug: Rof}



"honey, what's that smell? ..........."

"Uh, nothing dear"

BC1
Jim

 

[Kermit]

So glad I could help you feel better...

Now I need help thinking of another project that might make machinists laugh.

Perhaps an analog of the fishermans ruler for the machinist micrometer?

 

[steamer]

Kermit,

Make the body of the mic out of rubber....heheheheheh

;D

Dave

 

[RobWilson]

COOOOOOOOOOOOOOL ;D DID YOUR SON GET A GOOD MARK FOR HIS PROJECT?
Rob

 

[Kermit]

Yes, he got an "A". But I was very dissapointed.

They don't take them to class for any kind of show and tell. ???

We had to get printed 4x6 pictures and he made a small poster with a written report.


Still bristlin' over that,
Kermit

 

[RobWilson]

Great result with the "A", What a bummer not having a show and tell , i thought that was the hole point of the exercise
Regards Rob

 

[rake60]

Nice project Kermit!

Make a bigger one that can be driven by a coal fired steam engine
then call the electric company and tell them to go.....

Well, you know where that is headed.


Rick

 

[Kermit]

The expression says it all! The safety glasses could be a better fit though

Thanks from me and my youngest to everyone,
Kermit

 

[zeeprogrammer]

The expression says it all!

It does. There's no greater joy. Congratulations.