RomeroUK Dynamo Parts List Need Help Folks.

[Lakes]

Hi All,
I had another look at what ferrite rods
are offered on Ebay.

The most availabke ferrite rods on Ebay are
the types from AM radios like
8 mm or 10 mm in diameter.

But they are much too long.

Is there any easy method to cut them to a wished length
without destroying them ?

COuld this be done with a glas cutter or a pipe cutter tool
or better using some kind of saw ?

If a saw works, what kind of saw would be best ?

Clanzer uses what looks like a Dremel Saw in this video.
http://www.youtube.com/watch?v=vZoRd8MV5qI

[tysb3]

maybe I'll try to make the coils rods in this way:

http://www.youtube.com/watch?v=O4NBR0cl0b8

http://cgi.ebay.com/5-lb-Black-Iron-Oxide-Fe3O4-Used-Thermite-/280351919842?pt=LH_DefaultDomain_0&hash=item414646cee2

http://cgi.ebay.com/Great-Planes-Pro-Epoxy-Finishing-Resin-9-oz-GPMR6049-/360353787875?pt=LH_DefaultDomain_0&hash=item53e6c26fe3

Peter Lindemann's quote:

This method was developed by the late Bill Muller for his motors. Make a frame or mold of the exact size of magnetite core you wish to cast, and line it with a material that will allow you to get the core out after it sets up. Make sure the end plates are made of .125 inch plastic sheet. Mix your magnetite with a slow curing, high temperature resin. Mix as much magnetite into the resin as possible while it is still malleable. Fill the mold and place the end plates on each end, and then place a strong, NEO magnet on EACH SIDE of the mold. The NEO magnets should be at least as large as the magnetite core you are making, and should face each other in the attraction mode, so that all of the particles of magnetite line up, and TOUCH EACH OTHER as the resin sets. This also aligns the magnetic domains in the iron so they are all parallel in the finished core.

Any other method yields very poor results.

When the resin is set (24 hours), the magnetite disc should be able to magnetize up to at least 2500 Gauss and operate with a very narrow hysteresis curve. It will be a complete "non-conductor" so "eddy-currents" will be very low.

Bill Muller used these cores in his motors as a cheap substitute for Metglas Cores. They have many of the same high-speed switching characteristics, but their magnetic permeability is much lower.

That is it. No more questions. Good luck.

Peter

[Aphasiac]

maybe I'll try to make the coils rods in this way:

http://www.youtube.com/watch?v=O4NBR0cl0b8

Looks like Metglas offers free samples. Might be worth trying it out.

http://www.metglas.com/products/page5_1_2.htm

Aphasiac. 

[tysb3]

Looks like Metglas offers free samples. Might be worth trying it out.

http://www.metglas.com/products/page5_1_2.htm

Aphasiac.

if I understand, they distribute product not in the shape but in the weight. you need to heave tools for shaping the rods

[brotherbear626]

maybe I'll try to make the coils rods in this way:

http://www.youtube.com/watch?v=O4NBR0cl0b8

http://cgi.ebay.com/5-lb-Black-Iron-Oxide-Fe3O4-Used-Thermite-/280351919842?pt=LH_DefaultDomain_0&hash=item414646cee2

http://cgi.ebay.com/Great-Planes-Pro-Epoxy-Finishing-Resin-9-oz-GPMR6049-/360353787875?pt=LH_DefaultDomain_0&hash=item53e6c26fe3

Peter Lindemann's quote:

What would the affect bismuth would have as a core or maybe something to help? you can levitate things with it and magnets....