Muller Dynamo

[bolt]

New question on coil core materials, I need assistance, advice, clarification on before I do a LOT of work making mu-metal cores.

I have 10+ kg of mu-metal plates off of old hard-drive magnets I've collected over the past 2 years. I want to melt and cast 18 to 20 mm diameter rods and use this as the core materials for my next coils (will cut coil ends and have coils approx. 25mm in length). What can I expect (coil characteristics) using this material vs. the 18 mm dia. hollow ferrite tubes I am using now?

Would you use mu-metal cores with wire wrapped directly to them IF you had them? Looking for yor advice and opinions.

The old shop tchr [39 yrs] trying new things. [Today was LAST DAY for my students so now I can do what I want       for the summer!]

Mu-metal has some amazing properties but before you go melting it you best look into the process it was manufactured as some of these alloys undergo extremely detailed heat treatments to give them the unique properties. So before you go melting it into a big BLOB could easy kill it and produce a magnetic permeability worse than grandmas old iron kitchen sink!

[bourne]

Mu-metal has some amazing properties but before you go melting it you best look into the process it was manufactured as some of these alloys undergo extremely detailed heat treatments to give them the unique properties. So before you go melting it into a big BLOB could easy kill it and produce a magnetic permeability worse than grandmas old iron kitchen sink!

Interestingly the annealing aligns the magnetic domains according to the wiki page http://en.wikipedia.org/wiki/Mu-metal

Same as Muller with setting his polycrystalline resin cores in a strong magnetic field. Was that his way of increasing the permeability of his cores?

[Magluvin]

Interestingly the annealing aligns the magnetic domains according to the wiki page http://en.wikipedia.org/wiki/Mu-metal

Same as Muller with setting his polycrystalline resin cores in a strong magnetic field. Was that his way of increasing the permeability of his cores?

Hmm  if this is true, then maybe Muller had magnetized cores. And the bias magnets simulate that.  Maybe. ;]

Mags

[Scorch]

Hey everybody. Finally decided to acquire a real (but cheap) variable DC power supply for my lab.
Thought you might be interested to know about an Asian built 30vdc, 5amp, power supply with fine tuning, LED display, and test leads for only $80.

It's an Atten Brand model APS3005S currently available through Amazon at: http://amzn.com/B0050FBSRY

It brags of low ripple and noise and the China manufacture's page says it has a "Strong Wind" (Forced Air) cooling system.
And I think LED displays look cool compared to common LCD displays.

Not a bad deal for $79.99 and free shipping.
Most other 30v, 5a, supplies are $100 or more.

}:>

[d@rkenergy]

@ d@arkenergy,

Nice looking rotor.   Where did you find your delrin?   Did you have to cut your own circle/disc?

Bill

I'm having turkey. in industry's shops easily. long as they are made ​​of rods. Any size from 10mm-500mm's.
  I bought a 15mm thick, 200mm diameter.
they are cutting as you want.

lathe machine, then had a thickness of 10mm.

http://www.google.com.tr/search?tbm=isch&hl=tr&source=hp&biw=1016&bih=569&q=delrin&btnG=G%C3%B6rsellerde+Ara&gbv=2&oq=delrin&aq=f&aqi=&aql=&gs_sm=s&gs_upl=0l0l0l0l0l0l0l0l0l0l0ll0