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cutting ferrite

Discussion in 'Electronic Design' started by Yzordderrex, Jan 13, 2009.

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  1. Yzordderrex

    Yzordderrex Guest

    Does it take a diamond blade to cut ferrite? I have a tile saw at
    home and I am wondering if it would cut ferrite rod into small
    buttons.

    regards,
    Snooky
     
  2. Hey, Snooky:-

    Diamond will work for sure. SiC grinding, maybe.
     
  3. ian field

    ian field Guest

    If your tile saw can cut a groove all the way round it might be able to
    split the cut with thermal shock, try warming the rod and cooling the
    "button" with freezer spray.
     
  4. amdx

    amdx Guest

    Any possibility of using a toroid as your button?
    Mike
     
  5. Joerg

    Joerg Guest

    No, but I've soldered on a shirt button. Then I married and my wife told
    me in no uncertain terms that this ain't the proper method and from then
    on she'd do the sewing.
     
  6. It's done industrially using a diamond saw in the manufacture of custom
    magnets, such as the ones I had made for my "interesting" guitar pickups.

    Clifford Heath.
     
  7. ehsjr

    ehsjr Guest

    Man, you must have *some* solder station! :)

    Ed
     
  8. Greegor

    Greegor Guest

    On the cable TV show How It's Made they have showed
    both how magnets are made and how guitar pickups are
    installed in production environments.

    The magnets are sort of pre-programmed as magnets
    then heated or something and then only at the tail
    end of the processes exposed to a machine
    that I assume generates a massively strong
    electromagnetic field.

    Just out of curiosity, do the super strong
    neodymium magnets actually work good for
    guitar pickup magnetic bias?

    How about weak magnets? Do they work
    just as well as medium strength magnets?

    Do the amps see them as all the same?

    Has anybody ever tried using smooth DC powered
    electromagnetism for the bias magnetism?
    I would think it would make some kinds of trial
    and error with bias magnet strength much easier.

    It might be interesting to make the
    voltage into the bias coils a signal
    which would blend into the output...

    Has this all been done before?

    How about carrying the bias even further and
    turning the pickup into an electromagnet to
    vibrate the guitar string?

    When you said you had "interesting" pickups,
    what exactly did you mean? LOL
     
  9. I had to do exactly that once or twice. The tile saw works, although the cut
    is not exactly very clean. Keep in mind that the magnetic properties of the
    material are affected; there is a significant amount of anisotropy after
    cutting.

    Vladimir Vassilevsky
    DSP and Mixed Signal Consultant
    www.abvolt.com
     
  10. A magnetizer, yes. This is the procedure with ceramic
    magnets, not with AlNiCo though. Hard ferrites are
    used, not the magnetically soft ferrites as used in
    electronics. After the ferrite has been cut to shape,
    it's placed in the magnetizer for a minute or so, while
    the foundation of the building hums. Did I mention that
    a magnetizer uses a lot of power? :)
    Probably, but you need to get the right size and magnetic
    orientation. neodymium magnets are plated because the
    surface is weak, brittle and even reactive I believe,
    so custom manufacture is expensive.
    Pickups don't generally need very strong magnets. If you
    have too strong a field at the string it affects the
    vibration by introducing a node in the vertical direction
    due to the non-linear magnetic drag. Some Stratocaster PUs
    do this on purpose, but most don't.
    The amps see the coil impedance (complex), modified almost
    not at all by the magnetic environment its in. Coils often
    have a kilometer of wire, with significant self-capacitance,
    and a high DC resistance (5-10Kohm) leading to a broad resonant
    peak that defines the sound of that pickup.
    I believe it was tried in the 50's (patents would indicate so
    anyhow) but now we have better permanent magnets and there's
    no need.
    That sort of modulation is easier to do electronically now.
    probably, yes. All kinds of wacky things have been tried,
    and many have been patented. Do a search.
    It's been done I believe.
    It's a "Sidewinder" layout such as was patented in 1974 by Bill
    Lawrence while he was working for Gibson, but with a difference.
    Mine are much more compact, and work better. I use a central
    ceramic blade magnet with coils mounted either side, where the
    axis of each coil passes through the face of the magnet. This
    gives a compact humbucking action with the single-point response
    of a single-coil pickup. It also gives higher output, as the
    string can induce larger changes in magnetic flux than where the
    magnet runs through the coil axis.

    Clifford Heath.
     
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