Mike D wrote:
> On Jul 27, 10:28am, jim <j...@[EMAIL PROTECTED]
> wrote:
>> I need some help in locating ceramic disc magnets that measure 120mm in
>> diameter with no hole in the center. The thickness can be as much as 13
mm
>> 25.4mm.
>>
>> The strrength is not as im****tant as the dimensions and that it be a
solid
>> disc (no hole in center).
>>
>> I have found neo magnets that are up to 8" in diameter, but their
strength
>> will actually make it more difficult to perform the initial experiment.
>>
>> If anyone knows where I may purchase ceramic desci magnets that are at
least
>> 120mm in diameter and up to 25.4mm in thickness, with no holes in them,
>> please let me know.
>>
>> Thank you for your help.
>>
>> (I have Googled, Ask'd, Yahoo'd, etc. - all to no avail. The magnets
that I
>> have found generally top out at 76mm in diameter. If I have missed
>> something in these searches, I would appreciate someone pointing it
out.)
>>
>> jim
>
> Most large diameter ceramic magnets were designed/tooled for
> loudspeakers and holding cup assemblies. Both of those involve large
> quantities and require a hole, so they drive the market.
>
> One option is to use a magnet fabricator to grind a disc shape out of
> a solid rectangular block. There are standard 1" x 4" x 6" magnet
> blocks (oriented thru the 1" direction). It won't be cheap because
> it's a fair amount of labor to do that.
>
> The other alternative is to weaken the Neodymium magnets since you
> moderate heat. You'll have to experiment to find the right
> temperature. If you get them too hot and demagnetize them too much,
> you'll have to remag to restore them.
>
> Good luck.
>
> Mike
Thanks Mike.
I think I am going to retool my experiment to use a small neo magnet (3"
in diameter) for testing.
I had hoped to use something larger simply because working with larger
objects is easier than trying to machine all of the smaller parts that I
will need.
But, you work with what you have handy I guess.
jim
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