Re: Milling rare earth magnet or other magnets?


"Eddie" <edspeer1(notthis)@earthlink.net> wrote in message
news:xkqmf.1747$nm.345@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
>
> > It might be helpful to provide better guidance if you suggested what you
> > intended to do. Your mind's eye and mine likely don't see things the
> same
> > way, so I may not understand your objective.
> >
> > Harold
>
>
>
> My first project will be taking a magnet shaped like a small brick and
> creating two small shelves on the brick so it will then be shaped sort of
> like a surface plate with the shelf on it or the plate one might create to
> mount a QC tool post in the t-slot of a lathe compound.
> I would also like to reduce the OD diameter of a magnet shaped like a
simple
> cylinder.

I'm of the opinion you can do both by grinding.

> I don't own a surface grinder or a tool post grinder. I do have a high
speed
> (35K RPM?) laminate trimmer that I mount on the Aloris post on my lathe
for
> tapering wood spindles. Even if I put a small grinding wheel on the
laminate
> trimmer I couldn't slow down its speed easily.

I don't think you'd want to, either. Grinding wheels can usually be run @
6,000 SFPM with total safety. You'd use mounted points, which will easily
run at that speed, assuming they're not any larger than 5/8" diameter. You
might even get away with a 3/4" diameter point, but I'd be caustion when
starting it up. Don't stand in line with these wheels while they're
spooling up, nor for the first minute or so. If they'll hold up for that,
they're likely fine. Dress with a diamond and go to work.

You may have a hard time finding silicon carbide wheels, but aluminum oxide
may work. It's not as hard as silicon carbide, which would be the best
choice unless you can find CBN or diamond wheels instead. Harbor Freight
offers some small diamond wheels of sorts, and they're not expensive. I'd
suggest you investigate them.

> If the material was Al or steel I wouldn't have a problem creating these
> most basic of shapes even with my light equipment but as you mentioned,
the
> magnet seems really brittle.

Yeah, which is why diamond would likely be the best choice.

> I haven't tried ANY methods yet. I'm planning ahead.
> Thank You,
> Eddie
>
My pleasure. Hope you have success. Why don't you let us know?

Harold


.

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