ferrite machining?
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From: BlindBaby on 12 Jun 2010 13:18 On Sat, 12 Jun 2010 09:18:29 -0700 (PDT), Bill Sloman <bill.sloman(a)ieee.org> wrote: >Regular ferrites aren't resin-bonded. You can get resin-bonded soft >and hard ferrites and, but the resin dilutes the magentic material and >the magnetic performance is consequently poor. Ferrite are specifically formulated to keep the magnetic particles APART from each other, idiot.
From: BlindBaby on 12 Jun 2010 13:19 On Sat, 12 Jun 2010 09:18:29 -0700 (PDT), Bill Sloman <bill.sloman(a)ieee.org> wrote: >Sintering depends on the same process of solid state diffusion that >makes ceramics hard, but managanese-zinc and nickel-zinc ferrites >aren't ceramics -inorganic non-metallic solids - and shouldn't be >expected to have similar properties, or to react to heat treatment in >the same way. They don't, idiot. That is why they are described as being "ceramic like".
From: BlindBaby on 12 Jun 2010 13:19 On Sat, 12 Jun 2010 09:20:37 -0700 (PDT), MooseFET <kensmith(a)rahul.net> wrote: >On Jun 12, 11:48 am, BlindBaby ><BlindMelonChit...(a)wellnevergetthatonethealbumcover.org> wrote: >> On Fri, 11 Jun 2010 20:24:34 -0700 (PDT), MooseFET <kensm...(a)rahul.net> >> wrote: >> >> >On Jun 12, 1:33 am, Bill Sloman <bill.slo...(a)ieee.org> wrote: >> >[...] >> >> Wrong. Permeability drops with rising temperature, and leakage flux >> >> rises. Ferrite cores don't have to get very hot before they become >> >> magnetically insignificant. Read the relevant data sheets for the >> >> material used to make your core on the manufactuere's web site. >> >> >This has nothing to do with the reason to watch the temperature rise. >> >It is just plain a mechanical issue. The material is brittle and a >> >bad >> >conductor of heat. >> >> And grinding it doesn't hurt it at all. It got heated when it got >> made. It is a sintered, stamped, baked manufacturing process. > >All sintered things are brittle. Watch the temperature. You're an idiot. Your temperature must not have been watched well enough.
From: John Fields on 12 Jun 2010 13:19 On Sat, 12 Jun 2010 09:03:31 -0700 (PDT), Bill Sloman <bill.sloman(a)ieee.org> wrote: >On Jun 12, 5:47�pm, John Fields <jfie...(a)austininstruments.com> wrote: >> On Sat, 12 Jun 2010 08:11:03 -0700, BlindBaby >> >> <BlindMelonChit...(a)wellnevergetthatonethealbumcover.org> wrote: >> >On Sat, 12 Jun 2010 09:35:16 -0500, John Fields >> ><jfie...(a)austininstruments.com> wrote: >> >> >>That is, since the subject of the thread is "ferrite machining?", one >> >>with a modicum of sense would infer that the heat referred to was >> >>generated purely by mechanical means and that the Curie temperature of >> >>the material, at that point was immaterial. >> >> > �Jeez, I wish I could expound facts the way you do. >> >> --- >> Thank you, that's very kind. :-) > >But, granting that the admiration comes fron BlindBaby, not worth >much. --- What a nasty piece of work you are! Just because you don't get any doesn't mean it's not worthwhile.
From: BlindBaby on 12 Jun 2010 13:21
On Sat, 12 Jun 2010 09:29:32 -0700 (PDT), MooseFET <kensmith(a)rahul.net> wrote: >On Jun 12, 8:30 pm, Grant <o...(a)grrr.id.au> wrote: >> On Fri, 11 Jun 2010 20:20:54 -0700 (PDT), MooseFET <kensm...(a)rahul.net> wrote: >[...] >> Anyway, 150 grit diamond tool rips into the stuff, black dust everywhere, >> easy to fracture pieces off, very harsh if one applies too much pressure. > >The problem is mostly the local temperature rise. If you are careful, >you >can cut an O-ring groove into a rod core to seal the place where it >goes >through a wall. Fine work can be done but when making any sort of a >groove a lot of care is needed. > Your brain is on overkill, and you can't even get that right. |