ferrite machining?
in [Design]
|
Prev: Heat effect on FR4?
Next: More PIC fun
From: Archimedes' Lever on 12 Jun 2010 21:14 On Sun, 13 Jun 2010 10:51:34 +1000, Grant <omg(a)grrr.id.au> wrote: >Yes, I discovered that last night, localised heating trying to get a >narrow cut will easily start a fracture, there's no great pressure or >vibration evident to cause the fracture, it's the localised heat. >Obvious, when one works with the material. Need to keep the tool >moving to distribute the heat loading. If you guys are overheating ferrites, I'd say that your technique suffers from more then tool speed issues.
From: Archimedes' Lever on 12 Jun 2010 21:16 On Sun, 13 Jun 2010 10:51:34 +1000, Grant <omg(a)grrr.id.au> wrote: > same story, localised >heat will fracture ferrite material. Even fast rise in an oven will do it, so even full body heat will do it, if the rise rate is too high. In fact, that is where you have to most watch out for it. Reflow and wave pre-heat profiles. This is also why a lot of transformers and such which are ferrite based get attached by hand post automatic process. But dremeling is not going to do it unless you are just plain dumb about it.
From: Archimedes' Lever on 12 Jun 2010 21:22 On Sun, 13 Jun 2010 11:05:06 +1000, Grant <omg(a)grrr.id.au> wrote: >The 150 grit diamond tool tips in the cheapy abrasive sets seem too >harsh for ferrite, they jar and shatter, but diamond does cut the >stuff quite well. So I imagine finer grit diamond tools would be >good to try. > >The miniature thin cutting off wheels are much slower cutting ferrite, >but very little vibration if you properly mount and dress them before >use. A nice, fine set of jeweler's file also cut meat away pretty well. You just have to watch that you are not too aggressive with the stroke speed and pressure. It is, in fact, a very nice way to do some tasks one might find a need for in ferrites. I used a flat file to shave pot core faces pretty often, since the mini pot cores fit onto the whole file flat. Or I would use the file as the base/face for my abrasive paper or cloth.
From: Bill Sloman on 13 Jun 2010 03:51 On Jun 13, 2:16 am, BlindBaby <BlindMelonChit...(a)wellnevergetthatonethealbumcover.org> wrote: > On Sat, 12 Jun 2010 16:30:38 -0700 (PDT),Bill Sloman > > > > <bill.slo...(a)ieee.org> wrote: > >On Jun 12, 7:19 pm, BlindBaby > ><BlindMelonChit...(a)wellnevergetthatonethealbumcover.org> wrote: > >> On Sat, 12 Jun 2010 09:18:29 -0700 (PDT),Bill Sloman > > >> <bill.slo...(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". > > >But not enough like ceramics for the comparison to be useful? So why > >did you bring ceramics into the discussion in the first place? > > I didn't. Someone else did, and they called them ceramic. I corrected > him, and then I referenced that here. IF you had enough brains to > actually have read the entire thread, you might have caught that. > > But I fear that you don't catch much. There's not a lot in this thread to appreciate. > Shame, that... smallpox or the like comes to mind. In so far as small-pox doesn't exist - as an infectious disease - any more, the fact that it comes to your mind is illustrative of your feeble grasp of reality. http://en.wikipedia.org/wiki/Smallpox So far, it is the only infectious disease of humans to have been eradicated. Polio is next on the list, but we're not quite there yet. -- Bill Sloman, Nijmegen
From: BlindBaby on 13 Jun 2010 04:28
On Sun, 13 Jun 2010 00:51:50 -0700 (PDT), Bill Sloman <bill.sloman(a)ieee.org> wrote: >In so far as small-pox doesn't exist - as an infectious disease - any >more, the fact that it comes to your mind is illustrative of your >feeble grasp of reality. Actually, due to terrorist strains, it may make a comeback, and I know far more about it than you do as I never received a vaccination, and I was born in 1960. Had I gotten one, I would have contracted the disease (a deadly version of cowpox). My brother did not get one either as he would have given it to me. I had a condition at the time known as spots. So I knew more about the disease at age five than you do now. |