ferrite machining?
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From: Yzordderrex on 11 Jun 2010 08:42 Does anyone know of ferrrite can be turned on a lathe? I have a short 1" long by 1" dia. rod ( i know, i know, a personal problem) and I would like to have a grove machined into it to accept a few turns of wire. there will then be a bobbin slipped over that with the secondary on it. I suppose this might be done with some type of grinder as well. Just curious to know what machining options are available for ferrite. regards, Bob
From: MooseFET on 11 Jun 2010 09:41 On Jun 11, 8:42 pm, Yzordderrex <powersupply...(a)netzero.net> wrote: > Does anyone know of ferrrite can be turned on a lathe? > > I have a short 1" long by 1" dia. rod ( i know, i know, a personal > problem) and I would like to have a grove machined into it to accept a > few turns of wire. there will then be a bobbin slipped over that with > the secondary on it. > > I suppose this might be done with some type of grinder as well. > > Just curious to know what machining options are available for ferrite. Grinding is the way to go. If you want to cut something that you would normally do with a lathe in metal, consider a tool post mounted grinder. Watch the temperature rise.
From: John Larkin on 11 Jun 2010 11:11 On Fri, 11 Jun 2010 06:41:57 -0700 (PDT), MooseFET <kensmith(a)rahul.net> wrote: >On Jun 11, 8:42 pm, Yzordderrex <powersupply...(a)netzero.net> wrote: >> Does anyone know of ferrrite can be turned on a lathe? >> >> I have a short 1" long by 1" dia. rod ( i know, i know, a personal >> problem) and I would like to have a grove machined into it to accept a >> few turns of wire. there will then be a bobbin slipped over that with >> the secondary on it. >> >> I suppose this might be done with some type of grinder as well. >> >> Just curious to know what machining options are available for ferrite. > >Grinding is the way to go. If you want to cut something that >you would normally do with a lathe in metal, consider a tool >post mounted grinder. Watch the temperature rise. Maybe a dremel with a diamond wheel? John
From: BlindBaby on 11 Jun 2010 12:07 On Fri, 11 Jun 2010 08:11:04 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Fri, 11 Jun 2010 06:41:57 -0700 (PDT), MooseFET ><kensmith(a)rahul.net> wrote: > >>On Jun 11, 8:42 pm, Yzordderrex <powersupply...(a)netzero.net> wrote: >>> Does anyone know of ferrrite can be turned on a lathe? >>> >>> I have a short 1" long by 1" dia. rod ( i know, i know, a personal >>> problem) and I would like to have a grove machined into it to accept a >>> few turns of wire. there will then be a bobbin slipped over that with >>> the secondary on it. >>> >>> I suppose this might be done with some type of grinder as well. >>> >>> Just curious to know what machining options are available for ferrite. >> >>Grinding is the way to go. If you want to cut something that >>you would normally do with a lathe in metal, consider a tool >>post mounted grinder. Watch the temperature rise. > >Maybe a dremel with a diamond wheel? > >John After the grooves get ground (any cutting attempt will result in fracture), you need to cover the rod with transformer tape to insulate it from your primary wire. If you make an open ended core transformer, it will be pretty leaky unless you use a closed loop core arrangement. You would probably be better off with a pot core. I would use a dremel tool and grinding or cutting (abrasive cutting) disc attached. If you are making a large groove for a single layer of larger wire the grooves will allow the wire profile to sit a bit lower., If you are using fairly small primary wire, you do not need the grooves at all. Temperature rise? They are not magnets. There are no properties to lose via introduction of heat.
From: John Larkin on 11 Jun 2010 12:20
On Fri, 11 Jun 2010 09:07:01 -0700, BlindBaby <BlindMelonChitlin(a)wellnevergetthatonethealbumcover.org> wrote: >On Fri, 11 Jun 2010 08:11:04 -0700, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Fri, 11 Jun 2010 06:41:57 -0700 (PDT), MooseFET >><kensmith(a)rahul.net> wrote: >> >>>On Jun 11, 8:42 pm, Yzordderrex <powersupply...(a)netzero.net> wrote: >>>> Does anyone know of ferrrite can be turned on a lathe? >>>> >>>> I have a short 1" long by 1" dia. rod ( i know, i know, a personal >>>> problem) and I would like to have a grove machined into it to accept a >>>> few turns of wire. there will then be a bobbin slipped over that with >>>> the secondary on it. >>>> >>>> I suppose this might be done with some type of grinder as well. >>>> >>>> Just curious to know what machining options are available for ferrite. >>> >>>Grinding is the way to go. If you want to cut something that >>>you would normally do with a lathe in metal, consider a tool >>>post mounted grinder. Watch the temperature rise. >> >>Maybe a dremel with a diamond wheel? >> >>John > > > After the grooves get ground (any cutting attempt will result in >fracture), you need to cover the rod with transformer tape to insulate it >from your primary wire. > > If you make an open ended core transformer, it will be pretty leaky >unless you use a closed loop core arrangement. > > You would probably be better off with a pot core. > > I would use a dremel tool and grinding or cutting (abrasive cutting) >disc attached. > > If you are making a large groove for a single layer of larger wire the >grooves will allow the wire profile to sit a bit lower., > > If you are using fairly small primary wire, you do not need the grooves >at all. > > Temperature rise? They are not magnets. There are no properties to >lose via introduction of heat. Here's a tiny pickup coil we wound in a slot that we turned into a delrin rod. ftp://jjlarkin.lmi.net/BrassThing.jpg This was snooping eddy current fields inside a superconductive magnet. The n*A is tiny, so we got nanovolt signals. And we had to integrate the voltage to get field intensity. John |