Lucas K2F magneto coil rewind
in [Classic Motorcycles]
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From: N_Cook on 24 Apr 2008 17:07 hr(bob) hofmann(a)att.net <hrhofmann(a)att.net> wrote in message news:51acc407-b184-4965-92e6-33117a583e08(a)59g2000hsb.googlegroups.com... On Apr 24, 5:39 am, "N_Cook" <dive...(a)tcp.co.uk> wrote: > A pensioner has asked me about possiblity of rewinding some of these magneto > coils.http://home.graffiti.net/diverse:graffiti.net/K2F.jpg > laying on cm/mm graph paper. > Orangey section is the laquered coil. > C area is the contact patch (supplying 2 HT leads in turn) moulded into the > surrounding paxolin? insulation, continued out to the boss marked P, but > otherwise looking like the tarnished brass sections in colour , marked B. > The curve above the C is the shape of one end of this contact section, not a > trick of the light. > A is aluminium housing for the contact breaker > First comment is he has 5 of these , all not working at all or properly, so > probably not good design anyway, as none were abused in use. > He has one good magneto , he moves around 3 bikes. He can get some or all > nonworkers commercially reconditioned , at a price each. But of course he > would like all 5 rewound and he knows, like me , that having researched and > set-up for one then the following 4 rewinds are much easier. I use a > coil-winder machine but little experience of these sorts of coils. > No electrical data found on the net for these. > As received by me, the secondary measured 22K ohm, now reads 6.3K , at this > stage, presumably shorted turns rather than a break for this one. > He has some sort of technical data for these , when he can find it, but > first thing is how to (after desolding) slide the laquered-in coil out of > the central section between the 2 steel pole pieces marked S, and because of > the boss marked P that holds the HT wire lead out, coil would have to be > removed from the other open section, underneath in pic. Anyone know the > number of turns, wire gauge to save having to count off ? and details of > interlayer insulation (if any). How is the HT coil output removed from the > boss P or whereabouts is the join to a feedthrough under the output laquer? > > -- > Diverse Devices, Southampton, England > electronic hints and repair briefs , schematics/manuals list onhttp://home.graffiti.net/diverse:graffiti.net/ I hope you are either doing this as a HUGE favor for the pensioner, or he/she is rich enough to pay you adequately for your time. No matter how you get it apart, it will be a large royal pain to rewind with that fine/small size wire and then reconnect the wire to the slip rings. Any idea why so many of these hae failed, it might tell you what not to do when rewinding. I was quite happy putting on about 14,000 turns of 45 swg wire onto boat outboard motor magneto coils, once the traverse rate, reducing endstop/reversal points etc was set up for my 1920s coilwinder , rusted and totally seized but now rescued back into working order after decades in someone's damp and leaking shed -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/
From: Mark on 24 Apr 2008 17:42 N_Cook <diverse(a)tcp.co.uk> wrote in message news:fupo1o$erd$1(a)registered.motzarella.org... > A pensioner has asked me about possiblity of rewinding some of these magneto > coils. > http://home.graffiti.net/diverse:graffiti.net/K2F.jpg A friend of mine reconditions magnetos as a sideline/hobby. I will ask next time I see him if he would be willing to help you via email. I hope you already have Coil winding machine with turns counter Vacuum chamber -
From: Colin Horsley on 25 Apr 2008 02:13 "N_Cook" <diverse(a)tcp.co.uk> wrote in message news:fupo1o$erd$1(a)registered.motzarella.org... >A pensioner has asked me about possiblity of rewinding some of these magneto > coils. > http://home.graffiti.net/diverse:graffiti.net/K2F.jpg > laying on cm/mm graph paper. > Orangey section is the laquered coil. > C area is the contact patch (supplying 2 HT leads in turn) moulded into the > surrounding paxolin? insulation, continued out to the boss marked P, but > otherwise looking like the tarnished brass sections in colour , marked B. > The curve above the C is the shape of one end of this contact section, not a > trick of the light. > A is aluminium housing for the contact breaker > First comment is he has 5 of these , all not working at all or properly, so > probably not good design anyway, as none were abused in use. > He has one good magneto , he moves around 3 bikes. He can get some or all > nonworkers commercially reconditioned , at a price each. But of course he > would like all 5 rewound and he knows, like me , that having researched and > set-up for one then the following 4 rewinds are much easier. I use a > coil-winder machine but little experience of these sorts of coils. > No electrical data found on the net for these. > As received by me, the secondary measured 22K ohm, now reads 6.3K , at this > stage, presumably shorted turns rather than a break for this one. > He has some sort of technical data for these , when he can find it, but > first thing is how to (after desolding) slide the laquered-in coil out of > the central section between the 2 steel pole pieces marked S, and because of > the boss marked P that holds the HT wire lead out, coil would have to be > removed from the other open section, underneath in pic. Anyone know the > number of turns, wire gauge to save having to count off ? and details of > interlayer insulation (if any). How is the HT coil output removed from the > boss P or whereabouts is the join to a feedthrough under the output laquer? > > -- > Diverse Devices, Southampton, England > electronic hints and repair briefs , schematics/manuals list on > http://home.graffiti.net/diverse:graffiti.net/ This magneto was fitted to quite a lot of British bikes from the 50's and early 60's. Myself, I'd find a professional restoration service to do the job. Safer in the long run, I think. Sorry, I can't help with a service manual. Colin
From: The Older Gentleman on 25 Apr 2008 02:23
N_Cook <diverse(a)tcp.co.uk> wrote: > I was quite happy putting on about 14,000 turns of 45 swg wire onto boat > outboard motor magneto coils, once the traverse rate, reducing > endstop/reversal points etc was set up for my 1920s coilwinder , rusted and > totally seized but now > rescued back into working order after decades in someone's damp and leaking > shed Ah! Are you available for alternator rewinds? -- BMW K1100LT Ducati 750SS Honda CB400F, SL125 & SH50 chateau dot murray at idnet dot com "What you're proposing to do will involve a lot of time and hassle for no tangible benefit." |