Lucas K2F magneto coil rewind
in [Classic Motorcycles]
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From: N_Cook on 24 Apr 2008 06:39 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/
From: Dr Ivan D. Reid on 24 Apr 2008 08:43 On Thu, 24 Apr 2008 11:39:33 +0100, N_Cook <diverse(a)tcp.co.uk> wrote in <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. You don't say what make it is, nor which bike(s) it fits. > 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. A quick educated guess, and I found a very similar device here: http://www.srm-engineering.com/electrical1 -- Lucas K2F. The company claims to have a complete reconditioning service. > 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? There's an exploded view here: http://members.aol.com/Pinman1/blowup.htm http://members.aol.com/pinman1/magnetos.htm -- sounds like disassembling the armature is best left to someone experienced. Workshop manual here: http://www.bolsover.com/lucas/sectionL5partA.pdf One particular item was: primary 20 g 4x45T; secondary 40 g ~30x250T by the looks of it: http://www.britbike.com/ubb/noncgi/ultimatebb.php?/ubb/get_topic/f/11/t/002638/p/1.html -- Ivan Reid, School of Engineering & Design, _____________ CMS Collaboration, Brunel University. Ivan.Reid@[brunel.ac.uk|cern.ch] Room 40-1-B12, CERN GSX600F, RG250WD "You Porsche. Me pass!" DoD #484 JKLO#003, 005 WP7# 3000 LC Unit #2368 (tinlc) UKMC#00009 BOTAFOT#16 UKRMMA#7 (Hon) KotPT -- "for stupidity above and beyond the call of duty".
From: Dr Ivan D. Reid on 24 Apr 2008 09:04 On Thu, 24 Apr 2008 11:39:33 +0100, N_Cook <diverse(a)tcp.co.uk> wrote in <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. [Idiot; Read the Subject line] > 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. http://www.srm-engineering.com/electrical1. The company claims to have a complete reconditioning service. > 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? There's an exploded view here: http://members.aol.com/Pinman1/blowup.htm http://members.aol.com/pinman1/magnetos.htm -- sounds like disassembling the armature is best left to someone experienced. Workshop manual here: http://www.bolsover.com/lucas/sectionL5partA.pdf One particular item was: primary 20 g 4x45T; secondary 40 g ~30x250T by the looks of it: http://www.britbike.com/ubb/noncgi/ultimatebb.php?/ubb/get_topic/f/11/t/002638/p/1.html -- Ivan Reid, School of Engineering & Design, _____________ CMS Collaboration, Brunel University. Ivan.Reid@[brunel.ac.uk|cern.ch] Room 40-1-B12, CERN GSX600F, RG250WD "You Porsche. Me pass!" DoD #484 JKLO#003, 005 WP7# 3000 LC Unit #2368 (tinlc) UKMC#00009 BOTAFOT#16 UKRMMA#7 (Hon) KotPT -- "for stupidity above and beyond the call of duty".
From: Ron(UK) on 24 Apr 2008 10:01 N_Cook 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? > This is the kind of question you could well ask in the newsgroup uk.rec.sheds. There are a lot of old motorbikey/engineery type folks hang out in the shed. Ron
From: N_Cook on 24 Apr 2008 11:06
Dr Ivan D. Reid <Ivan.Reid(a)brunel.ac.uk> wrote in message news:slrng11049.tk0.Ivan.Reid(a)loki.brunel.ac.uk... > On Thu, 24 Apr 2008 11:39:33 +0100, N_Cook <diverse(a)tcp.co.uk> > wrote in <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. > > You don't say what make it is, nor which bike(s) it fits. > > > 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. > > A quick educated guess, and I found a very similar device here: > http://www.srm-engineering.com/electrical1 -- Lucas K2F. The company > claims to have a complete reconditioning service. > > > 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? > > There's an exploded view here: > http://members.aol.com/Pinman1/blowup.htm > http://members.aol.com/pinman1/magnetos.htm -- sounds like disassembling > the armature is best left to someone experienced. > > Workshop manual here: > http://www.bolsover.com/lucas/sectionL5partA.pdf > > One particular item was: primary 20 g 4x45T; secondary 40 g ~30x250T > by the looks of it: > http://www.britbike.com/ubb/noncgi/ultimatebb.php?/ubb/get_topic/f/11/t/0026 38/p/1.html > > -- > Ivan Reid, School of Engineering & Design, _____________ CMS Collaboration, > Brunel University. Ivan.Reid@[brunel.ac.uk|cern.ch] Room 40-1-B12, CERN > GSX600F, RG250WD "You Porsche. Me pass!" DoD #484 JKLO#003, 005 > WP7# 3000 LC Unit #2368 (tinlc) UKMC#00009 BOTAFOT#16 UKRMMA#7 (Hon) > KotPT -- "for stupidity above and beyond the call of duty". Ta for that, i'd not found that pdf I suspect the owner has a paper version of that pdf Perhaps 40 awg in that thread , I would expect from previously winding outboard engine magnetos that it was more like 45 swg gauge. Every time I touch this armature the secondary ohms varies, 45K and 27K on the last 2 occasions, so at least cannot make matters worse. I wonder if you have to remove the pulley-like paxolin drum numbered 27 on that pinman pic, before releasing the internal HT leadout, to then remove the coil. I can now see how to remove the coil assembly but not how that leadout is connected into the paxolin drum. I can see me using glass tape being used instead of cloth for outer protection, for anti-hygroscopic reasons. -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |