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From: N_Cook on 24 Apr 2008 14:17
Ron(UK) <ron(a)lunevalleyaudio.com> wrote in message
news:M8WdnRqvBf0BD43VnZ2dnUVZ8j6dnZ2d(a)bt.com...
> 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

u.r.s added

From the Lucas pdf , under fig 6
http://www.bolsover.com/lucas/sectionL5partA.pdf
"Fit the new slip ring moulding on the shaft, taking care that the wire
enters the hole in the slip ring boss , and that it goes fully home without
bending. Seal the wire into the bosss with varnish"

Sounds a bit odd and don't know what it means yet, pushfit and varnish?.

The contact breaker housing comes off by slackening the central holding bolt
a bit and lightly tapping the bolt head to release a keyed bushing.

It looks as though a roll pin passes through both steel cheeks and through
the coil bobbin to hold the coil in place. I've not managed to shift that
with my usual use of bits of pop-rivet steel pin, so far. One hole is
slightly larger than the other and I'm assuming its a matter of knocking the
pin through the small hole of about 2.2mm diameter to release through the
larger 2.5mm hole.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



From: bobharvey on 24 Apr 2008 14:30
On 24 Apr, 19:17, "N_Cook" <dive...(a)tcp.co.uk> wrote:
> knocking the
> pin through the small hole of about 2.2mm diameter to release through the
> larger 2.5mm hole.

<Sucks teeth>
"There's yer problem right away, guv. You should be measuring yer
hole in 64ths of an inch for a Lucas"
</sucks teeth>
From: ��� � ����-�� on 24 Apr 2008 15:00
On Thu, 24 Apr 2008 19:17:51 +0100, "N_Cook" <diverse(a)tcp.co.uk> wrote
and included this (or some of this):

>From the Lucas pdf , under fig 6
>http://www.bolsover.com/lucas/sectionL5partA.pdf

>"Fit the new slip ring moulding on the shaft"


Oo-er Missis.


--
��� � ����-��

Insanity is doing the same over and over again and
expecting a different result. Einstein.

From: hr(bob) hofmann on 24 Apr 2008 15:45
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.
From: shazzbat on 24 Apr 2008 17:06

"��� � ����-��" <ron(a)spamall.com> wrote in message
news:84m1141fpjva4ca9k4of12pu2phm253baf(a)4ax.com...
> On Thu, 24 Apr 2008 19:17:51 +0100, "N_Cook" <diverse(a)tcp.co.uk> wrote
> and included this (or some of this):
>
>>From the Lucas pdf , under fig 6
>>http://www.bolsover.com/lucas/sectionL5partA.pdf
>
>>"Fit the new slip ring moulding on the shaft"
>

The K2F magneto. Blimey, I haven't even heard of that since I had one on a
Matchless G12 in 1972.

And they say abfgnytvn isn't what it used to be.

Steve


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