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More magneto mire

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Re: More magneto mire

Posted by anna jeannette Dixon at March 19. 2017
Previously George Phillips wrote:
Hi guys - you'll notice I'm keeping my head down while the missiles fly from one to the other over it! The history here is that the armature is what was on the bike when I bought it and looks pretty new. The body c/w magnets is one from ebay that I bought 'cos the one on the bike had a crack across the housing by the side of the dynamo drive gear at the the thinnest part. The plan was simply (!) to take out the innards and fit them in the replacement housing. As Skip pointed out I probably didn't tap the Woodruff keys in far enough and could not then get the end cover on so took up Anna's kind offer of re-assembling it all for me. Simples - no? George

 

 Hello well I have freed up the disc for the fibre gear and it now fits like a glove over the armature shaft, now with paul  wolf  offer his services it now up to you George  How I  now proceed further  is up to you, I can skim the armature steel centers up by filing by hand on the lathe  turning the lathe by hand  and checking with a set of clocking dial gauges   it's in your hands , but even if you get another body does not mean this  armature will fit right you may sill need work doing on it either way, Has I have armature isolation on only 1 quarter of the rotation of the armature  it's catching the sides  inside the body     yours anna j

Re: More magneto mire

Posted by anna jeannette Dixon at March 19. 2017
Previously George Phillips wrote:
Hi guys - you'll notice I'm keeping my head down while the missiles fly from one to the other over it! The history here is that the armature is what was on the bike when I bought it and looks pretty new. The body c/w magnets is one from ebay that I bought 'cos the one on the bike had a crack across the housing by the side of the dynamo drive gear at the the thinnest part. The plan was simply (!) to take out the innards and fit them in the replacement housing. As Skip pointed out I probably didn't tap the Woodruff keys in far enough and could not then get the end cover on so took up Anna's kind offer of re-assembling it all for me. Simples - no? George

 

 Hello well I have freed up the disc for the fibre gear and it now fits like a glove over the armature shaft, now with paul  wolf  offer his services it now up to you George  How I  now proceed further  is up to you, I can skim the armature steel centers up by filing by hand on the lathe  turning the lathe by hand  and checking with a set of clocking dial gauges   it's in your hands , but even if you get another body does not mean this  armature will fit right you may sill need work doing on it either way, Has I have armature isolation on only 1 quarter of the rotation of the armature  it's catching the sides  inside the body  nothing is bent or out of line             yours anna j

Re: More magneto mire

Posted by George Phillips at March 19. 2017
Hi Anna - if you check your "inbox" on your emails you will see I've dropped you a note rather than open this up to the world. You've certainly highlighted some faults of which I was unaware when I thought it was a simple rebuild. Please email me direct when you've read my own email. Cheers George

Re: More magneto mire

Posted by George Phillips at March 20. 2017
Hi Anna - if you'e having trouble with your emails then by all means contact me in open forum Cheers - George

Re: More magneto mire

Posted by George Phillips at March 20. 2017
Hi Anna - if you'e having trouble with your emails then by all means contact me in open forum Cheers - George

Re: More magneto mire

Posted by Barry Carson. at March 20. 2017

pity you couldnt have found something like this one at the time George and had it recondition .

http://spacottagecollectables.co.uk/product/lucas-mo1l-motorcycle-magneto/ 

 

Barry

Re: More magneto mire

Posted by George Phillips at Tuesday 09:51
Thanks for the link, Barry. That is almost what I did. I bought a secondhand body to replace the cracked one on the bike. Hence my thinking it would be a simple dismantle/reassembly. How wrong I was! George

Re: More magneto mire

Posted by ian_cordes at Tuesday 09:59

It may be worth buying that one anyway George. It is not much money, for a back-up/spare?

Re: More magneto mire

Posted by George Phillips at Tuesday 14:50
I'll wait till I've got mine back Ian. Don't want to throw good money after bad. George

Re: More magneto mire

Posted by ian_cordes at Tuesday 15:05

I know what you mean George. It is easy to accumulate parts that will never be used; I've got a garage-full! Embarassed

Ian

Re: More magneto mire

Posted by Barry Carson. at Tuesday 19:34

its ok George get your other sorted just thought it may help.

the one in the other link isn't the one i was on about for some strange reason its changed, this is the one, i hope 

http://spacottagecollectables.co.uk/product/lucas-mo1l-motorcycle-magneto-3/

 

Barry

Re: More magneto mire

Posted by George Phillips at Tuesday 20:23
That's more like it, Barry. I could be tempted by that one. Let's hope my own mag is returned soon and I can then decide on the next step. I'm still hoping to be on the road by Easter! Thanks for your input. George

Re: More magneto mire

Posted by anna jeannette Dixon at Tuesday 22:38
Previously George Phillips wrote:
That's more like it, Barry. I could be tempted by that one. Let's hope my own mag is returned soon and I can then decide on the next step. I'm still hoping to be on the road by Easter! Thanks for your input. George

 

  HELLO  George   if you like to give me your address So I have somewhere to send it too  but  the armature  is a bit big for the body and is catching inside, So No  isolation and No Spark    but it's now back together and better than I got  it  has the end cover now fits right      my emails go to Bt-yahoo,   and you have to spell my name right or  your email will not get anywhere   you need to put it in like this  all low case     annajeannette@btinternet.com   now after my Member ship runs out I will be changing my email address    yours   anna  j  

Re: More magneto mire

Posted by Andy Marks at Thursday 19:03

I have just been directed to this topic by someone and although I usually tend to try and stay out of conversations on magnetos, not wanting to look like I'm advertising, I thought I'd chip in this time...

I must confess I'm a little confused as to how we got from a drive end cover that doesn't fit to insulating cups and removing material from the magnet (OUCH!)?

When an armature has been reassembled following a rewind, it should have been checked for running true by running the armature on its bearing tracks – NOT BETWEEN CENTRES – with the clock on the small end of the taper. If it is found to be out, it needs correcting. Yes, an out of true armature is very likely to make contact with the body but removing metal from the o/d of the armature and/or from inside the body to provide clearance is NOT the way to go. It will still be out of true so that needs to be sorted first.

Once it is running true, if it still scrapes the body THEN it will be necessary to remove metal. But take this from the armature, NOT the inside of the body. This can be done as Paul suggests with a light skim, but it might be easier to put some engineer’s blue on the armature, put the mag together and find the high spots. Then just relieve these with a file. You want to remove as little material as possible as the bigger the gap between the body and armature, the less efficient the magneto will be. How you do this will depend on what equipment you have in your home workshop.

As for comments about the armature shorting out with the body and stopping the spark, this is simply wrong. Of course you don’t want any scraping for obvious reasons. But from an electrical point of view you DO need the body and armature to be in contact for a spark to occur. What do you think the earth brush is there for?

There is a great deal about how to make a magneto work properly which is not immediately obvious.  We have quite a few technical pages on our website that you might find of interest: www.themagnetoguys.co.uk . If we can be of any further help please get in touch. Either andy@themagnetoguys.co.uk or 01323 840203. I agree with Paul - this needs to be given to a professional who a) knows what they are doing and b) has the right equipment to be able to be able to do it properly. I suggest when you get the mag back you contact either myself or Paul and go from there.

Hope you get it sorted George.

Re: More magneto mire

Posted by George Phillips at Thursday 21:39
That's good of you, Andy. I've so many offers of help and advice on where to go that someone is going to be disappointed! The mag was working fine before I removed it to change the body (the original was cracked). If the armature is now catching the body I would assume it must be the new body which is at fault as the armature worked fine in the old body. Hopefully Anna will by now have posted it back so I can decide when I see it. George

Re: More magneto mire

Posted by martin_jones1 at Friday 16:25

Previously Andy Marks wrote:

I have just been directed to this topic by someone and although I usually tend to try and stay out of conversations on magnetos, not wanting to look like I'm advertising, I thought I'd chip in this time...

I must confess I'm a little confused as to how we got from a drive end cover that doesn't fit to insulating cups and removing material from the magnet (OUCH!)?

When an armature has been reassembled following a rewind, it should have been checked for running true by running the armature on its bearing tracks – NOT BETWEEN CENTRES – with the clock on the small end of the taper. If it is found to be out, it needs correcting. Yes, an out of true armature is very likely to make contact with the body but removing metal from the o/d of the armature and/or from inside the body to provide clearance is NOT the way to go. It will still be out of true so that needs to be sorted first.

Once it is running true, if it still scrapes the body THEN it will be necessary to remove metal. But take this from the armature, NOT the inside of the body. This can be done as Paul suggests with a light skim, but it might be easier to put some engineer’s blue on the armature, put the mag together and find the high spots. Then just relieve these with a file. You want to remove as little material as possible as the bigger the gap between the body and armature, the less efficient the magneto will be. How you do this will depend on what equipment you have in your home workshop.

As for comments about the armature shorting out with the body and stopping the spark, this is simply wrong. Of course you don’t want any scraping for obvious reasons. But from an electrical point of view you DO need the body and armature to be in contact for a spark to occur. What do you think the earth brush is there for?

There is a great deal about how to make a magneto work properly which is not immediately obvious.  We have quite a few technical pages on our website that you might find of interest: www.themagnetoguys.co.uk . If we can be of any further help please get in touch. Either andy@themagnetoguys.co.uk or 01323 840203. I agree with Paul - this needs to be given to a professional who a) knows what they are doing and b) has the right equipment to be able to be able to do it properly. I suggest when you get the mag back you contact either myself or Paul and go from there.

Hope you get it sorted George.

Thank goodness Paul and Andy are now on the scene. As for a while I thought the project was going T one TS UP..

Yes.  A light smear of engines blue on the inside bore of the stator. Assemble it  and after a couple of turns the dismantled rotor might have picked up a spot or two of blue. A few light strokes with a smooth flat file is all that is required. Repeat the treatment.

If you think the rotor is running  out.

V  blocks under both journals, then clock it

Regards to both.

Martin Jones

Re: More magneto mire

Posted by George Phillips at Friday 21:52
You really are a most wonderful set of blokes! What started out n this thread as a rather silly whinge about my inability to out the mag back together has become a full blown discussion on all manner of items. For which of course I'm really grateful. Anna tells e it's on its way back to me and I'm grateful for her offer of freebie help. What I thought was a simple rebuild turned out to be a bit more so I can't blame Anna. When I get it back I'll re-assess all the info and go from there. Watch this space - and thank you! George

Re: More magneto mire

Posted by George Phillips at Friday 22:45
Sorry about the typos, guys. It's my birthday. 'nuff said! George
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