Building the Minimag

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Stilldrillin:
Poetry! :thumbup:

David D

NickG:
Brilliant! :thumbup:

Bogstandard:
I thought that this post was done and dusted, but it seems not quite.

Julian, the supplier called me today, just for a general chat to tell me that sales of the Minimag are now climbing, and that he is returning my unit, and with it, he will be sending a new neo magnet that he is going to be trying out, to see if it will give even bigger sparks at much lower revs. I will give an update when I can get around to it.

We also discussed a little about the chain drive, and he stated that he is using an 8mm wide one, plus also, because of the slight slackness in the chain drive, it somehow gives a spark boost as it comes up to the generation stage, the chain sort of lags a little as the pressure from the magnet is felt, then gives a forwards kick when the chain takes up the slack. A very interesting phenomenon, and I suppose could also be realised with a geared drive, if the mesh was left a little on the slack side.

I have already decided I will be going with a smaller chain drive system, these people do a 6mm wide series for very reasonable prices.

http://www.technobotsonline.com/index.php?dispatch=categories.view&category_id=193

Bogs

John Stevenson:
Sounds a bit like the impulse magneto's where the drive pauses, winds a spring up and then lets go.

John S.

madjackghengis:
Hi John, I just had to go through this build log again, what with a new posting, and was reminded of the rare earth magnets you were going to be putting in to test for low speed operation, I'm hoping you will be posting a similar video of the outcome of that, the Webster with your maggie is a very impressive display, in a large part because it is merely idling, which where mags are weakest, and show their faults, and yours runs perfectly at that speed. I'm looking forward to what comes out of the neo magnet replacement, and hope to see some testing. I've got a spark tester for cars, essentially a point with a clamp on it, with a plastic holder holding a screw with a point, and a clear cover, so you can adjust the distance the spark has to jump, and it's a good "seat of the pants" test of how much energy the spark actually carries, better than just a "fat" spark at the plug, or a "weak and skinny" one. Just cleaning a working magneto, getting the brass contacts for the high voltage clean, and ensuring clean points and good gap can easily double the spark output and it is a repeatable test with this little cheap and easy bit of tool. In any case, it was good to refresh my mind on your magggie build and the success you show is available for such engines. :beer: Cheers, Jack

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