Pulse the magnet, then pull it out and measure the field. Then increase the voltage, remeasure, etc until it would not get a increase in strength. Any excess voltage => higher peak current was wasted as the goal was to saturate the magnet. That was how the machine was set for the run.

Build a Magneto Magnetizer SOLD OUT! $7.95 SKU 015 More Details - Build a Magneto Magnetizer SOLD OUT! Written by David J. Gingery Published by David J. Gingery Publishing, LLC ISBN 978-1-878087-45-4 5-1/2 x 8-1/2 Paper Back.

Staple Bound. If you have a particular interest in magnets, you can build this simple device to create new magnets and recharge weak ones. Although specifically designed to recharge magnets used in engine magnetos, this device can be used for producing or restoring magnets in a great variety of shapes and sizes so long as they are made of alloy steels. This is a relatively simple device. Only ordinary mechanical skills are required to build it. The metal core however is of very heavy steel and some machining operations may be required.

The online magnet charger article is from a very interesting book. Believe it or not the whole book can be downloaded for free from. Check the left side of the web page to choose your format. Its available as a PDF for your PC or other formats for even a Kindle. ---------- Post added at 12:04 PM ---------- Previous post was at 11:43 AM ---------- The link I posted earlier has a link that takes you to Google Books.

You could go directly here ---------- Post added at 12:13 PM ---------- Previous post was at 12:04 PM ---------- The encyclopedia linked here is the 1920 version. The magnet charger plans are not in it anymore. They switched to charging $1 for the plans sometime between 1918 and 1920. The online magnet charger article is from a very interesting book. Believe it or not the whole book can be downloaded for free from. Check the left side of the web page to choose your format. Its available as a PDF for your PC or other formats for even a Kindle.

---------- Post added at 12:04 PM ---------- Previous post was at 11:43 AM ---------- The link I posted earlier has a link that takes you to Google Books. You could go directly here ---------- Post added at 12:13 PM ---------- Previous post was at 12:04 PM ---------- The encyclopedia linked here is the 1920 version. The magnet charger plans are not in it anymore. They switched to charging $1 for the plans sometime between 1918 and 1920. I am looking for a plan that uses a 12 volt battery and I found a play by John Rex but that one sounds like overkill. Tim Your first decision is to identify the type of magnetos you want to re-charge, HT or LT. How wide will the magnet bars be.

What will your power source be. You can then design your charger to meet these criteria.

If you want to use 12 volts and really zap a large magneto then the Rex size will be more appropriate than the Gingery. For LT magnetos the common view is that you will need to achieve 20,000 amp turns (turns of wire around the cores x amps drawn by the copper wire). Have a look at. I set out there the theory behind the charger I made.