products offers magneto magnetizer products. About 16% of these are mobile phone bags & cases, 7% are magnetic materials, and 5% are. “Could you send plans and drawings for the magneto charger in your article?” This was the most frequent inquiry I had after my November GEM article on . I would like to build a magnet charger like the one John Rex wrote in the January I have been a full time Magneto Restorer/Repairman for quite a number of.

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Hand truck after modification- ready for mounting the charger. Repeat the procedure for the second coil except mark the terminals ‘3’ and ‘4’ instead of ‘1’ and ‘2’. Diodes absorb the energy when the switch is opened. Once the current has built to a maximum, the switch may be opened because a full charge magnteo been delivered to the magneto magnets.

Building a heavy duty magnet charger

I have always thought that you can have less turns and more current, or more magnetizr and less current in the magnet windings and still do the same amount of work. Having a large pole to charge a wide variety of magnets means you’ll need a “Rex” -type charger with many turns carrying high current.

This takes only a few seconds.

The exact number of turns is not important so don’t bother counting turns, just wind until 20 pounds of wire is on each coil. For us, the customers are our god, the spare parts are our only thing, very low business maggneto costs are easily to offer very low quotes for our clients. Subscribe and connect with more than 23, other gas engine collectors and build your knowledge, share your passion and search for parts, in the publication written by and for gas engine enthusiasts!


Magnet Charger for Magnetos

An ordinary automotive ammeter reading 50 amperes is sufficient. They have one of these near me that I have watched on and off. If mild steel is satisfactory for the pole and base pieces, then I can probably get it here locally in the smaller quantities. Blueprints for an Ironwood Engine. Most Lucas magnetos are designed so that if the magnet does not have some sort of keeper such as the magneto armatureits magnet strength does not fall significantly below the maximum operating level.

So, for these Lucas magnetos, after we have charged the magnet, we can simply remove the magneto body from the internal magnetiser’s core, and then fit the magneto’s armature.

If charging a magnet that is completely demagnetised, or when flipping the polarity of a magnet, we usually use two or three pulses. Size and expense make the charger most practical for club or group use.

Additional shaped pole pieces are useful for charging flywheels, rotors, etc. My switch came from the electric distribution room of a magnetizef manufacturing company. Final assembly Now things start to get heavy, so it’s good to build the charger onto a two wheel hand truck or other cart. The wire goes magnetizwr a tension device to keep it tight. One washer for each coil should be prepared with brass terminal screws as shown. The magnetic field is a pulse of very short duration while the capacitor discharges.

To minimize machine work, all material should be sawed to length.

It’s my January project. The minimum special order required to ship it in was more than I was willing to pay for such a small amount of material.

Magnet Charger

The pole pieces of the charger should be adjusted to concentrate the magnetic field across the magnets while on the magneto. The internal magnetiser is based on a design by Allan Hurst which was published many years ago in the Velocette Owners’ Club’s Fishtail magazine.


Magnetomotive force product of amps times turns of wire must be large enough to bring magneto magnets to saturation. When the button is subsequently released, the capacitor is discharged through the core winding. Dave Gingery is a genius when it comes to building stuff from scrap!

Say 10 volts times amps, versus volts times 10 amps, which in both cases equals watts of power, or energy. Wind the coils on a lathe using back gears and clutching. About product and suppliers: In use, the core is inserted into the magneto body so that the iron cross-piece extends between the magnetic pole pieces inside the magneto body. They have many more of them and other same subject area reprints at fair prices.

Building a heavy duty magnet charger

The American Bosch unit that sets on my bench at this time weighs pounds. To magnetkzer the coils from damage, I wound several strips of fiberglass cloth and string over the entire coil and painted them with polyester resin.

Mount the core with terminal end facing the lathe tailstock and run the lathe in reverse to make winding easy to view.

These are epoxied to each pole piece. All of this means that a far greater magnetising force is needed to achieve the required magnetic flux density at the magnet.