Magnet Rotor Mould

The outer part of the \2oo stator is only to mm thick. The stator has three mounting studs set into it at radius 55 mm from the centre in a raised portion ot the casting 20 mm thick- A central hole with radius 45 allows for the shaft and hub passing through.

The tricky part is to support the studs in their correct positions during the casting* Fix them to their backplate* If the shaft has been welded on then you may have to make a hole in the island and the base to pass the shaft through. This can help you to centre the stator.

The firing comes out of the hole in the lid alongside the studs.

You may wish to make two of these moulds a5 be able to cast the two magnet rotors at once, {However the 1200 and 1800 turbines each only e one rotor with magnets on it. The iSoo also has a blank slrel disk on the other side of the stator)

Again the mould is a sandwich with a heavy base, a surround and a lid. I often use thin plywood or IIDF for the lid and then hold it down firmly ustng pieces ot steel on top. The magnets pull the steel down very hard. But the lid can be clamped down in other ways. Try to prevent the lid from sliding around once it is on

The thickness of the surround should ideally be just less than the steel disk plus magnet- This ensures that the lid bears down hard onto the magnet faces,

Fix Lhe studs to the steel back-plate during the casting process.

I he top of the island rises to the same level as the top of the !id so as to form the raised ring that the studs are embedded into.

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