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I Got the 2 top 2 bottom and rotor drilled tonight after plenty of practise, i ended up making a mistake on one rotor so glad i had 2 in the end.
The thing with the wood flat bits is to avoid them oscillating as they cut, if they oscillate at all then the hole will be over size, i ended up using a 19mm bit for the 20mm magnets and then reaming slightly with a 20mm bit, this worked well.
I thought i had 18mm OD bearings but they turned out to be 16mm, this was easier than the 19mm using a flat wood bit.
So that was the rotor done.
For the top and bottom plates i had 4 x 5mm large disc's, i G Clamped the lot together and pilot drilled with 3mm holes, i then drilled all coil mounts with 6mm holes and put the 4 holes around the perimeter edge using 8mm drills, the center hole was a real problem, i couldn't reach it on my bench press drill so had to use my hand drill, this was almost disastrous, as EM found out, it grabbed and cut very poorly, i think this was because i could not hold the drill true, anyway the center hole is a bit rough and slightly chipped as it went through all 4 plates, but because i am using this hole to bolt either side a M8 threaded rod and the rotor bearing will be in the rotor it does not matter so much.
I now need to work out how to securely mount the bearings in the center of the rotor and still allow myself to bolt the M8 threaded rod to the center of the bearing also, i think i need a sort of 8mm sleeve to fit over the M8 threaded rod each side of the bearing and bolt this together, and then maybe glue discs either side giving clearance to the sleeve but secure the outer part of the bearing to the rotor, i am going to need to use glue i think and will need to be carefull not to get this in the bearing workings.
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Topic: RomeroUK Replication Muller Variant Device (Read 140208 times)
