The Bucking Magnet Motor

[z.monkey]

Howdy LC,

Yeah, using a hand drill for these holes and taps because I don't have a way to clamp the part under my mini mill.  Also I have generally used a hand drill for taps and unibits previously.

About the balance thing, there is a bit of the tap in there to make up the difference, and I also included as much of the screw as I could...

I used epoxy instead of gorilla glue on 2 magnets.

This is a tricky thing about the balance, there are many angles and holes.  But the majority of the mass is very light and the heavy (dense) parts are the magnets and the screws around the periphery.  This will hopefully mitigate my dimensional and density infractions, but also act as a flywheel.

I can already see that I'll be making more of these, and it may take several revisions to get it right...

Make it perfect on the first try?

I have yet to do that ever...

But Revision A is generally production worthy...

So, got all the magnets installed on the Stator today...

Making a movie, up in a bit...

[z.monkey]

Finished Stator Disk movie...

http://www.youtube.com/watch?v=M4UWZ29PWA4

[z.monkey]

Mo betta movie...

http://www.youtube.com/watch?v=yn5jOeaD4Fw

[loosecannon]

well it looks absolutely beautiful!

at this point, if the epoxy seemed to be secure enough, i might just epoxy all the magnets on to the outer ring to save lots of time and frustration.

seems like those will be even more difficult than the inner ring was.

good luck!
LC

[tbird]

hi z,

just a thought for your next build.  on the rotor, instead of tapping for the screws, why not just use a nut?  while the disk is on the rotating table for drilling out the excess weight, drill a hole under (1/8 to 1/4 inch should be enough meat to hold) each surface the magnets mount on.  then you can slide the nut in and screw together.  a drop of loctite (or a locknut) will keep it from going anywhere.

for the stator, five minute j b weld should hold the magnets nicely (no spinning force).  i use it to hold (no screws) my wind gen magnets to the rotor.  of course epoxy is also poured between and around each.  never had one come off.

also i noticed awhile back you called lexan and plexiglass the same thing.  they are not.  lexan is a polycarbonate resin thermoplastic.  plexiglass is  polymethyl methacrylate.  at this link...

http://bbs.homeshopmachinist.net/showthread.php?t=37175

the fellow gives some tips on how to machine it.  good read.

lexan is very strong.  it is used to make bullet proof windows (http://en.wikipedia.org/wiki/Bullet-proof_glass) i use it for my windows on my boat.  a bit pricey, but very good material.  holds up much better in the sun than plexiglass too.

keep up the good work!!

tom