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[on:]

Bought these: http://www.ebay.com/itm/280875300072?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
And I'd like to connect a platform to the motor (that would spin) but I don't know what such a part would be called. Any help?

[Reply #1 on:]

Bought these: http://www.ebay.com/itm/280875300072?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

Ha! I salvaged the same type motors from a toy micro copter.

And I'd like to connect a platform to the motor (that would spin) but I don't know what such a part would be called. Any help?

The thing that connects to the spinning part of the motor is the shaft.

[Reply #2 on:]

Shaft coupling
Something like this put smaller: http://www.reichelt.de/Potiknoepfe/ACHSKUPPLUNG-2/3/index.html?;ARTICLE=42133

[Reply #3 on:]

A hub?  A bushing?
http://banebots.com/c/WHB-HM

[Reply #4 on:]

And I'd like to connect a platform to the motor (that would spin) but I don't know what such a part would be called. Any help?

HYP-NO-DISK. watch it slowly start to turn... slowly turning... let your mind relax... let yourself go... send me money...

[Reply #5 on:]

Well whatever you call the part, I'm sure it gets dizzy. 

Lefty

[Reply #6 on:]

The two common names are, shaft and rotor.
ALT: The thingy that sticks out of the motor and can attach things to.

[Reply #7 on:]

The thing that sticks out and you can attach things to it

[Reply #8 on:]

The thing that sticks out and you can attach things to it

Yes, that is what my brother called it, when I was trying to teach him about how motors work.

[Reply #9 on:]

Prop adaptor

https://www.google.dk/search?q=prop+adapter+3mm&hl=en&tbo=d&source=lnms&tbm=isch&sa=X&ei=au0hUcHPJs2HhQezxIGgBg&ved=0CAcQ_AUoAQ&biw=930&bih=488