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WKetel
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re: Propeller beanie design problem: attaching the propeller to the motor
WKetel   3/24/2013 2:40:33 AM
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Probably the simplest similar adapter would have been a piece of insulation from a chunk of number fourteen copper house-wiring cable. From each foot of wire you could produce about 36 of the 3/8 inch long adapters, and at about 90 cents a foot for the two conductor cable it would have been quite cheap. But those spacers are a more elegant way to do it.

ai5ee
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re: Propeller beanie design problem: attaching the propeller to the motor
ai5ee   3/22/2013 9:36:04 PM
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I would go with magnets for mounting.

ai5ee
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re: Propeller beanie design problem: attaching the propeller to the motor
ai5ee   3/22/2013 9:35:11 PM
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I thought of making a powered propeller hat a few years ago. I wanted the propeller to turn slowly enough to be able to see the blades (2 or 3 revolutions per second or so). I programmed a PIC to PWM the motor, but I found that there were a bunch of things that affected the speed (temperature, humidity, battery voltage...) and since I was trying to run at the hairy edge, it just didn't work very well.

seaEE
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re: Propeller beanie design problem: attaching the propeller to the motor
seaEE   3/21/2013 3:10:06 AM
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Yikes! know? no? I need to proofread my messages and get an extra hour of sleep!

seaEE
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re: Propeller beanie design problem: attaching the propeller to the motor
seaEE   3/21/2013 3:09:08 AM
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Unforunately know. Right now I am chained to my desk, and they change the combination daily. So is there a way to procure a beanie if you are not at the event? :)

OmegaMan
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re: Propeller beanie design problem: attaching the propeller to the motor
OmegaMan   3/20/2013 3:51:44 PM
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Actually, it's the tolerances that are the same.

dsando55001
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re: Propeller beanie design problem: attaching the propeller to the motor
dsando55001   3/20/2013 1:23:33 PM
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Clive: This must be a magic adapter. The ID and OD are the same. A long time ago I designed a fabricated part. The machinist insisted there was a dimension problem, I of course insisted it was correct. He later came in with a handful of metal shavings. "Here's your part" I learned my lesson.

Max The Magnificent
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re: Propeller beanie design problem: attaching the propeller to the motor
Max The Magnificent   3/20/2013 8:42:29 AM
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Great -- thanks for this feedback and correction -- I shall take David outside and give him a sound thrashing (he won't make this mistake again :-)

Max The Magnificent
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re: Propeller beanie design problem: attaching the propeller to the motor
Max The Magnificent   3/20/2013 8:41:29 AM
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Good suggestion -- I'll pass this on to the designer -- in fact the motor can be spun in either direction at variable speed under program control. Will you be attending Design West?

Max The Magnificent
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re: Propeller beanie design problem: attaching the propeller to the motor
Max The Magnificent   3/20/2013 8:40:27 AM
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One of the guys involved in this really wants to get his cap to hover about a foot above his head and to follow him around -- even turning when his head turns .... maybe in rev 2.0 :-)

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