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A sad sad day...

11:18 AM 09/01/2012

I saw my first UAV drone fly over yesterday. It had to have been a government one because of the size. It flew over below the 500 foot level and made a distinctive buzzing sound.

I can't express the mix of emotions I had when I saw it but the biggest one was anger. It was like I was watching the beginning of every scifi movie where the government takes over and implements martial law.

I think I'm going to go have a chocolate donut now...

Mashblock - sorry I missed the one post about the electric motor for my air compressor. I am looking at one on Grizzly for about $160 shipped but haven't pulled the trigger yet. What I'm looking for is a 1500 - 1700 rpm, 110V AC, 1HP or better motor in either clockwise or reversible form. Shaft doesn't matter too much because I'm putting a belt pully on it. I priced rewinding locally - $400 minimum. So much for a renewable society eh?

*heads off to nom a chocolate donut*

Cross-posted from Dreamwidth ( http://nimitzbrood.dreamwidth.org/262506.html ) but feel free to comment here as well.

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( 5 comments — Leave a comment )
Sep. 1st, 2012 10:31 pm (UTC)
$400 minimum? Yikes! The price on the Grizzly sounds exceedingly good - what's your source*?

I take it you've ohmed the windings by themselves to elminate a bad cap or start switch? Gotta ask these things - nine times out of ten it's just a capacitor, which is silly cheap to fix yet causes many small compressors to get thrown away.

*I need a 1HP, 1700RPM, 220V, 100SF, CW or reversible, resilient cradle base; frame/shaft unimportant. The rubber mount doubles the price on these things! Application is a 10CFM rotary vacuum pump - the motor I have on it is a solid base, which is too noisy for my liking.
Sep. 1st, 2012 10:39 pm (UTC)
I didn't ohm the windings but when it went it was a puff of smoke from within the motor not the cap. It was almost like a movie special-effect. :-)

The source for the Grizzly is:


Should be good for your application.
Sep. 1st, 2012 11:18 pm (UTC)
No good for my app - note the mounting plate welded to the shell; already have one like that and it's too loud...

Is your defective motor a TEFC model like the ones pictured on the link? In this case a bad cap can make an impressive puff of Magic Smoke, which mostly comes out around the bearings because the connection box and cap covers have static gaskets and there's much less pressure drop at the shaft seals.

Did it fail on start or while running? Does it spin freely when you turn the shaft by hand? You really might be able to fix this...
Sep. 2nd, 2012 02:24 pm (UTC)
You do know you can isolate the motor using a thick rubber pad underneath right? That would pretty much eliminate all mounting noise transmission.

As for the cap - you're correct. I did not check it and it is entirely possible the smoke could have been rerouted. I'll see if I can't get that cover off today and look at it.

Bah. I'm getting lazy.
Sep. 2nd, 2012 07:52 pm (UTC)
Yep, there's a pad underneath - the mounting bolts still couple the motor and pump base(which also sits on a rubber pad, then concrete) too tightly. Rubber washers top and bottom would take out a little more, but make tensioning the belt a royal pain.

The pump itself is nearly twice the size I need but unless I find a *really* good deal on a smaller one, changing the motor is the fix.

Too many chocolate donuts?
( 5 comments — Leave a comment )



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