Cheap surplus DC motors. Back again? Or a one-time fluke?

W

wbeaty

Guest
Large-ish surplus DC motors usta be common: as takeouts from
takeup-reel direct-drives, 60s mainframe storage stuff. Nice
for big robotics, speed-control tools, crazy inventions, or use
as wind generators and classroom demos.

Where did they all go? Been years!

Holy crap, Am. Science Surplus suddenly has some in their "not yet
in catalog" section, $30. I bet they won't last. 12V, many amps,
HTI corp. Maybe this is first in a surplus wave, or maybe I'll
never see 'em again. Bought bunches for a low-RPM flywheel
device on an invention prototype

But also, has anyone seen similar motors anywhere?

Closest I've seen is Exercise Treadmill takeouts, on eBay,
expensive, since everyone in the entire green community wants them
as wind turbines. C&H sales and Herbach H&R once had big DC PMs
all the time, but none recently, and never cheap.

I see vibration-style water pump sale at sciplus too, $5. If I'm
right, those things are the 60Hz "water droplet strobe" pumps with
the series diode. Make your own 'Doc Edgerton' LED-strobe fountain
where the droplets hang in space, or rise backwards up into the
jets. Like this https://youtu.be/ZRlNOyxWWf8 But the normally
used pump is $130, Gorman Rupp GRI-17000 (or $90 on ebay.) For
five bucks I can make a water-wall of strobe streams, every stream
moving differently.


(((((((((((((((( ( ( ( ( (O) ) ) ) ) ))))))))))))))))
William J. Beaty http://staff.washington.edu/wbeaty/
beaty, chem washington edu Research Engineer
billb, amasci com UW Chem Dept, Bagley Hall RM74
x3-6195 Box 351700, Seattle, WA 98195-1700
 
On Sun, 29 Nov 2015, wbeaty wrote:

Large-ish surplus DC motors usta be common: as takeouts from
takeup-reel direct-drives, 60s mainframe storage stuff. Nice
for big robotics, speed-control tools, crazy inventions, or use
as wind generators and classroom demos.

Where did they all go? Been years!

Holy crap, Am. Science Surplus suddenly has some in their "not yet
in catalog" section, $30. I bet they won't last. 12V, many amps,
HTI corp. Maybe this is first in a surplus wave, or maybe I'll
never see 'em again. Bought bunches for a low-RPM flywheel
device on an invention prototype
Click to expand...
Could ot be that companies now want to avoid "surplus"? So when they
have a run of equipment, they order just enough parts, and when it's time
to make more, they adapt to whatever is available. So they just issue a
new model the next time. That way they don't get stuck with stock that
they no longer need, which then lands in the surplus market.

Another factor may be that with most manufacturing now overseas, there is
no "end of line" clearance for an item. Even if over in China they have
leftover parts, they aren't in North America to be sold to the surplus
outlets.

WWII surplus was once so big, decades after the war you could still buy
unused equipment really cheap. But there was a big build up of equipment,
and it kept building even as the war came to an end. Now that stuff
is mostly gone. And I gather military surplus is no longer the bounty it
once was, more recent times haven't reqired that large amount of equipment
that then became surplus, and even what's there is now handled
differently.

Michael


But also, has anyone seen similar motors anywhere?
Closest I've seen is Exercise Treadmill takeouts, on eBay,
expensive, since everyone in the entire green community wants them
as wind turbines. C&H sales and Herbach H&R once had big DC PMs
all the time, but none recently, and never cheap.

I see vibration-style water pump sale at sciplus too, $5. If I'm
right, those things are the 60Hz "water droplet strobe" pumps with
the series diode. Make your own 'Doc Edgerton' LED-strobe fountain
where the droplets hang in space, or rise backwards up into the
jets. Like this https://youtu.be/ZRlNOyxWWf8 But the normally
used pump is $130, Gorman Rupp GRI-17000 (or $90 on ebay.) For
five bucks I can make a water-wall of strobe streams, every stream
moving differently.


(((((((((((((((( ( ( ( ( (O) ) ) ) ) ))))))))))))))))
William J. Beaty http://staff.washington.edu/wbeaty/
beaty, chem washington edu Research Engineer
billb, amasci com UW Chem Dept, Bagley Hall RM74
x3-6195 Box 351700, Seattle, WA 98195-1700
Click to expand...
 
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