Spin Speed Measured by Stroboscope!

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The 1947 GE and the 1958 Unimatic need to be pulled over for speeding at least 20 rpms faster than the speed limit. 
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Very cool!
Some of the numbers were much higher than I thought they would be.
Poor Whirlpool Combo.
I wonder what the spin speed is on your Duomatic Combo?
B
 
Nice little strobe speed meter-where do you get those?Could be interesting to have.At best -at both VOA worksites,DC plant and Greenville transmitter plants they had Strobotaks.You used the meter by shining its strobe on the item measured and turned a dial on the Strobotak until the item appeared to be standing still-then you read the speed from the dial.No tape or anything needed-if the item was completely smooth and no marks-you would use a dark peice or tape or magic marker.Another speed tester had a shaft you held against the item measured.Used it for tape deck capstans.For other things-like the washers-would be dangerous.Don't want to hold the speedmeters device against a large spinning object like the washer drum!That Monarch meter looks handy and safe.
 
Stroboscope would

freak out on my Spin Dryer, and so would everyone else. It spins at a mere 3217 rpm. Love it! Cannot belive I have ever done laundry without it.

mayken4now-2014070510170702041_1.jpg
 
Glad to see SQ was there

carrying the freight big time!

These "old technology" machines have a thing or two or three on the so-called modern machines that really make a big deal about getting to 1000 RPM on spin.
 
that was really cool....

seeing the actual numbers of how fast each different machine spins.
GREAT thread!!!
thank you for sharing this information.

and CONGRATULATIONS
to the newlywed couple!!!

best wishes to you both...

lovingly,
hippiedoll/christina

:o)
 
We used Jeff's first scope to determine that my Maytags with the 50 cycle pulley kit spin at 757 RPM. It was so neat, when we had the perfect reading, the whole inside of the washer looked like it was standing still, sorta like the freeze-frame motion when dancing under strobe lights. With that one, you had to have some idea of the speed and then fine tune it until what you were looking at stopped moving.
 
How cool is that?! Just one question: Why is the '57 Frigidaire so much slower than its older brand mates? It's a Unimatic, isn't it?

Edit: My bad; the '57 is a Pulsamatic.

Not at all surprised at the pokey speed posted by the Kenmore. No wonder they were paired with such powerful dryers.
 
Spin speed alone does not equal great extraction.

 

Yes the poor Whirlpool combo spins at "only" 205 RPM, but you have to factor in the drum is a very large 29" in diameter!    Because of this large drum it most likely extracts better than you'd think.

 

Also, Steven's little spin dryer in reply #7 above may spin at an extremely fast 3200 rpm, but the spinner can is only what, 6 or 7 inches in diameter?    Because of the small diameter it must spin this fast to achieve great extraction.

 

Unfortunately I don't know how to do the math to figure all this out.    Perhaps someone out there (Phil - Kb0nes?) can chime in to shine some light on this?

 

Kevin

 

**Jerry, AW's webmaster got married last weekend.

 

 
 
And Launderess has warned us all about these excessive spin speeds and how they can damage fibers, as in these high speed foreign jobs.
 
Kevin and all,

The calculation for the relative G-Force is really pretty simple, here is the formula

G Force = (RPM/1000)^2 * 28.4 * Radius in Inches

You can swap the number 28.4 for 1.118 if you want to input the tub radius in millimeters.

So if I go ahead and calculate based on this information

Unimatic 1167 RPM with a 10" tub radius I get 386 G

Hoover TT at 2222 RPM with a tiny 3-7/8" Radius develops 543 G

WP Combo 205 RPM with a 14-1/2" radius develops a mere 17 G!

Indeed an increase in the radius of the spinning drum does directly increase total extraction G force. But changes in RPM alters the total G force at the square of the speed change so RPM is more important overall. This is the reason that small high RPM spinners do extract so well. If you could only get that big tub in the Whirlpool combo to spin at 1150 RPM it would develop more extraction G forces then even that little Hoover TT at nearly twice the RPM! Alas you couldn't pay me to be in the room with it doing that.

Its a neat test all in all, course the true proof in the pudding would be the as extracted weight of a reference load of rags. A longer spinning cycle time will likely make up for lower extraction forces etc.

Attached is a Nomogram I found on the web to calculate G-forces. Also here is a link to an online calculator if that makes things easier:

http://www.calctool.org/CALC/phys/newtonian/centrifugal

kb0nes-2014070623554502614_1.gif
 
Old Strobe Light

One picture with flash, to show the strobe light; one without, to show the fan blade. Low speed on the fan was about 850 rpm.

I seem to remember the spin speed on Blackstones to be in the vicinity of 600 rpm.

blackstone-2014070808245209315_1.jpg

blackstone-2014070808245209315_2.jpg
 
I was wondering, could the reason behind the faster than advertised spin speeds be because the tubs were empty? Or would they spin at the same speeds full of wet clothes? It seems like the added weight would slow them down a bit, but then I'm thinking it wouldn't. What do you think?
 
NEW MATERIAL ! YAY !

Eugene Frigilux ~ the Frigidaire spinning in the 600's is a Pulsamatic, which pulsates and spins at an rpm of 660 ish. The doctrine explains this double 660 stuff. Re-reading carefully I see you got it. There is a reason for the identical speeds, but I don't have it mastered.

Kitty ~ An Easy Spin spins at 900

Guys ~ you look wonderful and it's so nice to have something new under the sun. Though we live and die for Whirlpool/Kenmore, their spinning is truly tragic. Was just lamenting that interesting reality moments ago as I had the whole hood up on the Mark XII spray rinsing
 
Vern,

Ultimate steady state spin speed isn't likely to vary much loaded vs unloaded. Loaded the increased inertia will cause the basket to spin up slower but eventually it will reach the same RPM. The only reasons it wouldn't would be due to increased aerodynamic drag from the clothing or higher bearing drag due to weight or imbalance. If the imbalance is significant perhaps the belt or clutch could slip a bit more which would reduce spin speed. It would be an interesting thing to do to see if theory and practice meet though!

I've had the same discussion with car/motorcycle guys that think a lighter car will have a higher top speed. It will accelerate faster due to the reduced inertia but top speed is unchanged as it is only modified by drag and frictional losses.
 
Actually, Correctoman, Gary just said exactly that.  

 

Message in Photo # 19, the last one of the four great friends, founders,  and REAL bosses of Aworg (although you'd never know it or hear it from them) : You can take being single out of a guy, but you can never take the washer out-- EVUHHHH. 

 
 

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