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Thread Number: 54423
Spin Speed Measured by Stroboscope! |
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Post# 768043 7/4/2014 at 20:29 (3,576 days old) by Unimatic1140  (Minneapolis) |
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On the Monday after the wedding Jeff came over and we measured a few of the washers spin rpm with his Stroboscope. You stick an aluminum strip to the side of the tub that the scope picks ups.
The pictures are loaded from best to worst spin speeds... | ||
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Post# 768051 , Reply# 1 7/4/2014 at 21:17 (3,576 days old) by appnut (TX) |
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Post# 768061 , Reply# 2 7/4/2014 at 22:01 (3,576 days old) by DADoES (TX, U.S. of A.) |
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| Post# 768091 , Reply# 3 7/4/2014 at 23:43 (3,576 days old) by A440 () | ||
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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 | ||
| Post# 768116 , Reply# 5 7/5/2014 at 04:30 (3,576 days old) by pulsator-power (connecticut) | ||
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Speed and marriage Who got married? Photos? | ||
| Post# 768119 , Reply# 6 7/5/2014 at 04:46 (3,576 days old) by beekeyknee (Columbia, MO) | ||
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| Post# 768157 , Reply# 7 7/5/2014 at 10:21 (3,575 days old) by mayken4now (Panama City, Florida) | ||
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.
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Post# 768167 , Reply# 8 7/5/2014 at 11:13 (3,575 days old) by RevvinKevin (Tinseltown - Shakey Town - La-La Land) |
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GREAT information! | ||
| Post# 768216 , Reply# 9 7/5/2014 at 17:11 (3,575 days old) by washman (o) | ||
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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. | ||
| Post# 768231 , Reply# 10 7/5/2014 at 18:08 (3,575 days old) by hippiedoll ( arizona ) | ||
that was really cool.... | ||
| Post# 768343 , Reply# 12 7/6/2014 at 08:21 (3,574 days old) by pulsator-power (connecticut) | ||
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Who got married? Want to know who got married, (and how was the honeymoon?) Couldn't be much of one cause you guys were measuring spin speed | ||
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Post# 768408 , Reply# 13 7/6/2014 at 13:03 (3,574 days old) by Frigilux (The Minnesota Prairie) |
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Post# 768415 , Reply# 14 7/6/2014 at 13:30 (3,574 days old) by RevvinKevin (Tinseltown - Shakey Town - La-La Land) |
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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.
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Post# 768423 , Reply# 15 7/6/2014 at 13:49 (3,574 days old) by swestoyz (Cedar Falls, IA) |
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| Post# 768424 , Reply# 16 7/6/2014 at 13:50 (3,574 days old) by beekeyknee (Columbia, MO) | ||
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Post# 768532 , Reply# 17 7/6/2014 at 18:08 (3,574 days old) by Frigilux (The Minnesota Prairie) |
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Yeah, I think the formula for extraction power looks something like this, doesn't it Kevin?
:-)
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Post# 768541 , Reply# 18 7/6/2014 at 19:11 (3,574 days old) by combo52 (50 Year Repair Tech Beltsville,Md) |
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Cool Spin Speed Tests | ||
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Post# 768633 , Reply# 19 7/7/2014 at 01:33 (3,574 days old) by kb0nes (Burnsville, MN) |
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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: www.calctool.org/CALC/phys/newton...
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| Post# 769052 , Reply# 20 7/8/2014 at 08:28 (3,572 days old) by Blackstone (Springfield, Massachusetts) | ||
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. | ||
| Post# 769062 , Reply# 21 7/8/2014 at 09:13 (3,572 days old) by kitty () | ||
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How fast does a easy spinner go? Congrats on marriage. | ||
| Post# 769157 , Reply# 22 7/8/2014 at 14:35 (3,572 days old) by StrongEnough78 (California) | ||
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| Post# 769167 , Reply# 23 7/8/2014 at 15:06 (3,572 days old) by mickeyd (Hamburg NY) | ||
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 | ||
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Post# 769171 , Reply# 24 7/8/2014 at 15:22 (3,572 days old) by kb0nes (Burnsville, MN) |
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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. | ||
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Post# 769228 , Reply# 25 7/8/2014 at 19:50 (3,572 days old) by washerlover (The Big Island, Hawai’i) |
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So I guess... | ||
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Post# 769232 , Reply# 26 7/8/2014 at 20:16 (3,572 days old) by countryguy (Astorville, ON, Canada) |
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Post# 769239 , Reply# 27 7/8/2014 at 20:50 (3,572 days old) by RevvinKevin (Tinseltown - Shakey Town - La-La Land) |
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| Post# 769267 , Reply# 28 7/8/2014 at 22:03 (3,572 days old) by mickeyd (Hamburg NY) | ||
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| Post# 769332 , Reply# 29 7/9/2014 at 06:17 (3,572 days old) by StrongEnough78 (California) | ||
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Post# 769347 , Reply# 30 7/9/2014 at 08:00 (3,572 days old) by countryguy (Astorville, ON, Canada) |
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| Post# 769530 , Reply# 31 7/9/2014 at 20:07 (3,571 days old) by 76speedqueen (Orleans County Ny) | ||
Congratulations ! | ||
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Post# 769566 , Reply# 32 7/9/2014 at 21:21 (3,571 days old) by Frigilux (The Minnesota Prairie) |
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