Thread Number: 71927  /  Tag: Modern Automatic Washers
A simple weight reduction tactic - or fixing what ain't broke?
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Post# 951528   8/4/2017 at 05:32 by wft2800 (Leatherhead, Surrey)        

Saw this on BBC News and wondered what you'd all make of it. Replacing concrete ballast on front-loaderes with a water ballast tank, to be filled on installation? Good idea or asking for trouble?

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Post# 951530 , Reply# 1   8/4/2017 at 05:41 by MrAlex (London, UK)        

I saw that this morning too..

I'm just thinking.. Wouldn't the water get kind of slimy and disgusting in there?


Post# 951533 , Reply# 2   8/4/2017 at 05:48 by foraloysius (Groningen, the Netherlands)        

foraloysius's profile picture
I saw it on Facebook. The specific weight of concrete is much higher than the specfic weight (gravity) of water. So you would need a much bigger tank to hold the water than the size of the concrete weight.

Post# 951536 , Reply# 3   8/4/2017 at 06:12 by Tomturbomatic (Beltsville, MD)        

In old Westinghouse washers, the weights were cast iron and they were able to form it into a complete ring around the front of the tub, but then they changed to cheaper concrete. The machines were not as stable because the concrete was not as dense as the iron so density is important. 


Post# 951541 , Reply# 4   8/4/2017 at 06:55 by vacerator (Macomb, Michigan)        
Been going on for years now.

GE also used a concrete block and cable to balance their top loaders.
With tubs, baskets, etc. being lighter, balancing can be done centrifugally, and with springs and hydraulic shock absorbers. Of course, we have seen some modern washers destruct in high spin speeds.


Post# 951550 , Reply# 5   8/4/2017 at 07:47 by Rolls_rapide (Scotland, UK)        
Done before!

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I think it has indeed been done before - in the form of the "Reason" washing machine, which has been in stasis for yonks now.

Look at this link. Scroll halfway down the page, and you will see their ballast tanks.


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Post# 951555 , Reply# 6   8/4/2017 at 07:56 by Rolls_rapide (Scotland, UK)        

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Looking at the tank retrofitted to that Indesit on the BBC page, that tank sits too proud of the machine. They'll have to redesign their suspension/tub assemblies to accommodate the water tanks.

Might as well start again with a new design.


Post# 951558 , Reply# 7   8/4/2017 at 08:09 by henene4 (Germany)        

There is a huge probem with the way Reason did this though: Weights mounted to the tub will reduce the sway of tub it self. If the tanks just sit in the bottom of the machine, the cabinet won't move, the tub and drum however will.



Furthermore: For things like washing machines, weight dosen't really affect the cost of shipping much. The density of such a machine as a whole isn't really all that big:

A standard EU machine is 60cm*60cm*85cm=306000cm³. That is 306l.
A machine weighs about, let's say 100kg.
That means, it's only about 1/3 the density of water.

For shipping of such items, volume is far more significant. The only people who really care about weight are the end consumers, who by now - for the most part - get them set up anyways.


Post# 951565 , Reply# 8   8/4/2017 at 08:45 by wft2800 (Leatherhead, Surrey)        

I think the weight concern is more about reducing fuel usage in transportation and thus the all-important carbon footprint...

Post# 951570 , Reply# 9   8/4/2017 at 09:54 by Rolls_rapide (Scotland, UK)        
"the weight concern... reducing fuel usage"

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I agree with that. It is surely more economical to transport a lorry load of lighter machines than the same load of heavier machines.

Post# 951572 , Reply# 10   8/4/2017 at 10:30 by henene4 (Germany)        
Big picture

Sure, transportation carbon foorprint would be smaller.

Do most people worry about that when they buy a machine? No, they don't.

That system would mean big and thus expensive engeneering changes, reduced drum sizes and probably liability issues for verry little gain for the company.


Post# 951575 , Reply# 11   8/4/2017 at 11:00 by Rolls_rapide (Scotland, UK)        
Yes, they will.

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Especially when powerful polluting vehicles are being outlawed, and being replaced by under-powered 'Eco' ones instead.

Then it'll be a case of endeavouring to lighten the load wherever and however possible, and that means everything across the board.


Post# 951579 , Reply# 12   8/4/2017 at 11:36 by henene4 (Germany)        

That's a timeframe of 30+ years. The lifecycle of a washer design is generally 20 years or less, for the most part.

In 30 years we alread might be past the singularity...


Post# 951663 , Reply# 13   8/5/2017 at 09:03 by panthera (Rocky Mountains)        
This solution is used for

panthera's profile picture
everything from concrete to pancake mixes to paint so I can see the desire to attempt it - we're talking about a lot of mass, here.
I'm not an engineer, but my feeling is that their proposed solutions are, even with very intelligent circuitry, just not going to do what they want them to do.

As for the water 'spoiling', lots of ways around that one. They could even have the machine fill and drain every time it's used...which would, of course, defeat the whole 'eco' aspect of the thing. If my suspicions are proved right, though, first seriously unbalanced load at spin and this machine will take care of the longevity problem by self-destructing, anyway.


Post# 951681 , Reply# 14   8/5/2017 at 11:26 by warmsecondrinse (Fort Lee, NJ)        

I heard this on BBC World Service yesterday; what I heard might've been different from what you all have read. The designers seemed to be framing their project as a work-in-progress with promising initial results and by no means an end product. The main idea seemed to be the energy savings from transport of a lighter product and greater ease of installation. Using water instead of concrete would in effect allow the counterweights to be installed AFTER the machine was in place.

"That system would mean big and thus expensive engeneering changes, reduced drum sizes..."

Right. Such changes have their own CO2 footprint in that people consume resources while formulating the changes and then factories have to be rejiggered. Regardless of how small a footprint the changes might have, they need to be figured in. Also, reduced drum sizes mean a greater number of loads.

"The specific weight of concrete is much higher than the specfic weight (gravity) of water."

This was acknowledged in the article I heard. The designers seemed to believe they would eventually be able to compensate for that.

It'll be interesting to see if they get anywhere with this.

Jim


Post# 951688 , Reply# 15   8/5/2017 at 12:21 by splittub (Europe)        

Yet another example of eco-hysteria leading to quality reduction.

Post# 951704 , Reply# 16   8/5/2017 at 16:36 by Rolls_rapide (Scotland, UK)        

rolls_rapide's profile picture
They'll probably design the tub and counterweight tanks in such a way, that they'll pop in the drum and seal the whole lot up.

Then, when it comes to replacing one single component - no can do. You'll probably have to buy the complete unit: drum + tub + counterweight complete.

And they'll have to have more hosepipes to fill the tanks and drain them. Software will have to be written to prevent the machine's operation if the tanks are empty.


Post# 951748 , Reply# 17   8/5/2017 at 20:57 by Tomturbomatic (Beltsville, MD)        

The WP-built 29" combos used water to balance the load via the three ballast tanks in the drum. I believe the ZUG does that now. The drum in the combo did not have much in the way of suspension separate from the machine except for the flexing of the machine frame which actuated the balancing process. I would hope that the ZUG has a simpler balance system, but these two machines, which use water to dynamically balance the spinning drum, use the weight of the water most efficiently to reduce the cause of the forces that need to be controlled.


Post# 951820 , Reply# 18   8/6/2017 at 10:04 by vacerator (Macomb, Michigan)        
Those 29 inch Whirlpool

and Kenmore combos were awesome. Many owners were upset when parts became obsolete for them. My dad used to repair them. He told me they also had an air compressor.

Post# 951855 , Reply# 19   8/6/2017 at 15:05 by Tomturbomatic (Beltsville, MD)        
Good memory you have!

The air compressor was mounted on top of the transmission and was powered by an eccentric in the transmission. A hose went to the air-driven clutch by way of the balance sensor between the outer tub and the right front frame member of the machine. As the tub revolved going into the high speed spin, the balance sensor had two jobs: to bleed air out of the air system and direct a jet of water into the balance tank opposite the heavy side of the tub at each revolution. In the transmission, the air inflated a diaphragm that pushed against the clutches which, once the load was balanced, allowed the transmission to shift the cylinder into the rip-roaring 400 rpm spin speed. When you consider all of the things, like an errant piece of lint, that could block any part of that complicated system, each successfully completed load was a triumph over adversity and probability. The loss of flexibility of that diaphragm at the front of the transmission is the main reason these machines stop spinning.





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