HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Page 1/2  >  >>
William K.
User Rank
Platinum
A similar problem with the whirlpool dryers
William K.   6/11/2013 8:12:57 AM
NO RATINGS
Maytag is not the only company to cut a corner on squirrl cage blower designs. Our whirlpool dryer, and the one belonging to a friend, also developed the rubbing blower syndrome, but the fix was not that easy. It seems that the main blower is only connected to the drive shaft by a rather weak spring clamp, with no means of positive attachment. But the blower is not perfectly balanced, and not immune to the accumulation of a bit of lint, since it is downstream from the drying clothes. What happens is that the blower wheel vibrates just a bit on the shaft, which the atachment is a split hub made of the same nylon-type of material. The result is that there is wear, resulting in greater clearance, resulting in greater vibration. Eventually the wear will reach the point that the blower wheel no longer engages the shaft, and so it does not spin, resultingin no airflow, which leads to an overheating condition, which causes the non-resettable overtemperature device to open, leaving the system non-functional. The only repair is replacing the blower wheel and the overtemp protection device, which are accessed from opposite acess points on the dryer. But that does not eliminate the problem with the drive connecton to the blower wheel, which the replacement is not improved from the original design. The (sort of) fix is adding a screw type hose clamp in place of the weaker spring clamp, although a real fix would be a solid hub, close fitting, and a different design to keep it on the shaft, such as a bolt in the end of the shaft and a cup-washer to clamp the hub. BUT of course that would mean changing the design and adding a production step or two. Better quality does cost more to build, it seems.

Rob Spiegel
User Rank
Blogger
Re: A similar problem with the whirlpool dryers
Rob Spiegel   6/11/2013 1:40:35 PM
NO RATINGS
William K, I'd love to use this as a Monkey blog. Please send along your OK to:

rob.spiegel@ubm.com

Cabe Atwell
User Rank
Blogger
Re: A similar problem with the whirlpool dryers
Cabe Atwell   6/11/2013 5:23:45 PM
NO RATINGS
Geez,

Seems like it was designed to fail. Then, resulting in further sales down the line.

Serviceable features need to be accessible. It's 2013 already...

C

RBPrice
User Rank
Iron
Re: A similar problem with the whirlpool dryers
RBPrice   6/11/2013 9:07:49 PM
NO RATINGS
Not qute designed to fail but it sure is hard to not be paranoid about the failure to tell the user that there was a filter that had to be serviced periodically so some repair person could charge an outrageous sum for a trivial service operation. 

That is an evil monkey at work not a dumb monkey like the second issue with the blower.

William K.
User Rank
Platinum
Re: A similar problem with the whirlpool dryers
William K.   6/11/2013 11:52:09 PM
NO RATINGS
Not letting folks know about the filter changing requirement is the one way that they have of keeping those totally unqualified fingers out. And there are a lot of folks so inept that they cross-thread lightbulbs. Of course, some companies go way overboard, like the five-point anti-tamper screws on a seagate external hard drive. They were a pain to remove, but I did remove them and replaced the failed hard drive. Possibly some of it comes from a desire to avoid litigation for somebody injuring themselves, inept people do that a lot.

But on that dishwasher, the well designed ones use a different system to avoid the need for filter cleaning. And some of the other good ones make the filter easy to find. That may be part of the difference between an older expensive unit and a current cheap one.

William K.
User Rank
Platinum
Re: A similar problem with the whirlpool dryers
William K.   6/11/2013 11:54:00 PM
NO RATINGS
I will send an email about that in the next two days, Rob.

RBPrice
User Rank
Iron
Re: A similar problem with the whirlpool dryers
RBPrice   6/12/2013 7:48:07 AM
NO RATINGS
True enuf about keeping inept people from hurting themselves but how about at least warning to the owner that the filter needs to be serviced periodically.  That monkey mind set is not a good way to build customer satisfaction and loyalty. 

Adding a small boss on the end of a molded nylon squirrel cage rotor is not a very expensive thing to do. The material cost is close to zero and the cost to machine the recess in the mold is divided by 50,000+ parts.

What it really boils down to is the mindset of the company management and their focus on quarterly earnings instead of long term sales based on a quality product. I have, unfortunately, seen it at several companies that I have either worked for or done consulting work for.

Larry M
User Rank
Platinum
Re: A similar problem with the whirlpool dryers
Larry M   6/12/2013 9:42:39 AM
NO RATINGS
I might have used one of those spring-type hose clamps instead of a worm clamp to hold the rotor on the shaft, since it would seem to have less effect on balance.

And I might have used a pop-rivet on the fan cover if I didn't have a shorter screw.

GTOlover
User Rank
Platinum
In defense of Maytag
GTOlover   6/12/2013 10:56:02 AM
NO RATINGS
I am only defending the filter design and not the bearing issue!

I have had a maytag dishwasher (and other brands) and most all of them suggest rinsing the dishes prior to loading into the machine. But, I just load them into the dishwasher with all the clumps of food stuff, ketchup piles, and corn kernels still on the plates. I even throw in the mashed potato spoon still full of junk! Knowing this, the manufactures have to filter the pump (which is usually a screen on the floor of the unit). But even this can suck those mashed potatos into the system. One thing that seems to be constant is the wash arms are two piece designs glued together. Thus, the better manufactures make sure to filter this part to prevent the holes from clogging up. The Whirlpool dishwasher I currently have does not and the wash arms got plugged up. To fix them I had to purchase new ones. Now I take them out about every 6 months and thourghly clean them out!

So (and this is only a guess on my part) I think Maytag may actually have been trying to prevent the spray arms from clogging up. But why they do not mention this filter in the manual is monkey material!

Rob Spiegel
User Rank
Blogger
Re: A similar problem with the whirlpool dryers
Rob Spiegel   6/12/2013 1:26:34 PM
NO RATINGS
I agree Cabe, but as big box appliances add more electronics, they seem to lose dependability. Time after time, our Monkey writers regret having given up their mechanical washers, dishwashers and dryers.

Page 1/2  >  >>


Partner Zone
Latest Analysis
Take a look at the top 20 US undergraduate engineering programs. Then tell us -- did your school make the cut?
Producing high-quality end-production metal parts with additive manufacturing for applications like aerospace and medical requires very tightly controlled processes and materials. New standards and guidelines for machines and processes, materials, and printed parts are underway from bodies such as ASTM International.
Engineers at the University of San Diego’s Jacobs School of Engineering have designed biobatteries on commercial tattoo paper, with an anode and cathode screen-printed on and modified to harvest energy from lactate in a person’s sweat.
A Silicon Valley company has made the biggest splash yet in the high-performance end of the electric car market, announcing an EV that zips from 0 to 60 mph in 3.4 seconds and costs $529,000.
The biggest robot swarm to date is made of 1,000 Kilobots, which can follow simple rules to autonomously assemble into predetermined shapes. Hardware and software are open-source.
More:Blogs|News
Design News Webinar Series
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
5/13/2014 10:00 a.m. California / 1:00 p.m. New York / 6:00 p.m. London
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Sep 8 - 12, Get Ready for the New Internet: IPv6
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: September 30 - October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service