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.
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.
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.
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.
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!
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.
In a bid to boost the viability of lithium-based electric car batteries, a team at Lawrence Berkeley National Laboratory has developed a chemistry that could possibly double an EV’s driving range while cutting its battery cost in half.
Using Siemens NX software, a team of engineering students from the University of Michigan built an electric vehicle and raced in the 2013 Bridgestone World Solar Challenge. One of those students blogged for Design News throughout the race.
Robots that walk have come a long way from simple barebones walking machines or pairs of legs without an upper body and head. Much of the research these days focuses on making more humanoid robots. But they are not all created equal.
For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This discussion will examine what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.