Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.
The NuTone 8663RP (for future reference) vent fan in the Black Bathroom began making horrible grinding sounds and, after a day or two, stopped turning. Pulling it out showed the impeller had slipped downward on the motor shaft:
Bath Vent Fan – impeller shift
Which meant the impeller was now resting on the steel frame:
Bath Vent Fan – impeller interference
Curiously, there’s no retainer under the impeller preventing it from sliding downward, other than good intentions and a friction fit. Nothing lasts, although it’s been working for the last two decades, so I guess it doesn’t owe me much.
My first thought was to build a steel or aluminum collar with a setscrew to hold the thing up, but I decided to try a simple bushing made of UHMW polyethylene between the motor and the impeller.
Turning it to the proper length required a test fit, then another session on a mandrel made from some aluminum tubing:
Bath Vent Fan – bushing trim
The snout came out just long enough to clear the motor frame, resting the impeller’s weight atop the bearing around the shaft:
Bath Vent Fan – bushing installation
It’s hard to see between the impeller blades, but there’s actually a bit of clearance underneath:
Bath Vent Fan – bushing installed
Which left just barely enough room on the top for the retaining clip:
Bath Vent Fan – shaft clip – detail
I had high hopes for the UHMW, but it seems any contact between the rotating impeller and the stationary bearing transmits enough sound to be annoying.
So I must break down and build a collar, although it’s off the critical path right now.
As far as I can tell from the pictures, dropping $50 on a new fan unit will get me exactly the same problem. Whether it would last for two decades before failing is an open question, but my experience with freezer fans suggests what we have is as good as it gets and making a bushing is the least-awful way to proceed.
For reasons not relevant here, we have a power lift chair which has been shedding upholstery tufts since the day we got it. After realizing this wasn’t going to stop on its own, I spent a while poking around underneath and discovered the steel struts supporting the leg rest rub along the upholstery during their entire travel:
Lift chair – strut vs upholstery
Apparently, the padding behind the upholstery pushes it a bit further out than the original design could accommodate, letting the raw edges on the steel struts shave off the fuzz.
I put relatively smooth stainless steel tape on all the protrusions and bent it around the rough edges:
Lift chair – strut smoothing
Those steel folds are smoother than they appear.
It’s not obvious this will solve the problem, but the struts seems to be scraping off much less fuzz than before, so it’s a step in the right direction.
Why is it all of today’s consumer products require 10% more engineering to work in the real world?
Spring cleaning provided the opportunity for Yet Another Episode in my long-standing battle with the Whirlpool refrigerator entropy generator:
Whirlpool Refrigerator – drawer support gluing
That little thing supports half the weight of the two drawers across the bottom of the refrigerator; how such a thin plastic member was supposed to be adequate to the task continues to escape me.
If we had to pay real money for all the repairs I’ve made to that piece of crap, we’d have replaced it long ago. The only thing that hasn’t failed so far is the compressor, so driving it until it drops continues to make sense; replacing a working anything seems like a bad idea.
As the basement’s fluorescent fixtures and lamps gradually die, I’ve been rewiring the fixtures for LED tubes, all bought from KEDSUM through Amazon. The first few batches looked like this:
Kedsum – good LED lamp
The most recent two batches seem cheapnified:
Kedsum – poor LED lamp
The tubes show similar changes, going from a stylin’ version to a simple cylindrical cap:
Kedsum vs Kedsun – tube end caps
The most recent carton label might lead you to think they’re counterfeits, but it could just be a simple typo:
Kedsum vs Kedsun – LED lamp carton
There’s absolutely no way to tell what you’re going to get from any vendor on Amazon (or anywhere else, for that matter), so there’s no point in returning them, but I’d hoped buying “the same thing” from “the same seller” would produce a consistent result.
Although different rules apply to the Park staff, so they can drive back & forth across a crowded Walkway with impunity, it’d be courteous if they didn’t block the bike rack with their vehicles. After we parked our bikes in the rack, the woman riding the third bike couldn’t get out and two other riders simply leaned their bikes against the Welcome Center.
Privilege is one thing, flaunting it seems entirely unnecessary.
I’ve yet to understand why the staff must drive over the Walkway at any time, not just park on the pedestrian plaza, as there’s a perfectly serviceable bridge designed specifically for motor vehicles barely half a mile to the south. Heck, on a clear day, you can even see it from the Walkway. [grin]
Our bikes get us from one end to the other in under ten minutes, about as fast as the Park staff can drive, so using a car doesn’t provide any speed advantage. I can carry a week’s worth of groceries in my bike trailer and rarely see the staff carrying anything bigger in the car, so a “we must haul stuff” excuse seems self-serving.
Every “unintended acceleration” mass-casualty incident involves a vehicle, a bunch of pedestrians, and a driver who never thought it could happen. Proactively eliminating vehicle traffic from the Walkway seems much easier than explaining why you didn’t.
Parking vehicles in appropriate places doesn’t require any explanation.
Thanks …
Email to Walkway Over the Hudson
I should have sent it to the sprawling NYS Office of Parks, Recreation, and Historic Preservation, but I hoped the Walkway staff could forward it to the right person. Haven’t heard anything back; I should have saved the electrons.
The Smell of Molten Projects in the Morning 