Servicing a dry bearing

At my father’s house today and I heard the heat pump chirping occasionally. To me, that is the sound of lubrication failure and an early state of electric motor failure. As compressors are hermetically sealed and lubricated, I was almost certain the culprit was the blower motor.

I opened up the unit and saw the blade still spun freely, a good sign. After shutting the breaker, I disconnected the compressor and powered the heat pump back up. The fan ran for about 30 seconds and started chirping again.

I proceeded to remove the motor. It is a 48Y frame 1/4 horsepower single phase motor made in 1989 by General Electric. Looking up the cost of this motor to be $160-180 in the 60C ambient temperature spec (the 40C was $60 cheaper, but would fail soon). Given the expense, I decided to experiment with servicing it.

Loosened the set screw to remove the blade. The motor has 4 long screws/nuts that hold the motor together and they were removed.  With a screwdriver, I carefully prayed the pot metal caps off each end. The armature slid out of the stator and gave access to the two sleeve bearings. I lubricated them with a grease that was convenient, but a heavy gear oil probably would have been more appropriate.

I reassembled the motor and electronically attached it to the heat pump circuit.  I decided to let it run for a while to see how it performs.  After about 30 minutes, it was warm, but silent, so I decided to end the test with a declaration of success.

The heat pump was mechanically and electrically reassembled and seems to be performing well with fresh lubrication.

Anybody curious what NEMA frames are, I attached a chart.

http://www.motorsanddrives.com/cowern/motorterms2_chart.html

On the Home Depot e-mail hack

53,000,000 e-mails.  Amounts to about 1/6 the population the United States.  Now I can’t imagine every one of those being valid.  I will confess that on occasions where I was pressed for an e-mail address, I simply made one up for the sake of moving right along without arguing with the cashier.

There are occasions where I simply can’t get away with posting bogus data.  Let’s say with Amazon, Google, Facebook, the e-mail address is an important part of your identity, and in many cases, my actual login ID.  What if one of the big guys gets hacked, or an unscrupulous employee collects and sells the data and retires in southern Snoozebeckistan?  The is a preventative measure.

I own my own domain.  Your sitting here and reading it.  No one knows of any specific e-mail address for me. One of the perks of owning my own domain is a have total control over the email addresses on my server.  I have an e-mail for each service I subscribe too, such as f@timothylegg.com for Facebook or g@timothylegg.com for all things Google.  These addresses simply alias and to a common local address that I receive mail from directly.

So yeah, some place that verifies over e-mail before creating an account, I create a special address just for them and have it delivered to my inbox.  Sometimes you find out who got hacked or sells out when I start getting Canadian Pharmacy or Russian Singles emails and that’s a bonus.  To fix it,  just rename the e-mail address and let them try to get it again.

Going wide with your e-mail addresses is the best spam filter.  They have to find it, and then after that, send me enough junk mail to where it’s worth changing my address.  I typically change my address every three or four years and have been quite fortunate.  In all of 2014, I have only gotten about 15 spam messages.

You want to send me a message on e-mail, just go to my website and look it up.  It’s current and fresh.  You know where to find me.

How safe is that old car?

Every now and then, you find something on youtube that is so fascinating that you can’t help share it with everybody you know.  You play the video, pause it, and ask yourself, “How is this going to turn out?”

A few years back, the IIHS celebrated their 50th anniversary by crash testing two cars for a direct comparison of the technologies of restraint systems and energy-absorbing crumple zones.  The subjects of this test were both Chevrolet makes: a 2009 Malibu and a 1959 Bel Air.

The outcome of the test will surprise many people, excluding a few trained engineers whom daydream about types of destructive evaluation experiments.  If you haven’t searched it out already, hit up the youtube link that I selected as being the most comprehensive.

A number of social changes occurred during this time to make safety  profitable for automakers.  The deaths of Jayne Mansfield and James Dean were catalysts and culminated with the best selling book Unsafe At Any Speed by Ralph Nader.