It is important to note the difference between bronze bushings and
sintered bronze bushings. The former require regular lubrication as does
any other plain bearing. But the sintering process produces a material that
is porous and will hold lubricant in its pores which significantly reduces
the need for regular oiling. Here's a description of proper and improper
machining of sintered bronze:
http://www.lm-tarbell.com/machining_sintered_bronze.htm
Such bushings have been used for electric motors for decades and are very
dependable. To us old-timers, they were known as "oilite" bearings. Turns
out, that is now the tradename of a company who furnishes such bearings:
http://www.oilite.com/bearings.asp
Greg Bogantz
----- Original Message -----
From: "Randy Larson" <[email protected]>
To: "Antique Phonograph List" <[email protected]>
Sent: Monday, January 28, 2013 12:35 PM
Subject: Re: [Phono-L] Edison Bearing
Ronald
Thanks so much for your input, I really appreciate it. The only reason I
used stainless steel is that it would last longer. The oil in the bearing
would sustain it.Bronze is such a soft metal but did not know about it's
absorbency. That may possibly reduce any wear on the metal. I will try the
bronze. Thanks!
Also, any suggestions on what oil has worked best for you? I am going to
try some teflon based oil, but they are harder to come by where I live. I
do have an order for some and hope it will be here in a couple of weeks.
Thanks again
Randy
On Mon, Jan 28, 2013 at 10:56 AM, Ron L'Herault <[email protected]> wrote:
So why didn't you use something like sintered bronze for the bearing?
It
absorbs and holds oil.
Ronald L'Herault
Lab Supervisor, Biomaterials Division
B.U. School of Dental Medicine
801 Albany Street S203
Roxbury, MA 02119
-----Original Message-----
From: [email protected] [mailto:[email protected]]
On
Behalf Of Randy Larson
Sent: Monday, January 28, 2013 11:48 AM
To: Antique Phonograph List
Subject: [Phono-L] Edison Bearing
I want to thank everyone who expressed interest in the Edison bearing.
I've
received enough request that will keep me busy for several weeks. So I'm
sorry I can't make the offer free anymore.
One question is why make one in the first place?
A collector once said to me years ago; one of the problems with an Edison
motor is that there is steel on steel friction with only the oil you can
externally place on it. That in itself initiated the wheels spinning. I
wondered if I could improve it.
This bearing provides a continuous feed of oil to the bearing and reduce
the
constant need to oil it externally.
Maybe it's crazy and won't make a difference. But I'm sending it out to
several individuals to test it and see if it is an improvement.
Or maybe it's because I'm too lazy to oil the motor as required!
In 1963, I received my fathers Brunswick he played as a child. I was
thrilled with it and began my enthusiasm for collecting, He would take me
all over the city as I scoured for any old unit. In 1964, he paid $60 for
my
first Edison Standard (of which he only made $75 a week). I was stunned
that
he would make such a sacrifice for me.
What is interesting is that he worked for Alcoa Aluminum. He was an avid
inventor and came up with several improvements for the machines he
operated.
He was even recognized for several awards (unfortunately nothing
financially). He passed away in 2011 at the age of 91 He was my best
friend,
hero and my inspiration. And we both admired Edison!
Maybe a long explanation of why, but there it is.
Best Regards
Randy Larson
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