Thursday, March 21, 2013

Band saw: Babbitt bearings


About a year ago we purchased a 32 inch band saw made by The Sliver Manufacturing Company of Salem, Ohio.  Since then we have slowly been addressing it's refurbishment.
We think it is from about 1905.
Last year we thoroughly cleaned, sanded and painted the cast iron saw.
Although it had been sitting outside for years, it had very little rust.  Apparently cast iron, unlike steel, forms surface oxidation and stops deteriorating. Steel rots like warm ice unless protected.
We recently purchased a 2 horse 240v motor.
Yesterday we received v belts we ordered from VBeltsupply.com.
It took twin 102 inch belts riding on a sheave we picked up in Alton.
Before running the motor we took the Babbitt bearings apart and cleaned out very old saw dust.
The Babbitt bearings are such a simple and impressive design.
The axle sits in a lead bed set in a heavy cast iron arm.  The two cap pieces have an oil reservoir on top.  Holes in the castings and hand cut channels in the lead let the oil flow through to the large bearing surface of the lead.

We cleaned it all up, reassembled the bearing and fired up the motor.  It spins quietly and gives off the the impression of great mass.

Next we will service the upper wheel.

Here are photos of the process.




Lead lined bearing casting showing oil channels. 
  

There are two of these, one on each side of the shaft.


Looking straight down on the assembly.  You can see the reservoir. 


With the caps removed, the shaft can now be lifted out for cleaning.

The shaft set aside for cleaning.  Both the drive wheel and blade wheel are still attached.



Spinning up to speed.  Keep the kids away!




2 comments:

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Edwin S. Lee said...
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