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 Post subject: Foam Journal Box Pads
PostPosted: Fri Apr 14, 2017 2:04 pm 

Joined: Thu Jun 23, 2016 3:16 pm
Posts: 1
Anyone care to recommend a mechanically durable foam that wicks to saturation and will retain car oil against the axle journals in a 6x12 box. Unity Railway Supply can supply 6x11 pads but not 12" long pads. These might work but we would rather have plenty of lube right to the fillet and to the thrust end of the axle. I have heard that others successfully use a dense open cell foam that doesn't weaken and disintegrate in oil, retaining enough mechanical integrity to accommodate axle motion while being forced upward by some kind of spring cage.
A description, picture or sketch of the spring cage arrangement would be very helpful as well.

This is for the the plain boxes being installed in the Orange Empire Railway Museum's SP1006 (EMD, SW1, c.1939) restoration to 'as built' Truck reassembly in in progress.


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 Post subject: Re: Foam Journal Box Pads
PostPosted: Fri Apr 14, 2017 5:58 pm 

Joined: Wed Oct 13, 2004 12:56 am
Posts: 341
Location: Northern California
Since pads are no longer available you might want to consider just packing the box with hank wool. That is probably the "as built" condition. The only disadvantage to hank wool is the box will have less free oil in it and will need to be oiled every 100 miles instead of going 2000 miles between oiling. The hank wool will last longer than pads. You may have to rewind the hanks into ropes. There are a number of documents that illustrate the proper way to pack with hanks. It will have to be presoaked and will drained prior to packing.


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 Post subject: Re: Foam Journal Box Pads
PostPosted: Fri Apr 14, 2017 7:21 pm 

Joined: Wed Oct 31, 2007 10:40 am
Posts: 69
Location: Chama, NM
Another option might be Armstrong Oilers. They would be more expensive up front but might be worth it in the long run.


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 Post subject: Re: Foam Journal Box Pads
PostPosted: Fri Apr 14, 2017 7:57 pm 

Joined: Tue Sep 14, 2004 7:52 am
Posts: 1224
Location: Strasburg, PA
Use the 6" x 11" pads, they will be fine. As the journal rotates the oil up into the brass, it is squeezed to the ends of the brass as it wedges between the two surfaces, thoroughly lubricating the entire length of the bearing.

We have had lead truck journals where the pad contacts perhaps the middle 60% of the journal length with no troubles.

_________________
"It was not easy to convince Allnutt. All his shop training had given him a profound prejudice against inexact work, experimental work, hit-or-miss work."
C. S. Forester

Strasburg Rail Road Mechanical Department


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