Rulon bearings, seals for 3/16" shaft

[Guest]

Dave,
Where do you get your Rulon bearings? Can they also supply seals that can act as bearings?

[bigdave]

Hi Art,
I get them

Hi Art,
I get them from Mcmaster. They are only bearings not seals too. BD.

[JWLaRue]

Definitely good material! I'll never

Definitely good material! I'll never use anything other than Rulon for prop shaft bearings.

I too get them from McMaster-Carr.

-Jeff

[scott t]

Are these the bearings you

Are these the bearings you are talking of?

http://www.mcmaster.com/ctlg/DisplCtlgPage.asp?ReqTyp=CATALOG&CtlgPgNbr=1037&RelatedCtlgPgs

Scott

[bigdave]

Yes, Rulon J. BD.

Yes, Rulon J. BD.

[JWLaRue]

Don't forget to look into

Don't forget to look into the flanged bearings as well.....those are the ones that I like to use.

-Jeff

[PaulC]

So what's the advantage over

So what's the advantage over the bronze oilite bearings -- weight?

[bigdave]

That is a good question!


That is a good question!
Jim Butt turned me on to them. He uses them at work as well as in his subs because they do not wear out. They are smaller in size that most oilite bearings and I guess weight could be a factor. They have a great I guess you could call it slip factor. It is hard to pick them up without them slipping out of your fingers. Meaning less drag on the shaft. BD.

[JWLaRue]

The Rulon bearings impart far

The Rulon bearings impart far less friction on the shaft. They also do not require any oiling for maintenance.

-Jeff

[bigdave]

Here is one mounted in

Here is one mounted in the stern of my Seawolf. It is 1/8" ID. BD.

[PaulC]

Don't wear out, less friction,

Don't wear out, less friction, no maintenance....sold!

[petn7]

Can the rulon bearings be

Can the rulon bearings be glued to the hull? Or will glue (like CA or epoxy) not stick to the rulon material? I ask this because I noticed from Dave's picture than the rulon was surrounded by what appears to be brass tubing.

[bigdave]

I don't believe anything will

I don't believe anything will stick to the Rulon. I just mounted the brass tube as a fixture to hold the bearing in place. The bearing has a .250 OD so the .250 ID K&S worked great. I have the next smaller size of tube inside that the bearing rests on. This sets the correct depth so a little of the bearing is showing to act as a surface for the impeller to ride on. BD.

[JWLaRue]

One way to get a

One way to get a Rulon bearing to stay in place is to machine a groove around the outside, then glue (e.g. epoxy or CA) it into place. The groove will fill the glue and hold it into place.

What I do is to machine the hole so that it is a tight fit. Press the bearing in and you're done.

-Jeff

[Guest]

Another bearing containing PTFE is

Another bearing containing PTFE is DU(B). These are bronze bearings impregnated with PTFE, they are lubricated with water, and can be pressed in or held with a dab of loctite.

Norbert Brueggen supplies these, and they're also available from BSL Brammer (UK distributer, don't know about the U.S).

http://www.modelluboot.de/Zubehoer/Dichtungen.html#WDR

http://www.dynametal.co.th/dry_du.htm

http://www.brammer.biz/uk.aspx

Andy