Bruce Ferratt wrote:
> Hello and thank you for letting me post a few questions.
> Can someone tell me if a Rohn TB-3 thrust bearing will close/clamp down on a
> 1 1/4" aluminum mast pipe?
Well, I would never use an aluminum mast for rotating ANYthing, but
that's your choice.
I don't think the TB-3 will go down to 1-1/4" mast with the stock set
screws. When the ends of my set screws are flush with the 2" interior
wall of the thrust bearing, they have no more than another 1/4" of
possible travel before the head of the set screw hits the exterior
wall. If I drew my picture of your mast in a TB-3 properly, you will
need an absolute minimum of 3/8" travel for all three set screws, which
is 50% more than the set screws on my TB-3 will allow.
Now, it's possible that Rohn has changed the length of the set screws
over the years, but that's the size of the ones on my old TB-3.
In addition, since you specified aluminum, you'll need even longer set
screws because your set screws will probably go INTO the mast a little
bit....and a little bit....and a little bit....
Bud, W2RU
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