[TowerTalk] Thrust Bearing for Use with Prop Pitch Rotor

[Stan Stockton]

Similar to what W7RY recommended but 2-1/8".  Last time I bought any they were 2-1/8" because of too tight fit on 2".  

https://www.thebigbearingstore.com/2-1-8-four-bolt-flange-bearing-w-lock-collar-hcfs211-34/

73... Stan, K5GO


On Mar 11, 2019, at 7:54 AM, Paul Christensen <w9ac at arrl.net> wrote:

>> So, many of this type of bearing will not work due to the tight tolerances. A mast that’s been galvanized usually will not fit.  73 de Steve, NR4M
> 
> Good point, Steve.  Two years ago, N4CC and I were 48 hours away from "crane day" when we tested the fit of a 3-inch galvanized chromoly mast into a 3" flange bearing.  The mast was approximately 1/16" wider than the ID of the bearing.  We placed an emergency order through DXE for a set of Rohn TB-4 bearings which has the necessary clearance.  
> 
> The TB-4 raceway design is terrible but they've been working fine for the last 24 months.  Had the DXE bearings been available, we would have chosen that design over the TB-4.
> 
> Paul, W9AC 
> 
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