[TowerTalk] Thrust Bearing
k6uj at pacbell.net
Sun Dec 27 12:13:54 EST 2020
Great minds think alike :-)
I have one similar to this one except it has a locking collar. 7K lbs axial
load rating, 10K lbs radial load rating.
> On Dec 27, 2020, at 2:59 AM, maflukey at gmail.com wrote:
> As an alternative suggestion.... I have been using flange mounted pillow
> block bearings as mast thrust bearings - first time was about 20 years ago.
> IMHO they are typically plenty strong - ratings are something like ~6500 lbs
> static radial load and ~ 2500 lbs of static axial load. Cost was about $35
> then, probably $50+ now, but they seem to last forever if you keep them
> pumped full of grease and protect them from the weather. For standard 2" OD
> structural steel mast I used 2-1/16" bore bearings. For 1.5" SCH 160 pipe
> masts I used 1-15/16" bore bearings. Recommend to confirm the mast OD by
> measurement with a mic or dial caliper, especially if you are using
> repurposed masts... For a weather shield I used silicone bellows type
> plumbing vent roof jack seals that I attached to the masts just above the
> bearings with an automotive worm clamp. The bottom of the bellows sat just
> high enough over the top plate of the tower so as not to rub but completely
> covered the bearing housing.... don't forget to slide the seal over the
> mast before you install it or you have to start over - hi. Also suggest to
> put a coat of paint on the mounting side of the bearing block or it will
> rust and/or interact with the galvanized top plate surface. My larger
> tower accepted the 4-bolt bearing flange by re-drilling the top plate but
> three smaller towers I had to fabricate adapter plates. I used 1/4" mild
> steel plate for the adapters. PS - pillow block bearings pivot in their
> housings so be sure to keep the bottom end of the mast restrained whenever
> it is disconnected from the rotor.
> 73 & Happy Holidays!
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