[TowerTalk] [Bulk] Re: [Bulk] Thrust Bearings

[Jon Pearl - W4ABC]

Hi Grant,

Here are a few sites that I keep on tap that others may find of interest:

http://www.boatoutfitters.com/cut-to-size-white-white-king-starboard
http://www.tapplastics.com/product/plastics/cut_to_size_plastic/king_starboard/526
https://www.interstateplastics.com/Uhmw-Natural-Virgin-Sheet-UHMNV~~SH.php?vid=201312282312-9p
http://www.mcmaster.com/#uhmw-polyethylene-sheets/=zmvqqd




Jon Pearl - W4ABC



On 11/1/2015 9:16 PM, Grant Saviers wrote:
> Agree. Rulon and TFE filled or plain polyamides (e.g. Vespel) are 
> indeed "crazy expensive" and not at all needed for radial or thrust. 
> UHMW is a small fraction of their costs and works just fine at the 
> PV's (pressure x velocity) that is found in tower/mast rotation 
> systems.  UHMW will creep more but that makes little difference in a 
> tower thrust or radial bearing.  My 3" x 22' mast thrust + radial 
> bearing is a 5" diameter 1/4" SS disk screwed with flat head screws to 
> an aluminum sleeve with 8 grub screws to secure it to the mast.  The 
> disk rests on a 6x6x4" UHMW block bored 3.040" for a 3" mast.  I think 
> the parts cost was $50 for UHMW, plus $40 for the 6061 and SS and 
> bolts (I did the machining).
>
> I designed a 10.5' tall swing arm assembly for mounting two large 
> yagis and it has a UHMW bearing as I described at the top but then 
> decided to use individual ring rotators.
>
> Grant KZ1W
>


---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus