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Re: [TowerTalk] Thrust bearings

To: <>
Subject: Re: [TowerTalk] Thrust bearings
From: "Jon Pearl - Laptop" <>
Date: Mon, 10 Oct 2011 07:40:32 -0400
List-post: <">>
I did exactly the same thing a few years back, Roger.  A buddy of mine who 
was a machinist in a plastics shop, acquired some Delrin plate scraps for me 
to use.  I roughly formed the pieces into a couple of 5"X5" squares and then 
drilled a small pilot hole through both pieces.  Dropping the drill bit down 
through both pieces to use as an indexing pin I rough cut both pieces as a 
unit into a fat donut and then finished the shaping with a band sander.  I 
finished by withdrawing the drill bit and cutting the appropriate sized mast 
holes in both.  Viola!  A solid state thrust bearing.


Jon Pearl - W4ABC

----- Original Message ----- 
From: "K8RI on TT" <>
To: <>
Sent: Monday, October 10, 2011 1:07 AM
Subject: Re: [TowerTalk] Thrust bearings

> On 10/10/2011 12:21 AM, Jim Lux wrote:
>> On 10/9/11 7:55 PM, Charlie Gallo wrote:
>>> Hey Gang,
>>> Reading the Nth thread on lubing thrust bearings, and just had a 
>>> thought - would it be a good idea to design a thrust bearing that works 
>>> based upon an 'ultra high molecularly weight filled self lubricating 
>>> plastic" (aka something like a filled teflon - or rulon or even 
>>> vespel) - nothing to ever rust/lubricate, and they can take decades of 
>>> low to medium speed rotation/sliding - heck, in theory, if your mast was 
>>> truly round, you could just have 3 or 4 pressure blocks, and it just 
>>> rides on that
> We used to use graphite impregnated Delrin for low speed bearings.  How
> much of a load they'd take I don't know, but they worked well and lasted
> long in our applications.
> 73
> Roger (K8RI)


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