PSN-L Email List Message

From: "JAMES C. ALLEN" jcallen1@...........
Date: Fri, 11 Nov 2005 11:26:59 -0800

I just bid on and won three Teledyne Geotech Helicorder's model RV-301B, for 
which I am going to keep one and am willing to give the other two away. 
These units will require repair.  However, if you want one go to the EBay 
listing for item # 6223171283 which closed yesterday select either one or 
both of the two on the right side of your screen and let me know.  I will 
inform the company to release it (them) to you.  You just have to pay 
shipping which will run (in the USA) about $35.00 per unit.
James Allen
----- Original Message ----- 
From: "Wayne" 
Sent: Monday, November 07, 2005 8:57 AM
Subject: Re: low friction hinge discusson

> Subject: Re: low friction hinge discusson
>> Oh yes, one other point (pun intended) about points on surfaces, it would 
>> seem to me that mixing material is a good idea.  I belive I've heard that 
>> generally sliding surface bearings are better if the materials are 
>> different.
> Regarding this, I had heard that in addition to choosing materials with 
> low sliding friction, a second bearing material was often used for ease of 
> subsequent maintenance.  That is, if the same bearing material were used 
> for both surfaces, both bearing parts would wear away at pretty much the 
> same rate.  With differing materials having different wear rates, only one 
> half of of the bearing would need to be replaced.  This could be useful in 
> those circumstances where "half" of the bearing is more readily accesible, 
> but the other "half" is not.  Don't know if this wear/replacement business 
> has any bearing (pun intended) on seismo hinges, however.
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