Received: from hplms26.hpl.hp.com by opus.hpl.hp.com with SMTP (1.37.109.8/15.5+ECS 3.3+HPL1.1) id AA00144; Tue, 20 Jun 1995 07:24:17 -0700 Return-Path: <justin@booza.mcm.com-DeleteThis> Received: from netcomsv.netcom.com ([163.179.3.2]) by hplms26.hpl.hp.com with ESMTP ($Revision: 1.36.108.11 $/15.5+ECS 3.3+HPL1.1S) id AA202128267; Tue, 20 Jun 1995 07:24:28 -0700 Received: by netcomsv.netcom.com with UUCP (8.6.12/SMI-4.1) id HAA02309; Tue, 20 Jun 1995 07:11:50 -0700 Received: from crenshawu.mcm.com by guava.mcm.com (5.x/SMI-4.1) id AA01185; Tue, 20 Jun 1995 07:07:06 -0700 Received: from booza.mcm.com by crenshawu.mcm.com (5.x/SMI-SVR4) id AA04783; Tue, 20 Jun 1995 07:07:06 -0700 Received: by booza.mcm.com (5.x/SMI-SVR4) id AA00758; Tue, 20 Jun 1995 07:07:05 -0700 Date: Tue, 20 Jun 1995 07:07:05 -0700 From: justin@booza.mcm.com-DeleteThis (Justin Gordon) Message-Id: <9506201407.AA00758@booza.mcm.com-DeleteThis> X-Host-Id: booza To: wind_talk@opus.hpl.hp.com-DeleteThis Subject: Re: Danger with Chinook bases--bolts loosen X-Sun-Charset: US-ASCII
Jim,
Why don't you want base cup tight? Mine is very tight and still rotates
at the bottom.
> > another danger - over time the hole in the bottom of the cup will ovalize
> > and allow the bolt holding it to the rubber joint to pull through.
> >
> > you can get more thread pressure on the bolt and hourglass by putting a
> > small BB or other non-deformable object in the bottom of the hourglass
> > thread hole so that the bolt has something to "bottom out" against as you
> > tighten it. ^^^^^^^^^^
> ||||||||||
> This is probably the most critical point about servicing hour glass type
> universals. The bolt *must* bottom out in the hour glass, *without* making
> the base cup too tight *or* too loose. There should be no slop, but the cup
> should still be able to rotate. Bottoming out the bolt (combined with Locktite)
> will ensure that it will not loosen. The bolt head pulling through the cup
> can be prevented by using a stainless washer inside the cup.
>
> If the cup is loose and sloppy when the bolt is tightly bottomed out, add a
> washer to take up some of the length. Paul's idea is very good, about using
> a BB or ball bearing in the hour glass hole to bottom out a bolt that is a
> bit too short (i.e. the cup won't rotate when the bolt is tighted down).
Justin
-----------------------------
Justin Gordon
email: justin@mcm.com-DeleteThis
phone: 415.267.1287
Mellon Capital Management
595 Market Street, #3000
San Francisco, CA 94105
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