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 AA05276; Mon, 19 Jun 1995 17:40:57 -0700 Return-Path: <James.Paugh@Eng.Sun.COM-DeleteThis> Received: from venus.Sun.COM by hplms26.hpl.hp.com with ESMTP ($Revision: 1.36.108.11 $/15.5+ECS 3.3+HPL1.1S) id AA138228862; Mon, 19 Jun 1995 17:41:02 -0700 Received: from Eng.Sun.COM by venus.Sun.COM (Sun.COM) id RAA01054; Mon, 19 Jun 1995 17:30:46 -0700 Received: from jurassic.Eng.Sun.COM (jurassic-52.Eng.Sun.COM) by Eng.Sun.COM (5.x/SMI-5.3) id AA29029; Mon, 19 Jun 1995 17:30:43 -0700 Received: from jalama.Eng.Sun.COM by jurassic.Eng.Sun.COM (SMI-8.6/SMI-SVR4) id RAA18463; Mon, 19 Jun 1995 17:30:37 -0700 Received: by jalama.Eng.Sun.COM (SMI-8.6.9/SMI-SVR4) id RAA17662; Mon, 19 Jun 1995 17:31:10 -0700 Date: Mon, 19 Jun 1995 17:31:10 -0700 From: James.Paugh@Eng.Sun.COM-DeleteThis (Jim Paugh) Message-Id: <199506200031.RAA17662@jalama.Eng.Sun.COM-DeleteThis> To: wind_talk@opus.hpl.hp.com-DeleteThis Subject: Re: Danger with Chinook bases--bolts loosen X-Sun-Charset: US-ASCII
> 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).
~Jim
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