[ROVERNET - UK] P6B Sticking Handbrake

[Paul Smith]

That's close to bad physics... the holes enlarge if the whole sheet is
warmed.  Localised cooling could be different.

PVS

-----Original Message-----
From: JOHN HALL [mailto:J.HALL11 at COMCAST.NET]
Sent: Tuesday, 23 November 2004 11:29 am
To: rovernet at lyris.ccdata.com
Subject: Re: [ROVERNET - UK] P6B Sticking Handbrake


What I meant was that a hole in metal would enlarge when cooled. At JPL we
enclosed electronic devices in 1/4" AL chassis. Had to have sealed terminals
for external connections. We drilled holes in the chassis. Packed in dry
ice, then inserted the terminals in the holes. When the chassis warmed up
the holes contracted and made a very tight seal.



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