Bell Jar not laying flat in the BACK

Eric Perozziello eap at gloworm.Stanford.EDU
Fri Sep 14 23:28:25 PDT 2007

Just a quick but urgent safety note here:  I'm not sure if
I understand the instructions (maybe I misinterpret it), but I
would highly advise AGAINST bringing down the bell jar by
having one person hold the two "DOWN" buttons while someone else
puts their hands on the bell jar!   There are several non-
obvious pinch points and suprisingly large forces involved.

There is a very good reason why there are TWO buttons required
to lower the bell jar-  To eliminate the temptation
of an operator putting one free hand on the moving bell jar!

Having painfully lost a fingernail, and almost my whole finger
doing something stupid like this, I am now a little smarter and
still have all 10 fingers.    :^)

-Eric (not "lefty")

On Fri, 14 Sep 2007, Jeannie Perez wrote:

> Hi Everyone,
> The Bell Jar on Innotec when bring down and checking the rear end of
> the Bell Jar is slightly up. The ATM light will NOT go out. To get by
> with this problem until Jim Haydon has a chance to look at it on
> Monday, you'll have to help press down on the back end of the Bell
> Jar ( about a foot before it's all the way down) and check again. If
> it isn't all the way down bring Bell Jar back up two feet high and
> apply pressure until it's down. This means you'll need two persons
> bring down the Bell Jar.
> The other person Pushing the two down buttons in front.  That person
> shouldn't release the down buttons for at least ten
> seconds after you think the bell Jar is down.
> Jeannie Perez
> Science and Engineering Technician
> Stanford Nanofabrication Facility
> Stanford University
> Tel: (650) 723-7997
> Fax: (650) 725-6278

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