RE: ATM - Travel Scope

["Good, Donald" <dgood@aha.org>]

Once the PVC starts to bow out under the tension of the chain, you loose the
over-all stiffness of the tube structure, and it droops.  You need something
stiffer than PVC at the diameter and thickness you are using.  Try aluminum
tube.  There are sizes that fit inside each other (o.d. of one is nearly the
i.d of another) such that you can make couplings to segment the tube.  Make
sure the ends are as flat and perpendicular as possible, because once the
alignment is distorted by a crooked end, the bowing will start.  Use a
lathe, if you have access to one.

Nice design.  Good luck.

-----Original Message-----
From: Benjamin Robbins [mailto:benjaminr@highwire.com]
Sent: Monday, January 06, 2003 12:25 PM
To: 'Tom Krajci'; atm@shore.net
Subject: RE: ATM - Travel Scope



Tom,

We were planning on using cloth attached with Velcro to the secondary for
baffling...have you had any experience with that?

We are noticing some truss droop when the scope is in the horizontal
position, it does go outside of the 3 ring binder circle we have placed in
the center of the mirror.. Any ideas on corrective measures?

Thanks,
Benjamin

 -----Original Message-----
From: 	Tom Krajci [mailto:tkrajci@san.osd.mil] 
Sent:	Thursday, January 02, 2003 3:53 AM
To:	atm@shore.net
Subject:	RE: ATM - Travel Scope


>From: Benjamin Robbins <benjaminr@highwire.com>

>Wanted to get feedback and give you an update on the travel scopes that
we
>have been working on over the last few months. They are both 10"
mirrors
>f-5.5. they are designed to fit into a regulation size carry on
luggage.
>http://home.earthlink.net/~benjaminr/MirrorImages/TwinScopes/TwinScopes
.htm

Looks good so far!

Two questions:

1.  What kind of baffling of the upper ring did you plan to use?

2.  Have you measured the amount of truss 'droop' at the scope moves
from vertical to horizontal?...does this amount of truss droop visibly
spoil collimation?

Thanks in advance,
Tom Krajci
Tashkent, Uzbekistan


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