[dsg-eic_dirc] Thoughts on metal brackets and number of latches

[Tyler Lemon]

 Hi Greg,

With the feedback from Matt, do we just want to go with wooden braces?

I do not think wood be the quickest in terms of when we’d receive the final items.
But, wooden braces have been proven to work well enough.

We’ll follow through on which ever option you and Beni decide on, so just let us know.

-Tyler




________________________________
From: Grzegorz Kalicy <gkalicy at jlab.org>
Sent: Wednesday, October 4, 2023 3:22:27 PM
To: Tyler Lemon <tlemon at jlab.org>; Benedikt Zihlmann <zihlmann at jlab.org>
Subject: Thoughts on metal brackets and number of latches

Hi Tyler and Beni,

I talked to Matt about two aspects we wondered about during the meeting, here are thoughts

1) The is an idea to make the brackets with foam that we used inside the inner basket to pin down the barbox out of aluminum:

It should work but wood would be better.  These things need to be attached to the inner crate with wood screws after the bar box is place.  It is easier to start a wood screw in a piece of wood then place the wood brace in the crate in the desired position and screw the screw the rest of the way through the wood into the crate.  If it is aluminum you have to position the piece in the crate then hold the screw over a drilled hole in the aluminum and try to screw into the crate.  It needs 3 hands:  one to hold the piece with foam in compression against the side of the bar box and 2 hands to start and drill the screw.  With wood, the screw is held by the wood.  So one hand holds the piece in the desired place and the other one screws the screw.   The aluminum should work fine,  it might just be a little clumsier and doing clumsy things above the bar box with tools and screws is not great.   But... it will work.  we should make sure you get foam adhesive that sticks to the aluminum.

  2) the top part of the inner basket was fixed with laches, can we use less:

The top part of the crate holds the brackets for the horizontal air spring.  So the goal of the top is transfer side to side motion of the inner crate to the air springs.  This happens fine as long as the top is tightly fitted into the recess that is visible in your photo.  Fewer latches is probably OK, but it might be desirable to position these latches around the horizontal air spring brackets.  What we don't want is the top to pop out and have the air springs only working on the top alone while the inner crate and bar box rock back and forth


Cheers,

Greg
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