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Message ID: 15929     Entry time: Wed Mar 17 10:52:48 2021
Author: Jordan 
Type: Update 
Category: SUS 
Subject: 3" Ring Adpater for SOS  

I have added a .1", 45deg chamfer to the bottom of the adapter ring. This was added for a new placement of the eq stops, since the barrel screws are hard to access/adjust.

This also required a modification to the eq stop bracket, D960008-v2, with 1/4-20 screws angled at 45 deg to line up with the chamfer.

The issue I am running into is there needs to be a screw on the backside of the ring as well, otherwise the ring would fall backwards into the OSEMs in the event of an earthquake. The only two points of contact are these front two angled screws, a third is needed on the opposite side of the CoM for stability. This would require another bracket mounted at the back of the SOS tower, but there is very little open real estate because of the OSEMs.

 

Instead of this whole chamfer route, is it possible/easier to just swap the screws for the barrel eq stops? Instead of a socket head cap screw, a SS thumb screw such as this, will provide more torque when turning, and remove the need to use a hex wrench to turn.

 

Attachment 1: Side_View.png  758 kB  Uploaded Wed Mar 17 12:23:15 2021  | Hide | Hide all
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Attachment 2: Front_View.png  673 kB  Uploaded Wed Mar 17 12:23:15 2021  | Hide | Hide all
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Attachment 3: Ring_with_Modifed_Bracket.png  858 kB  Uploaded Wed Mar 17 12:23:15 2021  | Hide | Hide all
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Attachment 4: Back_of_ring.png  676 kB  Uploaded Wed Mar 17 12:23:15 2021  | Hide | Hide all
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Attachment 5: Front_of_Ring.png  585 kB  Uploaded Wed Mar 17 12:23:15 2021  | Hide | Hide all
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