40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Fri Feb 19 15:17:51 2021, Jordan, Update, SUS, CoM Range on 3"->2" Adapter Ring for SOS Neutral_Point.pngDumbell_Max_Negative_Travel.pngDumbell_Max_Positive_Travel.png
    Reply  Fri Feb 19 16:06:01 2021, Koji, Update, SUS, CoM Range on 3"->2" Adapter Ring for SOS 
       Reply  Fri Feb 19 16:14:16 2021, gautam, Update, SUS, CoM Range on 3"->2" Adapter Ring for SOS 
          Reply  Fri Feb 19 16:55:26 2021, Koji, Update, SUS, CoM Range on 3"->2" Adapter Ring for SOS 
Message ID: 15823     Entry time: Fri Feb 19 15:17:51 2021     Reply to this: 15824
Author: Jordan 
Type: Update 
Category: SUS 
Subject: CoM Range on 3"->2" Adapter Ring for SOS 

Adjusting the thickness of the cylindrical hole for the mirror on the 2" optic sleeve, from .6875" to .61" thick, moves the CoM to 0.0003" out of plane from the suspension wire. This is with the dumbell at its neutral point.

How close to zero do we need this to be? More fine tuning of that thickness can get it to zero, but this would require much tighter machining tolerance on that hole depth.

Moving the dumbell towards the back of the SOS assembly (noted as negative direction, with origin at the plane formed by the wires), moves the CoM to -0.002" from the plane.

Moving the dumbell towards the front of the SoS assmebly (positive direction wrt the plane formed by the suspension wire), moves the CoM to +0.0022" from the plane.

So the total adjustment range with the dumbell is -0.002"to 0.0022", with the plane formed by the wires as the origin.

See Attachments

Attachment 1: Neutral_Point.png  922 kB  | Hide | Hide all
Neutral_Point.png
Attachment 2: Dumbell_Max_Negative_Travel.png  746 kB  | Hide | Hide all
Dumbell_Max_Negative_Travel.png
Attachment 3: Dumbell_Max_Positive_Travel.png  817 kB  | Hide | Hide all
Dumbell_Max_Positive_Travel.png
ELOG V3.1.3-