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Entry  Wed Sep 26 17:09:15 2012, Den, Update, SUS, TT 
    Reply  Thu Sep 27 15:21:04 2012, Steve, Update, SUS, TT height adaptor & PTICH damping 09271201.PDFIMG_1656.JPGIMG_1654.JPG
       Reply  Fri Oct 12 10:39:45 2012, Steve, Update, SUS, TT PITCH damping IMG_1709.JPG
          Reply  Fri Oct 12 14:01:33 2012, Koji, Update, SUS, TT PITCH damping 
             Reply  Fri Oct 12 16:59:26 2012, steve, Update, SUS, TT PITCH damping 
       Reply  Wed Oct 17 08:30:49 2012, Steve, Update, SUS, PTICH damping needed 
          Reply  Wed Oct 17 11:15:05 2012, Den, Update, SUS, PITCH damping needed pitch_damping.png
             Reply  Thu Oct 18 02:42:38 2012, Den, Update, SUS, PITCH damping needed 7x
                Reply  Fri Oct 19 18:30:07 2012, Den, Update, SUS, PITCH damping needed damp.pngpitch.png
                   Reply  Sat Oct 20 01:23:56 2012, Den, Update, SUS, PITCH damping needed P1010059.jpgP1010058.jpgP1010060.jpg
                      Reply  Sat Oct 20 20:37:55 2012, Den, Update, SUS, PITCH damping needed DSC_4778.JPGpitch.JPGyaw.JPGDSC_4776.JPG
                      Reply  Mon Oct 22 11:26:12 2012, rana, Update, SUS, PITCH damping needed 
                         Reply  Tue Oct 23 01:46:53 2012, Den, Update, SUS, PITCH damping needed Mirror_Holder_ECD_NEW_DRAWING.PDFTT_DAMPING_DRAWING.PDF
                            Reply  Tue Oct 23 17:12:30 2012, Den, Update, SUS, PITCH damping needed simple_drawing.PDF
                               Reply  Wed Oct 24 01:02:10 2012, Koji, Update, SUS, PITCH damping needed 
                                  Reply  Mon Oct 29 18:14:55 2012, Den, Update, SUS, PITCH damping needed DSC_4787.JPGDSC_4791.JPG
                            Reply  Tue Oct 23 18:18:29 2012, Jenne, Update, SUS, PITCH damping needed 
Message ID: 7602     Entry time: Tue Oct 23 18:18:29 2012     In reply to: 7593
Author: Jenne 
Type: Update 
Category: SUS 
Subject: PITCH damping needed 

Quote:

Quote:

 

Too bad - I thought it would at least give a little damping. Since we want the viscous-like energy loss to be ~49x larger, we need to have the field modulation in the damper (not dumper) increase by ~7.

 I've made SolidWorks models of damping bracket and eddy current disk. They will me manufactured and used instead of old ones. New bracket will be mounted in exactly the same place where the old one was. Drawings might not be complete but all dimensions are in the models so we can fix drawing tomorrow before going to machine shop.

I think we can use ring magnets for passive damping. Then we won't have the vent problem. I've found some at K&J Magnetics, we can get them any time. Magnets are Ni-Cu-Ni (fine for vacuum?) Diameter is 3/8'' with advertised tolerence 0.004'', so they should fit the holes.

 Den mentioned that the disks will have threaded holes, and that he has made a note to that effect on the paper copy of the drawing that he will bring to Mike at the shop.  Also, all threaded holes in the new plate are marked on the paper copy.

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