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40m
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| 40m Log |
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 Wed Sep 26 17:09:15 2012, Den, Update, SUS, TT
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 Thu Sep 27 15:21:04 2012, Steve, Update, SUS, TT height adaptor & PTICH damping 
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Fri Oct 12 10:39:45 2012, Steve, Update, SUS, TT PITCH damping
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Fri Oct 12 14:01:33 2012, Koji, Update, SUS, TT PITCH damping
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Fri Oct 12 16:59:26 2012, steve, Update, SUS, TT PITCH damping
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Wed Oct 17 08:30:49 2012, Steve, Update, SUS, PTICH damping needed
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Wed Oct 17 11:15:05 2012, Den, Update, SUS, PITCH damping needed
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Thu Oct 18 02:42:38 2012, Den, Update, SUS, PITCH damping needed 7x
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Fri Oct 19 18:30:07 2012, Den, Update, SUS, PITCH damping needed
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Sat Oct 20 01:23:56 2012, Den, Update, SUS, PITCH damping needed
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Sat Oct 20 20:37:55 2012, Den, Update, SUS, PITCH damping needed
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Mon Oct 22 11:26:12 2012, rana, Update, SUS, PITCH damping needed
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Tue Oct 23 01:46:53 2012, Den, Update, SUS, PITCH damping needed
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Tue Oct 23 17:12:30 2012, Den, Update, SUS, PITCH damping needed
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Wed Oct 24 01:02:10 2012, Koji, Update, SUS, PITCH damping needed
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Mon Oct 29 18:14:55 2012, Den, Update, SUS, PITCH damping needed
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Tue Oct 23 18:18:29 2012, Jenne, Update, SUS, PITCH damping needed
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Message ID: 7593
Entry time: Tue Oct 23 01:46:53 2012
In reply to: 7588
Reply to this: 7598
7602
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| Author: |
Den |
| Type: |
Update |
| Category: |
SUS |
| Subject: |
PITCH damping needed |
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| Quote: |
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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.
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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. |
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