HomeMy WebLinkAbout15-05-13 Item 6 - Cheyenne Update F��W PpRr
CITY OF
NEWPORT BEACH
�9�,FoaN'P Harbor Commission Staff Report Agenda Item No, 6
May 13, 2015
TO: HARBOR COMMISSION
FROM: Public Works Department
Chris Miller, Harbor Resources Manager
949-644-3043, cmiller@newportbeachca.gov
TITLE: Cheyenne 30-Day Update (May)
ABSTRACT:
Per the Harbor Commission's direction at the November 2014 meeting, the Commission will
review the 30-day update for the vessel Cheyenne as submitted by Mr. Chris Welsh.
RECOMMENDATION:
1. Receive and file.
FUNDING REQUIREMENTS:
There is no fiscal impact related to this item.
ENVIRONMENTAL REVIEW:
Staff recommends the Harbor Commission find this action is not subject to the California
Environmental Quality Act ("CEQA") pursuant to Sections 15060(c)(2) (the activity will not result
in a direct or reasonably foreseeable indirect physical change in the environment) and
15060(c)(3) (the activity is not a project as defined in Section 15378) of the CEQA Guidelines,
California Code of Regulations, Title 14, Chapter 3, because it has no potential for resulting in
physical change to the environment, directly or indirectly.
NOTICING:
The agenda item has been noticed according to the Brown Act (72 hours in advance of the
meeting at which the Harbor Commission considers the item).
Submitted by:
grate
Ch s Miller
Miller, Chris
From: Chris Welsh <fivedives@gmail.com>
Sent: Thursday, May 07, 2015 10:50 AM
To: Miller, Chris
Cc: David Girling
Subject: Cheyenne May Update
5/6/15 Visited the dome this AM in Arizona. The 24" diameter tool shown was curing after replacement of the
abrasive tiles. The dome material remains harder than they have experienced before. Normally, the tiles would
complete a whole telescope lens without having to be replaced, while on the dome,they are wearing out in two
to three days and then there are two down days while the replacement tiles cure onto the tool again. The work is
done by a combination of the tiles and pumice grit which is irrigated onto the tool while it is spinning at 70
RPM and the dome turntable is going around at one revolution every few minutes.
The current grit is equivalent to 120 sandpaper and there is 8-10 days more of this, then the grit will start to be
finer and finer to get to an optical polish. The dome will have to be moved into another room for the final
polish; the dome dust and heavy pumice in the air would contaminate the final optical polish process. The
optical polish will be ten days, followed by onsite QC to confirm the specifications and tolerances have been
met using finer thickness testers and a spherometer. The tolerances are+/- .005" on a part that is about 5"thick,
plus a host of sphericity specs.
Theolishin tool:
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Testin with the ultrasonic thickness tester:
The dome as of today.
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Netting it out,the dome should be turned over about June 2nd and then shipped to San Francisco to be united
with the sub components. Testing in Pennsylvania will follow, then final assembly of the sub and we are back in
the water. 4-5 months to accomplish all of that.
On a side note, we called Shellmaker Tuesday and volunteered to help with the barge removal using the cat's
lifting capabilities. The cat is longer and wider than the barge and could help by minimizing the amount of
cutting necessary to get pieces of the barge out. We also gave them several sources for buoyancy solutions to
solve that current problem. We will assist in any way we can. Much like our previous work removing the whale
carcass in San Diego, the cat has unusual capabilities.
Cheers,
Chris Welsh
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